On Wed, Feb 14, 2007 at 08:30:48AM +0100, Paul Viney wrote:
> > > I still seem to have much the same problem. I no longer get ICMP
> > > unreachable errors, but the packet just seems to disappear - I can't see
> > > it being forwarded on any interface, nor can I find any kind of reply -
> > > icmp or otherwise.
> >
> > sounds like a firewall issue!
>
> It does sound like a firewall issue, but the only firewall rule I have at the
> moment is the one doing the DNAT. If I do 'iptables -t nat -L -v', then I can
> see the number of packets increasing. Once I remove the firewall rule, I get
> my "icmp unreachable" errors again. Funnily enough, if I then reinstate the
> firewall (dnat) rule, then I still get "icmp unreachable" errors and the
> packet count doesn't go up for the rule. It's almost as though the rule
> doesn't get consulted. 'ip route flush cache' doesn't make a difference.
> After about 5 minutes the "icmp unreachable" errors stop and the packet count
> starts going up, although I still can't find my packet on the next hop. (I do
> have forwarding switched on). The packet count on a iptables log rule on the
> forward table does not go up, giving me the impression that routing has
> failed.
This could be connection tracking, once you start a ping, connection tracking
will keep it in its cache, so even though you have placed it (the rule) back in
it doesn't count for the established link...
> I also tried ip r get <random internet address> from 192.168.12.5, which did
> indeed give me the same "RTNETLINK answers: Invalid argument" error. I guess
> that means that my understanding of the purpose of 'ip r get' is indeed
> faulty.
does 192.168.12.5 exist on your box, can up do an ip a
also do you have forwarding on ?
>
> Thanks for all your help so far.
>
> Paul Viney
>
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