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.\" ======================================================================== |
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.\" |
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.IX Title "VPED.CONF 5" |
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.TH VPED.CONF 5 "2003-03-23" "0.1" "Virtual Private Ethernet" |
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.SH "NAME" |
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vped.conf \- vpe daemon configuration file |
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.SH "SYNOPSIS" |
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.IX Header "SYNOPSIS" |
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.Vb 3 |
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\& udp-port = 407 |
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\& mtu = 1492 |
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\& ifname = vpn0 |
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.Ve |
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.PP |
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.Vb 2 |
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\& node = branch1 |
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\& hostname = 1.2.3.4 |
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.Ve |
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.PP |
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.Vb 3 |
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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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.Ve |
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.PP |
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.Vb 2 |
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\& node = branch3 |
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\& connect = ondemand |
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.Ve |
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.SH "DESCRIPTION" |
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.IX Header "DESCRIPTION" |
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The vpe config file consists of a series of lines that contain \f(CW\*(C`variable |
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= value\*(C'\fR pairs. Empty lines are ignored. Comments start with a \f(CW\*(C`#\*(C'\fR 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 \f(CW\*(C`=\*(C'\fR sign or |
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after values, but not within the variable names or values themselves. |
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.PP |
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The only exception to the above is the \*(L"on\*(R" directive that can prefix any |
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\&\f(CW\*(C`name = value\*(C'\fR setting and will only \*(L"execute\*(R" it on the named node, or |
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(if the nodename starts with \*(L"!\*(R") on all nodes except the named one. |
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.PP |
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.Vb 3 |
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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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.Ve |
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.PP |
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All settings are executed \*(L"in order\*(R", that is, later settings of the same |
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variable overwrite earlier ones. |
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.SH "ANATOMY OF A CONFIG FILE" |
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.IX Header "ANATOMY OF A CONFIG FILE" |
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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 \f(CW\*(C`node = |
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nickname\*(C'\fR line. |
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.PP |
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Every node that is part of the network must have a section that starts |
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with \f(CW\*(C`node = nickname\*(C'\fR. 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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.PP |
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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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.SH "CONFIG VARIABLES" |
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.IX Header "CONFIG VARIABLES" |
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.Sh "\s-1GLOBAL\s0 \s-1SETTINGS\s0" |
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.IX Subsection "GLOBAL SETTINGS" |
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Global settings will affect the behaviour of the running vped 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 \f(CW\*(C`on\*(C'\fR), but will affect the behaviour of |
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the vped daemon and all connections it creates. |
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.IP "loglevel = noise|trace|debug|info|notice|warn|error|critical" 4 |
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.IX Item "loglevel = noise|trace|debug|info|notice|warn|error|critical" |
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Set the logging level. Connection established messages are logged at level |
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\&\f(CW\*(C`info\*(C'\fR, notable errors are logged with \f(CW\*(C`error\*(C'\fR. Default is \f(CW\*(C`info\*(C'\fR. |
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.IP "node = nickname" 4 |
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.IX Item "node = nickname" |
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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 vped daemon. |
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.IP "private-key = relative-path-to-key" 4 |
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.IX Item "private-key = relative-path-to-key" |
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Sets the path (relative to the config directory) to the private key |
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(default: \f(CW\*(C`hostkey\*(C'\fR). This is a printf format string so every \f(CW\*(C`%\*(C'\fR must |
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be doubled. A single \f(CW%s\fR is replaced by the hostname, so you could |
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use paths like \f(CW\*(C`hostkeys/%s\*(C'\fR to fetch the files at the location where |
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\&\f(CW\*(C`vpectrl\*(C'\fR puts them. |
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.Sp |
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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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.IP "ifpersist = yes|no" 4 |
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.IX Item "ifpersist = yes|no" |
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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 vped exits? Some versions of the tunnel device have |
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problems sending packets when vped 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 \f(CW\*(C`off\*(C'\fR and do an ifconfig down on the |
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device. |
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.IP "ifname = devname" 4 |
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.IX Item "ifname = devname" |
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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 \f(CW\*(C`tun0\*(C'\fR. |
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.IP "rekey = seconds" 4 |
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.IX Item "rekey = seconds" |
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Sets the rekeying interval in seconds (default: \f(CW3600\fR). Connections are |
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reestablished every \f(CW\*(C`rekey\*(C'\fR seconds. |
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.IP "keepalive = seconds" 4 |
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.IX Item "keepalive = seconds" |
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Sets the keepalive probe interval in seconds (default: \f(CW60\fR). 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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.IP "mtu = bytes" 4 |
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.IX Item "mtu = bytes" |
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Sets the maximum \s-1MTU\s0 that should be used on outgoing packets (basically |
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the \s-1MTU\s0 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 \f(CW\*(C`if\-up\*(C'\fR script. |
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.Sp |
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Recommended values are 1500 (ethernet), 1492 (pppoe), 1472 (pptp). |
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.Sp |
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This value must be the minimum of the mtu values of all hosts. |
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.IP "if-up = relative-or-absolute-path" 4 |
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.IX Item "if-up = relative-or-absolute-path" |
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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 |
| 256 |
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environment variables are passed to it (the values are just examples): |
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.RS 4 |
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.IP "CONFBASE=/etc/vpe" 4 |
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.IX Item "CONFBASE=/etc/vpe" |
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The configuration base directory. |
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.IP "IFNAME=vpn0" 4 |
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.IX Item "IFNAME=vpn0" |
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The interface to initialize. |
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.IP "MTU=1436" 4 |
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.IX Item "MTU=1436" |
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The \s-1MTU\s0 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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.IP "MAC=fe:fd:80:00:00:01" 4 |
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.IX Item "MAC=fe:fd:80:00:00:01" |
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The \s-1MAC\s0 address to set the interface to. The script *must* set the |
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interface \s-1MAC\s0 to this value. On GNU/Linux you will most likely use this: |
| 272 |
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.Sp |
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.Vb 1 |
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\& ip link set $IFNAME address $MAC mtu $MTU up |
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.Ve |
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.IP "NODENAME=branch1" 4 |
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.IX Item "NODENAME=branch1" |
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The nickname of the current node, as passed to the vped daemon. |
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.IP "NODEID=1" 4 |
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.IX Item "NODEID=1" |
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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 \s-1ID\s0 1, the second \s-1ID\s0 2 and so on. |
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.RE |
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.RS 4 |
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.Sp |
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Here is a simple if-up script: |
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.Sp |
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.Vb 5 |
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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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.Ve |
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.Sp |
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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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.RE |
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.IP "node-up = relative-or-absolute-path" 4 |
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.IX Item "node-up = relative-or-absolute-path" |
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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 \f(CW\*(C`if\-up\*(C'\fR scripts, the following environment |
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variables will be set: |
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.RS 4 |
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.IP "DESTNODE=branch2" 4 |
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.IX Item "DESTNODE=branch2" |
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The name of the remote node. |
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.IP "DESTID=2" 4 |
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.IX Item "DESTID=2" |
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|
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The node id of the remote node. |
| 312 |
|
|
.IP "DESTIP=188.13.66.8" 4 |
| 313 |
|
|
.IX Item "DESTIP=188.13.66.8" |
| 314 |
|
|
The numerical \s-1IP\s0 address of the remote host (vped accepts connections from |
| 315 |
|
|
everywhere, as long as the other host can authenticate itself). |
| 316 |
|
|
.IP "DESTPORT=407 # deprecated" 4 |
| 317 |
|
|
.IX Item "DESTPORT=407 # deprecated" |
| 318 |
|
|
The \s-1UDP\s0 port used by the other side. |
| 319 |
|
|
.IP "STATE=UP" 4 |
| 320 |
|
|
.IX Item "STATE=UP" |
| 321 |
|
|
Node-up scripts get called with STATE=UP, node-down scripts get called |
| 322 |
|
|
with STATE=DOWN. |
| 323 |
|
|
.RE |
| 324 |
|
|
.RS 4 |
| 325 |
|
|
.Sp |
| 326 |
|
|
Here is a nontrivial example that uses nsupdate to update the name => ip |
| 327 |
|
|
mapping in some dns zone: |
| 328 |
|
|
.Sp |
| 329 |
|
|
.Vb 6 |
| 330 |
|
|
\& #!/bin/sh |
| 331 |
|
|
\& { |
| 332 |
|
|
\& echo update delete $DESTNODE.lowttl.example.net. a |
| 333 |
|
|
\& echo update add $DESTNODE.lowttl.example.net. 1 in a $DESTIP |
| 334 |
|
|
\& echo |
| 335 |
|
|
\& } | nsupdate -d -k $CONFBASE:key.example.net. |
| 336 |
|
|
.Ve |
| 337 |
|
|
.RE |
| 338 |
|
|
.IP "node-down = relative-or-absolute-path" 4 |
| 339 |
|
|
.IX Item "node-down = relative-or-absolute-path" |
| 340 |
|
|
Same as \f(CW\*(C`node\-up\*(C'\fR, but gets called whenever a connection is lost. |
| 341 |
|
|
.Sh "\s-1NODE\s0 \s-1SPECIFIC\s0 \s-1SETTINGS\s0" |
| 342 |
|
|
.IX Subsection "NODE SPECIFIC SETTINGS" |
| 343 |
|
|
The following settings are node\-specific, that is, every node can have |
| 344 |
|
|
different settings, even within the same vped instance. Settings that are |
| 345 |
|
|
executed before the first node section set the defaults, settings that are |
| 346 |
|
|
executed within a node section only apply to the given node. |
| 347 |
|
|
.IP "udp-port = port-number" 4 |
| 348 |
|
|
.IX Item "udp-port = port-number" |
| 349 |
|
|
Sets the port number used by the \s-1UDP\s0 protocol (default: \f(CW407\fR, not |
| 350 |
|
|
officially assigned by \s-1IANA\s0!). |
| 351 |
|
|
.IP "router-priority = positive-number" 4 |
| 352 |
|
|
.IX Item "router-priority = positive-number" |
| 353 |
|
|
Sets the router priority of the given host (default: \f(CW0\fR, disabled). If |
| 354 |
|
|
some host tries to connect to another host without a hostname, it asks |
| 355 |
|
|
the router host for it's \s-1IP\s0 address. The router host is the one with the |
| 356 |
|
|
highest priority that is currently reachable. Make sure all clients always |
| 357 |
|
|
connect to the router hosts, otherwise conencting to them is impossible. |
| 358 |
|
|
.IP "connect = ondemand|never|always|disabled" 4 |
| 359 |
|
|
.IX Item "connect = ondemand|never|always|disabled" |
| 360 |
|
|
Sets the connect mode (default: \f(CW\*(C`always\*(C'\fR). It can be \f(CW\*(C`always\*(C'\fR (always |
| 361 |
|
|
try to establish and keep a conenction to the given host), \f(CW\*(C`never\*(C'\fR |
| 362 |
|
|
(nevr initiate a connection to the given host, but accept connections), |
| 363 |
|
|
\&\f(CW\*(C`ondemand\*(C'\fR (try to establish a connection on the first packet sent, and |
| 364 |
|
|
take it down after the keepalive interval) or \f(CW\*(C`disabled\*(C'\fR (node is bad, |
| 365 |
|
|
don't talk to it). |
| 366 |
|
|
.IP "inherit-tos = yes|no" 4 |
| 367 |
|
|
.IX Item "inherit-tos = yes|no" |
| 368 |
|
|
Wether to inherit the \s-1TOS\s0 settings of packets sent to the tunnel when |
| 369 |
|
|
sending packets to this node (default: \f(CW\*(C`yes\*(C'\fR). If set to \f(CW\*(C`yes\*(C'\fR then |
| 370 |
|
|
outgoing tunnel packets will have the same \s-1TOS\s0 setting as the packets sent |
| 371 |
|
|
to the tunnel device, which is usually what you want. |
| 372 |
|
|
.IP "compress = yes|no" 4 |
| 373 |
|
|
.IX Item "compress = yes|no" |
| 374 |
|
|
Wether to compress data packets sent to this host (default: \f(CW\*(C`yes\*(C'\fR, |
| 375 |
|
|
compression is really cheap even on slow computers and has no size |
| 376 |
|
|
overhead at all). |
| 377 |
|
|
.SH "CONFIG DIRECTORY LAYOUT" |
| 378 |
|
|
.IX Header "CONFIG DIRECTORY LAYOUT" |
| 379 |
|
|
The default (or recommended) directory layout for the config directory is: |
| 380 |
|
|
.IP "vped.conf" 4 |
| 381 |
|
|
.IX Item "vped.conf" |
| 382 |
|
|
The config file. |
| 383 |
|
|
.IP "if-up" 4 |
| 384 |
|
|
.IX Item "if-up" |
| 385 |
|
|
The if-up script |
| 386 |
|
|
.IP "node\-up, node-down" 4 |
| 387 |
|
|
.IX Item "node-up, node-down" |
| 388 |
|
|
If used the node up or node-down scripts. |
| 389 |
|
|
.IP "hostkey" 4 |
| 390 |
|
|
.IX Item "hostkey" |
| 391 |
|
|
The private key (taken from \f(CW\*(C`hostkeys/nodename\*(C'\fR) of the current host. |
| 392 |
|
|
.IP "pubkey/nodename" 4 |
| 393 |
|
|
.IX Item "pubkey/nodename" |
| 394 |
|
|
The public keys of the other nodes, one file per node. |
| 395 |
|
|
.SH "SEE ALSO" |
| 396 |
|
|
.IX Header "SEE ALSO" |
| 397 |
|
|
\&\fIvpe\fR\|(8), \fIvpectrl\fR\|(8). |
| 398 |
|
|
.SH "AUTHOR" |
| 399 |
|
|
.IX Header "AUTHOR" |
| 400 |
|
|
Marc Lehmann <vpe@plan9.de> |
