Mailinglist Archive: opensuse (2112 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

All,

hardware: my router with three NICs.  

eth0 = local network (192.168.0.0/16)
eth1 = ptp to adsl box
eth2 = public network /27. 

Problem:

> From a box (box67) on the public network, I ping an external address.
Using tcpdump on eth2 I see the ICMP echo request. 
Using tcpdump on eth1 I see the ICMP echo request, and the echo reply
from the external host.  So far so good.

The echo reply never gets back to box67. I don't see it on eth2.

So I disabled the firewall on the router, and put ACCEPT in INPUT,
FORWARD and OUTPUT.  I added some iptables log entries, expecting to
see the echo reply somewhere.  I can't catch it anywhere.  I tried in
PREROUTING, and I see nothing. 
 
So how can tcpdump see the incoming echo reply, but I can't catch it in
PREROUTING?  Who's eating my packets?


/Per Jessen, Zürich

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