Re: A router bug?

Rani Assaf (rani@easynet.fr)
31 Jan 1999 15:09:22 GMT


Hi,

> > his case being the slip link, i'll defer. in my case, being a GRE tunnel,
>
> My cases are SLIP and T3. Can someone, who is behind a Linux router,
> please try
>
> https://webbroker.waterhouse.com

Works here with router and host running 2.2.1

Doesn't work with host running 2.1.132 and a commercial firewall.

Also, it seems that I cannot connect to the following sites:

www.fore.com
www.extremenetworks.com

I tried 2.2.[0|1] and 2.1.132.

I'll try to come up with some tcpdump outputs tomorrow.

> > i'm sticking to my guns. something's broken. i've said it several times
> > with nary a comment in reply.
>
> Something is broken.

Some weird messages I saw in my syslog on the router while it was
still running 2.1.132:

Jan 28 17:47:38 r2d2 kernel: IP_MASQ:forward ICMP: failed checksum from
207.94.36.10!
Jan 28 17:48:13 r2d2 last message repeated 7 times
Jan 28 17:49:18 r2d2 last message repeated 13 times
Jan 28 17:49:23 r2d2 kernel: IP_MASQ:forward ICMP: failed checksum from
207.94.36.10!

This is really bad because I had no masquerading rules on this machine
(even though ip_masq is built into the kernel). So this part of the
code shouldn't be triggered.

And the problem occurs with or without firewalling rules.

Rani

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