[vpnc-devel] "packet too short" message

[Maurice Massar]

hi,

On Sun, Feb 27, 2005 at 05:14:30PM +0100, Alessandro Suardi wrote:
> tcpdump: listening on wlan0, link-type EN10MB (Ethernet), capture size 96 bytes
> 16:42:46.809020 IP (tos 0x0, ttl 114, id 21504, offset 0, flags
> [none], proto 17, length: 29) 193.32.x.xx.4500 > 192.168.1.6.4500: [no
> cksum] UDP, length 1
...
> It's very easy to see that the packets triggering the message are the ones
>  with length=1, no flags, no cksum, as these packets come in from the
>  VPN server even when I'm doing nothing, so matching the tcpdump
>  output and the syslog messages is a piece of cake :)

ah.. I remember. These packets are defined in the NAT-T RFC to keep the
NAT mapping alive, so it is safe to just ignore them (and maybe vpnc
should send them too...)

cu
maurice