I have a really odd problem. When I ping from a host behind my shorewall
router, the first packet is lost. After that, the packets seem to route
properly.
An example of the tcpdump session is below, where local host is
172.16.5.178, shorewall router is 199.199.199.2, and far host is
151.164.1.8.
20:01:04.819745 IP 172.16.5.178 > 151.164.1.8: ICMP echo request, id 1, seq
107,length 40
20:01:09.439000 IP 172.16.5.178 > 151.164.1.8: ICMP echo request, id 1, seq
108,length 40
20:01:09.439240 IP 199.199.199.2 > 151.164.1.8: ICMP echo request, id 1, seq
108, length 40
20:01:09.456248 IP 151.164.1.8 > 199.199.199.2: ICMP echo reply, id 1, seq
108, length 40
20:01:09.456425 IP 151.164.1.8 > 172.16.5.178: ICMP echo reply, id 1, seq
108, length 40
20:01:10.438014 IP 172.16.5.178 > 151.164.1.8: ICMP echo request, id 1, seq
109,length 40
20:01:10.438130 IP 199.199.199.2 > 151.164.1.8: ICMP echo request, id 1, seq
109, length 40
20:01:10.453801 IP 151.164.1.8 > 199.199.199.2: ICMP echo reply, id 1, seq
109, length 40
20:01:10.453923 IP 151.164.1.8 > 172.16.5.178: ICMP echo reply, id 1, seq
109, length 40
I am using shorewall v 4.4.14 and Centos 5.3 /c kernel 2.6.18-194.26.1.el5
Any ideas what I should look for? I did try the same thing from the
shorewall firewall itself, and all packets go just fine.
Thanks,
Ronnie
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