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tunnel
2002 Dec 02
1
ipip and nexthdr
...fter carefull reading (LARTC) and experimentation, I am in a dead
end...
I am using several IPIP tunnels (linux ipip module, IP protocol 4).
I''d like to filter packets going through these tunnes to different
classes, on the ingress device, based on source and destination IP
_INSIDE THE TUNNEL_.
First I tried the nexthdr bit. As explained in LARTC, nexthdr jumps to
the next header in the packet, so I figured if it works for TCP, it
should also work for IP in IP, but it didn''t.
I looked at some ICMP echo request/reply packets with tcpdump dumping
packet contents in hex.
The...