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I have a linux machine with 2 ethernet ports(eth0 and eth1). eth0 is connected to a router which assigns it an IP address 192.168.1.2. eth1 is connected to a switch which doesn't have an IP. How do I ping eth0 from eth1?

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could you explain why you want to ping one interface from another interface on the same machine? –  Marcel G Oct 20 '10 at 17:44

2 Answers 2

You can use the -I parameter, eg.

# ping -I eth1 192.168.1.2
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as the # suggests, one needs to be root to do that. –  Andre Holzner Feb 9 '11 at 12:07

If your eth1 doesnt have an IP, it will not be able to work with IP traffic (and ping / ICMP is IP traffic). Did I misunderstood your problem ?

Edit : I am not sure that I understand your network. Could you send a schema ?

If I understood correctly, you ahve eth0 configured with DHCP and eth1 configured manually. Are you sure that the address you have on eth1 is correct ? If you configured it as 10.0.0.1, you need to have y router with an interface in the same subnet, and the router has to be configured to route trafic from your 192.168.1.0/24 to you 10.0.0.0/24 networks.

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You understood my problem. I assigned an IP using: "ifconfig eth1 10.0.0.1 netmask 255.255.255.0 up". But still I can't ping. –  Nitish Oct 20 '10 at 14:18
    
You understood my network correctly. What happens if I configure eth1 as 192.168.1.254? What more should I do to make the ping work? –  Nitish Oct 20 '10 at 14:45

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