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Comparing gvpe/doc/gvpe.protocol.7.pod (file contents):
Revision 1.13 by root, Sat Apr 26 19:05:56 2014 UTC vs.
Revision 1.14 by root, Sat Apr 26 19:07:22 2014 UTC

… …
120 +------+------+--------+------+ 120 +------+------+--------+------+
121 | HMAC | TYPE | SRCDST | DATA | 121 | HMAC | TYPE | SRCDST | DATA |
122 +------+------+--------+------+ 122 +------+------+--------+------+
123 123
124The HMAC field is present in all packets, even if not used (e.g. in auth 124The HMAC field is present in all packets, even if not used (e.g. in auth
125request packets), in which case it is set to all zeroes. The checksum 125request packets), in which case it is set to all zeroes. The MAC itself is
126itself is calculated over the TYPE, SRCDST and DATA fields in all cases. 126calculated over the TYPE, SRCDST and DATA fields in all cases.
127 127
128The TYPE field is a single byte and determines the purpose of the packet 128The TYPE field is a single byte and determines the purpose of the packet
129(e.g. RESET, COMPRESSED/UNCOMPRESSED DATA, PING, AUTH REQUEST/RESPONSE, 129(e.g. RESET, COMPRESSED/UNCOMPRESSED DATA, PING, AUTH REQUEST/RESPONSE,
130CONNECT REQUEST/INFO etc.). 130CONNECT REQUEST/INFO etc.).
131 131

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