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=head1 NAME |
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|
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gvpe.conf - configuration file for the GNU VPE daemon |
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|
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=head1 SYNOPSIS |
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|
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udp-port = 407 |
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mtu = 1492 |
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ifname = vpn0 |
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|
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node = branch1 |
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hostname = 1.2.3.4 |
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|
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node = branch2 |
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hostname = www.example.net |
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udp-port = 500 # this host uses a different udp-port |
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|
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node = branch3 |
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connect = ondemand |
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|
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=head1 DESCRIPTION |
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|
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The gvpe config file consists of a series of lines that contain C<variable |
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= value> pairs. Empty lines are ignored. Comments start with a C<#> and |
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extend to the end of the line. They can be used on their own lines, or |
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after any directives. Spaces are allowed before or after the C<=> sign or |
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after values, but not within the variable names or values themselves. |
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|
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The only exception to the above is the "on" directive that can prefix any |
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C<name = value> setting and will only "execute" it on the named node, or |
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(if the nodename starts with "!") on all nodes except the named one. |
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|
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name = value |
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on branch1 loglevel = noise |
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on !branch2 connect = ondemand |
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|
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All settings are executed "in order", that is, later settings of the same |
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variable overwrite earlier ones. |
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|
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=head1 ANATOMY OF A CONFIG FILE |
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|
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Usually, a config file starts with global settings (like the udp port to |
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listen on), followed by node-specific sections that begin with a C<node = |
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nickname> line. |
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|
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Every node that is part of the network must have a section that starts |
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with C<node = nickname>. The number and order of the nodes is important |
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and must be the same on all hosts. It is not uncommon for node sections to |
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be completely empty - if the default values are right. |
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|
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Node-specific settings can be used at any time. If used before the first |
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node section they will set the default values for all following nodes. |
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|
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=head1 CONFIG VARIABLES |
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|
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=head2 GLOBAL SETTINGS |
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|
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Global settings will affect the behaviour of the running gvpe daemon, that |
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is, they are in some sense node-specific (config files can set different |
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values on different nodes using C<on>), but will affect the behaviour of |
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the gvpe daemon and all connections it creates. |
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|
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=over 4 |
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|
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=item dns-forw-host = hostname/ip |
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|
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The dns server to forward dns requests to for the DNS tunnel protocol |
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(default: C<127.0.0.1>, changing it is highly recommended). |
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|
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=item dns-forw-port = port-number |
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|
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The port where the C<dns-forw-host> is to be contacted (default: C<53>, |
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which is fine in most cases). |
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|
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=item dns-max-outstanding = integer-number-of-requests |
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|
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The maximum number of outstanding DNS transport requests |
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(default: C<100>). GVPE will never issue more requests then the given |
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limit without receiving replies. In heavily overloaded situations it might |
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help to set this to a low number (e.g. C<3> or even C<1>) to limit the |
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number of parallel requests. |
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|
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The default should be working ok for most links. |
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|
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=item dns-overlap-factor = float |
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|
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The DNS transport uses the minimum request latency (B<min_latency>) seen |
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during a connection as it's timing base. This factor (default: C<0.5>, |
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must be > 0) is multiplied by B<min_latency> to get the maximum sending |
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rate (= minimum send interval), i.e. a factor of C<1> means that a new |
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request might be generated every B<min_latency> seconds, which means on |
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average there should only ever be one outstanding request. A factor of |
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C<0.5> means that GVPE will send requests twice as often as the minimum |
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latency measured. |
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|
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For congested or picky dns forwarders you could use a value nearer to or |
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exceeding C<1>. |
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|
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The default should be working ok for most links. |
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|
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=item dns-send-interval = send-interval-in-seconds |
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|
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The minimum send interval (= maximum rate) that the DNS transport will |
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use to send new DNS requests. GVPE will not exceed this rate even when |
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the latency is very low. The default is C<0.01>, which means GVPE will |
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not send more than 100 DNS requests per connection per second. For |
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high-bandwidth links you could go lower, e.g. to C<0.001> or so. For |
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congested or rate-limited links, you might want to go higher, say C<0.1>, |
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C<0.2> or even higher. |
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|
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The default should be working ok for most links. |
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|
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=item dns-timeout-factor = float |
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|
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Factor to multiply the C<min_latency> (see C<dns-overlap-factor>) by to |
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get request timeouts. The default of C<8> means that the DNS transport |
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will resend the request when no reply has been received for longer than |
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eight times the minimum (= expected) latency, assuming the request or |
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reply has been lost. |
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|
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For congested links a higher value might be necessary (e.g. C<30>). If the |
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link is very stable lower values (e.g. C<2>) might work nicely. Values |
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near or below C<1> makes no sense whatsoever. |
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|
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The default should be working ok for most links. |
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|
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=item if-up = relative-or-absolute-path |
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|
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Sets the path of a script that should be called immediately after the |
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network interface is initialized (but not neccessarily up). The following |
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environment variables are passed to it (the values are just examples): |
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|
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=over 4 |
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|
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=item CONFBASE=/etc/gvpe |
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|
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The configuration base directory. |
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|
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=item IFNAME=vpn0 |
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|
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The interface to initialize. |
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|
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=item MTU=1436 |
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|
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The MTU to set the interface to. You can use lower values (if done |
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consistently on all hosts), but this is usually ineffective. |
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|
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=item MAC=fe:fd:80:00:00:01 |
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|
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The MAC address to set the interface to. The script *must* set the |
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interface MAC to this value. You will most likely use one of these: |
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|
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ip link set $IFNAME address $MAC mtu $MTU up # GNU/Linux |
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ifconfig $IFNAME ether $MAC mtu $MTU up # FreeBSD |
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|
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Please see the C<gvpe.osdep(5)> manpage for platform-specific information. |
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|
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=item IFTYPE=native # or tincd |
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|
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=item IFSUBTYPE=linux # or freebsd, darwin etc.. |
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|
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The interface type (C<native> or C<tincd>) and the subtype (usually the os |
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name in lowercase) that this gvpe was configured for. Can be used to select |
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the correct syntax to use for network-related commands. |
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|
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=item NODENAME=branch1 |
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|
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The nickname of the current node, as passed to the gvpe daemon. |
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|
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=item NODEID=1 |
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|
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The numerical node id of the current node. The first node mentioned in the |
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config file gets ID 1, the second ID 2 and so on. |
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|
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=back |
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|
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Here is a simple if-up script: |
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|
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#!/bin/sh |
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ip link set $IFNAME address $MAC mtu $MTU up |
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[ $NODENAME = branch1 ] && ip addr add 10.0.0.1 dev $IFNAME |
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[ $NODENAME = branch2 ] && ip addr add 10.1.0.1 dev $IFNAME |
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ip route add 10.0.0.0/8 dev $IFNAME |
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|
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More complicated examples (using routing to reduce arp traffic) can be |
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found in the etc/ subdirectory of the distribution. |
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|
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=item ifname = devname |
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|
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Sets the tun interface name to the given name. The default is OS-specific |
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and most probably something like C<tun0>. |
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|
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=item ifpersist = yes|true|on | no|false|off |
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|
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Should the tun/tap device be made persistent, that is, should the device |
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stay up even when gvpe exits? Some versions of the tunnel device have |
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problems sending packets when gvpe is restarted in persistent mode, so |
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if the connections can be established but you cannot send packets from |
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the local node, try to set this to C<off> and do an ifconfig down on the |
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device. |
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|
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=item ip-proto = numerical-ip-protocol |
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|
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Sets the protocol number to be used for the rawip protocol. This is a |
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global option because all hosts must use the same protocol, and since |
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there are no port numbers, you cannot easily run more than one gvpe |
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instance using the same protocol, nor can you share the protocol with |
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other programs. |
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|
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The default is 47 (GRE), which has a good chance of tunneling through |
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firewalls (but note that the rawip protocol is not GRE compatible). Other |
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common choices are 50 (IPSEC, ESP), 51 (IPSEC, AH), 4 (IPIP tunnels) or 98 |
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(ENCAP, rfc1241) |
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|
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=item http-proxy-host = hostname/ip |
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|
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The C<http-proxy-*> family of options are only available if gvpe was |
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compiled with the C<--enable-http-proxy> option and enable tunneling of |
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tcp connections through a http proxy server. |
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|
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C<http-proxy-host> and C<http-proxy-port> should specify the hostname and |
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port number of the proxy server. See C<http-proxy-loginpw> if your proxy |
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requires authentication. |
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|
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Please note that gvpe will still try to resolve all hostnames in the |
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configuration file, so if you are behind a proxy without access to a dns |
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server better use numerical IP addresses. |
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|
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To make best use of this option disable all protocols except tcp in your |
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config file and make sure your routers (or all other hosts) are listening |
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on a port that the proxy allows (443, https, is a common choice). |
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|
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If you have a router, connecting to it will suffice. Otherwise tcp must be |
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enabled on all hosts. |
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|
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Example: |
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|
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http-proxy-host = proxy.example.com |
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http-proxy-port = 3128 # 8080 is another common choice |
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http-proxy-auth = schmorp:grumbeere |
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|
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=item http-proxy-port = proxy-tcp-port |
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|
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The port where your proxy server listens. |
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|
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=item http-proxy-auth = login:password |
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|
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The optional login and password used to authenticate to the proxy server, |
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seperated by a literal colon (C<:>). Only basic authentication is |
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currently supported. |
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|
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=item keepalive = seconds |
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|
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Sets the keepalive probe interval in seconds (default: C<60>). After this |
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many seconds of inactivity the daemon will start to send keepalive probe |
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every 5 seconds until it receives a reply from the other end. If no reply |
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is received within 30 seconds, the peer is considered unreachable and the |
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connection is closed. |
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|
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=item loglevel = noise|trace|debug|info|notice|warn|error|critical |
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|
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Set the logging level. Connection established messages are logged at level |
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C<info>, notable errors are logged with C<error>. Default is C<info>. |
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|
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=item mtu = bytes |
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|
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Sets the maximum MTU that should be used on outgoing packets (basically |
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the MTU of the outgoing interface) The daemon will automatically calculate |
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maximum overhead (e.g. udp header size, encryption blocksize...) and pass |
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this information to the C<if-up> script. |
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|
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Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
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|
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This value must be the minimum of the mtu values of all hosts. |
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|
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=item node = nickname |
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|
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Not really a config setting but introduces a node section. The nickname is |
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used to select the right configuration section and must be passed as an |
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argument to the gvpe daemon. |
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|
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=item node-up = relative-or-absolute-path |
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|
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Sets a command (default: no script) that should be called whenever a |
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connection is established (even on rekeying operations). In addition |
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to the variables passed to C<if-up> scripts, the following environment |
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variables will be set: |
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|
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=over 4 |
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|
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=item DESTNODE=branch2 |
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|
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The name of the remote node. |
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|
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=item DESTID=2 |
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|
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The node id of the remote node. |
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|
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=item DESTIP=188.13.66.8 |
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|
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The numerical IP address of the remote host (gvpe accepts connections from |
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everywhere, as long as the other host can authenticate itself). |
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|
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=item DESTPORT=655 # deprecated |
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|
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The UDP port used by the other side. |
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|
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=item STATE=UP |
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|
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Node-up scripts get called with STATE=UP, node-down scripts get called |
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with STATE=DOWN. |
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|
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=back |
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|
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Here is a nontrivial example that uses nsupdate to update the name => ip |
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mapping in some dns zone: |
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|
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#!/bin/sh |
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{ |
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echo update delete $DESTNODE.lowttl.example.net. a |
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echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
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echo |
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} | nsupdate -d -k $CONFBASE:key.example.net. |
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|
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=item node-down = relative-or-absolute-path |
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|
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Same as C<node-up>, but gets called whenever a connection is lost. |
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|
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=item pid-file = path |
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|
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The path to the pid file to check and create |
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(default: C<LOCALSTATEDIR/run/gvpe.pid>). |
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|
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=item private-key = relative-path-to-key |
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|
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Sets the path (relative to the config directory) to the private key |
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(default: C<hostkey>). This is a printf format string so every C<%> must |
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be doubled. A single C<%s> is replaced by the hostname, so you could |
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use paths like C<hostkeys/%s> to fetch the files at the location where |
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C<gvpectrl> puts them. |
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|
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Since only the private key file of the current node is used and the |
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private key file should be kept secret per-host to avoid spoofings, it is |
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not recommended to use this feature. |
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|
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=item rekey = seconds |
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|
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Sets the rekeying interval in seconds (default: C<3600>). Connections are |
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reestablished every C<rekey> seconds. |
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|
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=back |
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|
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=head2 NODE SPECIFIC SETTINGS |
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|
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The following settings are node-specific, that is, every node can have |
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different settings, even within the same gvpe instance. Settings that are |
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executed before the first node section set the defaults, settings that are |
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executed within a node section only apply to the given node. |
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|
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=over 4 |
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|
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=item compress = yes|true|on | no|false|off |
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|
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Wether to compress data packets sent to this host (default: C<yes>). |
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Compression is really cheap even on slow computers and has no size |
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overhead at all, so enabling this is a good idea. |
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|
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=item connect = ondemand | never | always | disabled |
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|
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Sets the connect mode (default: C<always>). It can be C<always> (always |
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try to establish and keep a connection to the given host), C<never> |
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(never initiate a connection to the given host, but accept connections), |
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C<ondemand> (try to establish a connection on the first packet sent, and |
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take it down after the keepalive interval) or C<disabled> (node is bad, |
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don't talk to it). |
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|
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=item dns-domain = domain-suffix |
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|
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The DNS domain suffix that points to the DNS tunnel server for this node. |
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|
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The domain must point to a NS record that points to the I<dns-hostname>, |
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i.e. |
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|
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dns-domainname = tunnel.example.net |
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dns-hostname = tunnel-server.example.net |
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|
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Corresponds to the following DNS entries in the C<example.net> domain: |
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|
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tunnel.example.net. NS tunnel-server.example.net. |
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tunnel-server.example.net. A 13.13.13.13 |
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|
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=item dns-hostname = hostname/ip |
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|
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The address to bind the DNS tunnel socket to, similar to the C<hostname>, |
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but for the DNS tunnel protocol only. Default: C<0.0.0.0>, but that might |
| 396 |
change. |
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|
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=item dns-port = port-number |
| 399 |
|
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The port to bind the DNS tunnel socket to. Must be C<53> on DNS tunnel servers. |
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|
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=item enable-dns = yes|true|on | no|false|off |
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|
| 404 |
See gvpe.protocol(7) for a description of the DNS transport |
| 405 |
protocol. Avoid this protocol if you can. |
| 406 |
|
| 407 |
Enable the DNS tunneling protocol on this node, either as server or as |
| 408 |
client. Support for this transport protocol is only available when gvpe |
| 409 |
was compiled using the C<--enable-dns> option. |
| 410 |
|
| 411 |
=item enable-icmp = yes|true|on | no|false|off |
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|
| 413 |
See gvpe.protocol(7) for a description of the ICMP transport protocol. |
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|
| 415 |
Enable the ICMP transport using icmp packets of type C<icmp-type> on this |
| 416 |
node. |
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|
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=item enable-rawip = yes|true|on | no|false|off |
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|
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See gvpe.protocol(7) for a description of the RAW IP transport protocol. |
| 421 |
|
| 422 |
Enable the RAW IPv4 transport using the C<ip-proto> protocol |
| 423 |
(default: C<no>). |
| 424 |
|
| 425 |
=item enable-tcp = yes|true|on | no|false|off |
| 426 |
|
| 427 |
See gvpe.protocol(7) for a description of the TCP transport protocol. |
| 428 |
|
| 429 |
Enable the TCPv4 transport using the C<tcp-port> port |
| 430 |
(default: C<no>). Support for this transport protocol is only available |
| 431 |
when gvpe was compiled using the C<--enable-tcp> option. |
| 432 |
|
| 433 |
=item enable-udp = yes|true|on | no|false|off |
| 434 |
|
| 435 |
See gvpe.protocol(7) for a description of the UDP transport protocol. |
| 436 |
|
| 437 |
Enable the UDPv4 transport using the C<udp-port> port (default: C<no>, |
| 438 |
unless no other protocol is enabled for a node, in which case this |
| 439 |
protocol is enabled automatically). |
| 440 |
|
| 441 |
NOTE: Please specify C<enable-udp = yes> if you want t use it even though |
| 442 |
it might get switched on automatically, as some future version might |
| 443 |
default to another default protocol. |
| 444 |
|
| 445 |
=item icmp-type = integer |
| 446 |
|
| 447 |
Sets the type value to be used for outgoing (and incoming) packets sent |
| 448 |
via the ICMP transport. |
| 449 |
|
| 450 |
The default is C<0> (which is C<echo-reply>, also known as |
| 451 |
"ping-replies"). Other useful values include C<8> (C<echo-request>, a.k.a. |
| 452 |
"ping") and C<11> (C<time-exceeded>), but any 8-bit value can be used. |
| 453 |
|
| 454 |
=item inherit-tos = yes|true|on | no|false|off |
| 455 |
|
| 456 |
Wether to inherit the TOS settings of packets sent to the tunnel when |
| 457 |
sending packets to this node (default: C<yes>). If set to C<yes> then |
| 458 |
outgoing tunnel packets will have the same TOS setting as the packets sent |
| 459 |
to the tunnel device, which is usually what you want. |
| 460 |
|
| 461 |
=item max-retry = positive-number |
| 462 |
|
| 463 |
The maximum interval in seconds (default: C<3600>, one hour) between |
| 464 |
retries to establish a connection to this node. When a connection cannot |
| 465 |
be established, gvpe uses exponential backoff capped at this value. It's |
| 466 |
sometimes useful to set this to a much lower value (e.g. C<120>) on |
| 467 |
connections to routers that usually are stable but sometimes are down, to |
| 468 |
assure quick reconnections even after longer downtimes. |
| 469 |
|
| 470 |
=item router-priority = 0 | 1 | positive-number>=2 |
| 471 |
|
| 472 |
Sets the router priority of the given host (default: C<0>, disabled). If |
| 473 |
some host tries to connect to another host without a hostname, it asks |
| 474 |
the router host for it's IP address. The router host is the one with the |
| 475 |
highest priority larger than C<1> that is currently reachable. |
| 476 |
|
| 477 |
Make sure all hosts always connect (C<connect = always>) to the router |
| 478 |
hosts, otherwise connecting to them might be impossible. |
| 479 |
|
| 480 |
The special value C<1> allows other hosts to route through the router |
| 481 |
host, but they will never route through it by default. The value C<0> |
| 482 |
disables routing. The idea behind this is that some hosts can, if |
| 483 |
required, bump the C<router-priority> setting to higher than C<1> in their |
| 484 |
local config to route through specific hosts. If C<router-priority> is |
| 485 |
C<0>, then routing will be refused, so C<1> serves as a "enable, but do |
| 486 |
not use by default" switch. |
| 487 |
|
| 488 |
=item tcp-port = port-number |
| 489 |
|
| 490 |
Similar to C<udp-port> (default: C<655>), but sets the TCP port number. |
| 491 |
|
| 492 |
=item udp-port = port-number |
| 493 |
|
| 494 |
Sets the port number used by the UDP protocol (default: C<655>, not |
| 495 |
officially assigned by IANA!). |
| 496 |
|
| 497 |
=back |
| 498 |
|
| 499 |
=head1 CONFIG DIRECTORY LAYOUT |
| 500 |
|
| 501 |
The default (or recommended) directory layout for the config directory is: |
| 502 |
|
| 503 |
=over 4 |
| 504 |
|
| 505 |
=item X<gvpe.conf> |
| 506 |
|
| 507 |
The config file. |
| 508 |
|
| 509 |
=item X<if-up> |
| 510 |
|
| 511 |
The if-up script |
| 512 |
|
| 513 |
=item X<node-up>, X<node-down> |
| 514 |
|
| 515 |
If used the node up or node-down scripts. |
| 516 |
|
| 517 |
=item X<hostkey> |
| 518 |
|
| 519 |
The private key (taken from C<hostkeys/nodename>) of the current host. |
| 520 |
|
| 521 |
=item X<pubkey/nodename> |
| 522 |
|
| 523 |
The public keys of the other nodes, one file per node. |
| 524 |
|
| 525 |
=back |
| 526 |
|
| 527 |
=head1 SEE ALSO |
| 528 |
|
| 529 |
gvpe(5), gvpe(8), gvpectrl(8). |
| 530 |
|
| 531 |
=head1 AUTHOR |
| 532 |
|
| 533 |
Marc Lehmann <gvpe@plan9.de> |
| 534 |
|
