Re: IP masquerade problem

Paul Rusty Russell (Paul.Russell@rustcorp.com.au)
Wed, 27 Oct 1999 14:59:15 +1000

In message <Pine.LNX.4.05.9910260855210.11707-100000@shodan.irccrew.org> you wr
ite:
> People using my IP masqueraded subnet complained to me that they
> can't access some websites from their workstations. I looked into
> this problem and saw something VERY strange happening.
>
> When I try to access one of the inaccessible websites, the value in
> /proc/sys/net/ipv4/ip_always_defrag is incremented by one!

RedHat have a modified kernel, which DaveM hacked, but this should be
OK. Every masq'd connection increments ip_always_defrag.

> Additionally, I know someone else is also experiencing the same
> problem, but I also know that some people are using IP masq with a
> similar setup without any problems.

tcpdump from the same network as the machine experiencing problems (if
possible) and a list of your ipchains rules would be appreciated.

Thanks,
Rusty.

--
Hacking time.


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