On my linux machine I have:
- one physical interface eth0 with the public ip x.x.x.x
- one logical interface eth0:0 with the public ip t.t.t.t
- BIND DNS listening to t.t.t.t
If I ping t.t.t.t from any other place, it responds back, so that's good.
What I'm trying to do is set up BIND to use the t.t.t.t ip for zone exchange, the only bad thing is that traffic returning from the master server is going back to x.x.x.x.
I have tried some SNAT but I didn't quite hit the spot, traffic did match my rule but the master BIND would still reply to x.x.x.x.