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ping problem with two external interfaces

+1 vote
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I have two different IP addresses (in a block of /29), one is on port 0 and the other is on port 2 of a Ciso 888. I am doing this so I can have two different certs with two different ip addresses.

I have tried:
1) one machine, two real interfaces, two cables (eth0 and eth2)
2) one machine, one real interface eth0 and one virtual interface eth0:1, one network cable

Using number 2) I can ping the two different ip addresses, no problem. The only problem here is that iptables does not work (I cannot create rules for eth0:1 - and yes I know about the security implications).

I have a problem with number number 1) I can ping the first ip address and I get a return, but I cannot get a return when I ping the second ip address. I can see traffic coming into the second interface but it does not return. Now one of the interfaces needs the "default" route applied (is this correct??), which is eth0.

I assume this is a routing problem? What do I need to do to get this to work?

posted Aug 20, 2013 by Meenal Mishra

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Why do you need different rules for eth0:1? Can't you specify the IP addresses?

1 Answer

0 votes

Two IP addresses within the same subnet is generally something that should be avoided if at all possible.
Check the following link
http://serverfault.com/questions/336021/two-network-interfaces-and-two-ip-addresses-on-the-same-subnet-in-linuxfor

answer Aug 20, 2013 by Mandeep Sehgal
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0 votes

When I try:

 ping -R www.google.com

I get:

PING www.google.com (173.194.113.112) 56(124) bytes of data.

but the list of nodes does not appear, and I wait for more than 5 minutes. traceroute www.google.com gives immediately the list of nodes.

This is fedora 18, iptables stopped (and flushed), firewalld stopped.Could it be somehow due to not flushing firewalld rules ? (I don't know much about firewalld)

+2 votes

I am unable to ping my EnB, PGW through ping application.. It says request timed out but thing is I am able to see Request-Reply packets in wireshark captures. Not getting any idea on what is going wrong.

Please suggest some inputs.


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