Two External Interfaces, One With “default” Route And Ping Problem

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Hi

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?

Jobst

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