Re: Routing problems

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On Thu, 2010-02-18 at 13:48 +0100, j.halifax . wrote: 
> > I think the problem is probably the routing tables in the other boxes
> > in the same LAN (e.g. 10.255.250.38)
> 
> route in 10.255.250.38:
> Destination  Gateway   Genmask    Flags Metric Ref    Use Iface
> 192.168.122.0   *      255.255.255.0   U     0      0        0 virbr0
> 10.255.250.0    *      255.255.255.0   U     0      0        0 eth0
> link-local          *      255.255.0.0       U     0      0        0 eth0
> default   10.255.250.37  0.0.0.0         UG    0      0        0 eth0
> 
> traceroute -n 172.17.1.50 (from 10.255.250.38):
> traceroute to 172.17.1.50 (172.17.1.50), 30 hops max, 40 byte packets
>  1  10.255.250.37  0.194 ms  0.124 ms  0.120 ms
>  2  195.39.130.92  3000.438 ms !H  3000.449 ms !H  3000.427 ms !H
> 
> The request comes to the LAN default GW and fells through to
> its default GW eth0 leading to Internet, instead of going to eth3
> 
> :((
> Thank you...
> jh
> 
> 

I'm still stumped.

What happens if you try to "ping" from the eth2 interface of the router?

ping -I 10.255.250.37 172.17.1.50

I guess the following is equivalent:
ping -I eth2 172.17.1.50

I expect this ping to fail.

I am still suspicious iptables is involved.  

If your router had periods of time when there was no traffic,
I would do 
iptables -L -v 
to get the packet counts for every iptables rule,
do the ping from the PC that fails, and do
iptables -L -v
again and compare the packet counts for every iptables rule,
to determine which iptables rules were being used for the ping packets.




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