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Old 01-02-2005, 06:30 PM   #1
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Registered: Jan 2005
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Question Can't Ping External NIC on Gateway From Intranet Node

I've setup a LINUX PC running SUSE 9.2 that has one leg in the Internet and the other on a Intranet (home network). I have my a laptop also running the same OS as the gateway PC, which is connected directly to the NIC via a crossover cable.

I can ping the interface just fine. Could someone tell me please, why can I not ping the 64.x.x.x NIC that's going to my DSL modem and out to the Internet?

When I run tcpdump to show a ping action to my Intranet NIC via the laptop:
15:53:22.862725 IP > icmp 64: echo reply seq 2
15:53:23.862664 IP > icmp 64: echo request seq 3
Versus the same way to the other NIC on the gateway going to the Internet:
15:53:42.017753 IP > icmp64: echo request seq 2
I will not receive the echo reply sequence.

My routing on the gateway machine:
Destination Gateway Genmask Flags Metric Ref Use Iface U 0 0 0 eth0
64.1xx.xx.0 U 0 0 0 eth1 U 0 0 0 eth0 U 0 0 0 lo 64.1xx.xx.1 UG 0 0 0 eth1
My routing on my laptop client connected via crossover cable to the gateway machine:
Destination Gateway Genmask Flags Metric Ref Use Iface U 0 0 0 eth0 U 0 0 0 eth0 U 0 0 0 lo UG 0 0 0 eth0

On the SuSEFirewall2 I have:
FW_ROUTE = yes

Everything else is set to the default in /etc/sysconfig Editor.
Once I can ping the external card, then I know I can get the clients attached to the
Gateway Firewall box to the Internet.

Thanks in advance,


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