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Old 10-14-2004, 02:08 PM   #1
LQ Newbie
Registered: Sep 2004
Posts: 29

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Multihomed host routing problem..

I have a 2 NIC host running Redhat Linux - eth0 ( and eth1 ( eth0 is connected to outside and eth1 is connected to my other device ( thru a crossover cable.

outside <---> host_eth0...host_eth1 <--crossover_cable-->test_device

I set up a static route in my 2-NIC host so that pkts to test_device go thru eth1. But, I cannot access test_device from outside world (other than from the 2-NIC host).

Could someone help me out?

Old 10-14-2004, 03:54 PM   #2
Registered: Sep 2003
Location: Rawalpindi, Pakistan
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have you enabled IP forwarding? If not then do the following and try again

echo "1" > /proc/sys/net/ipv4/ip_forward
Old 10-15-2004, 02:18 PM   #3
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Original Poster
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OK, I will restate my problem..

I have a box with 2 NICs (eth0 [] and eth1 []). I have connected another device - PDA( to eth1 thru a crossover cable.

Only eth0 is connected to outside thru a switch, and eth1 is as good as shorted to PDA.

I have set up a static route from eth0 to PDA thru eth1.
route add -host dev eth1
route add -host gw

But, I cannot ping PDA from outside of the 2-NIC box, and also cannot ping fom PDA to outside..

Any pointers as to why this is so??

Old 10-15-2004, 03:26 PM   #4
Registered: Nov 2003
Location: austria
Distribution: debian
Posts: 667

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this could be related to:
routing (route -n)
iptables (iptables -L- v)
settings in /proc/sys/net/ipv4 (ip_forwarding, ping stuff, misc other)

post more info. above, failure msg. + what's working.
sl mritch.


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