Hi there,
we have a well-equipped ASG box running on Intel S3420/XEON3450/16gig RAM with five NIC ports. Two of them onboard, two on a dual port Intel NIC and one on a 3COM 3C905. The 3COM plays the external interface role. The system runs very fine.
I build this system by myself from scratch in a 19" case and when I planned it, I decided to use five NIC ports to fit our needs. But during the tests I enjoyed to use virtual IP addresses instead of setting them on hardware. The machine has enough power to handle that.
Now I use only three hardware ports (int, ext and DMZ), the ext port has three virtual IP addresses and that works fine. The system sees five eth-devices - 0, 1, 2, 5 and 6. Numbers 1 and 2 are not used.
The number 6 is the 3COM NIC and if I can change the hardware from eth6 to eth2 the 3COM is completely obsolete. I also thought that having a spare NIC port is a good idea in case of a failed port.
But if I change the ext port from eth6 to eth2 no more http traffic goes out. ???
The newly selected interface is up and because it is the external IF it is connected to the world and it receives emails - it represents our external MX entry.
But it is not possible to send http traffic, the system seems to be deaf for that. The proxy is up and used by the clients, but no external web site can be reached - time out.
In case of changing the eth-assignment all other settings remain the same, right? I only edit the appropriate IF, select an unused eth and save. That's it. But it isn't.
Is there a point I missed to configure? All the SNAT/DNAT/routing stuff should remain untouched as they refer only to the configured external IF, not to the hardware.
Bug or feature - maybe someone can shed some light on that. Or do we talk about a bug?
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