...

How would I, say, use nmap to do something like that? Is there a generic way to force a particular program to use a secondary IP address instead of the default primary?

<snip> > > But how about those programs that don't? > === Al > >

The only *generic* way that I know of, is to use IPTables to source-NAT your outbound connections. This will work OK if you have specific services in mind, you could just SNAT based on Destination port.can't remember off the top of my head if IPTables can mangle traffic based on the application...I seem to remember no, tho.

This would not work so good for nmap example you gave unfortunteatly.

That's actually intriguing. I think I'll try it out sometime.

In any case, the ping solution provided by Dennis will meet my needs in this particular case.

Thanks to you both. === Al