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Subject: Re: cipe-1.5.4, kernel 2.4.19, kernel messages
From: Roberto Nibali <ratz,AT,tac,DOT,ch>
Date: Wed, 14 Aug 2002 13:47:39 +0200
In-reply-to: <3D5AB3A6.12862.4C5ECE@localhost>

Hi Steve,

Steve Ripps wrote:
> 19:20:40 root@tux:/usr/src/linux# grep CONFIG_NETFILTER_DEBUG .config
> CONFIG_NETFILTER_DEBUG=y
> 
> Hmm.  So I just turn this off, recompile and forget about it?  Cool :)

That's my understanding, yes.

> I was thinking that is was something serious that would perhaps
> cause a kernel panik or something...  I wonder why I even turned it on
> anyway?  Silly me.

:) Kernel panic shouldn't happen with your output.

>>So do I assume correctly that you actually have the cipcb0 interface on top 
>of 
>>the ppp0 interface but you're only routing the cipe-related network through 
>the 
>>tunnel?
> 
> Yep.

Then it could be that the routing for locally generated packets from the 
cipcb0 
interface to the ppp0 interface get somehow a wrong rt->rt_src from an 
ip_route_output() lookup in the fib table. Currently I'm myself tracing some 
weird routing/iptables issues concerning NF_IP_LOCAL_IN/NF_IP_LOCAL_OUT. I 
already found a bug in the masquerading part of the ipchains compatibility 
code 
in der netfilter framework. But this has nothing to do with your problem ;).

> 19:36:03 root@gw:~# tcpdump --version
> tcpdump version 3.7.1
> libpcap version 0.4

ugh, how did you manage to combine this old libpcap fart with the new tcpdump 
source? :)

> 19:37:30 root@tux:~# tcpdump -i cipcb0
> tcpdump: listening on cipcb0
> 19:38:01.239787 10.2.0.254 > 10.2.1.254: icmp: echo request
> 19:38:01.249763 10.2.1.254 > 10.2.0.254: icmp: echo reply
> 19:38:02.199715 10.2.0.254 > 10.2.1.254: icmp: echo request
> 19:38:02.209629 10.2.1.254 > 10.2.0.254: icmp: echo reply
> 19:39:20 root@tux:~# tcpdump -i ppp0 not port ssh
> tcpdump: listening on ppp0
> 19:39:28.909533 203.52.103.254.1292 > 203.52.103.193.32775: udp 104
> 19:39:28.911273 203.52.103.193.32775 > 203.52.103.254.1292: udp 104
> 19:39:29.909506 203.52.103.254.1292 > 203.52.103.193.32775: udp 104
> 19:39:29.910858 203.52.103.193.32775 > 203.52.103.254.1292: udp 104

Everything seems to be ok.

> 19:40:02 root@tux:~# tcpdump --version
> tcpdump version 3.7.1
> libpcap version 0.7
> 
> 
> Thanks Roberto.  

No worries, get yourself a Toohey's Old and hang out at the Queens Park, your 
cipe runs like hell.

Cheers,
Roberto Nibali, ratz

-- 
echo '[q]sa[ln0=aln256%Pln256/snlbx]sb3135071790101768542287578439snlbxq' | dc





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