single network interface has two IP addresses

[Janghyegyung]

I asked a question about load balancing with L4 and nobody helped me. Ok, I am trying with simple a simple question.

I want to have another IP on network interface lo0(loopback) by this command
#ifconfig lo0 newIP alias netmask X.X.X.X broadcast Y.Y.Y.Y

Then I tried ping to newIP on my own machine but I could not.

I am not sure, but i think it is the problem realted to the routing on AIX. I've heared about the restriction routing to logical address which is not matched the physical interface.

 

[bjverzal]

Why would you want to set up an additional address on the loopback ? What is your business case for this ?

Bill.

 

[Janghyegyung]

Bill..
We have two servers and these are for web service with WebSphere then we need load balancing for robustic http service.

We connected these servers to L4 switch, then if we tried to connect logical IP(this IP is the second IP address on loopback network interface),but actually this is to connect to two servers because L4 switch can send to one server and the other depending by its mechanism.

Hmm..
I have a problem writing the description in English but I hope you understand this concept.

 

[bjverzal]

You should probably put the alias IP address on the Ethernet.

Bill.