2 Ethernet Cards - DNS Questions

Question

When running DNS with multiple cards do you need to state in DNS what that other IP address is used for? We use it for the Light on management. Issue is you can still connect to the other network card to configure WM and such. Shouldnt WM and SA only respond to the port in which the services are running on? Would a changeip command fix that issue? .100 is what the AFP and other services run on and lets say .101 is what LOM is running off of. BTW this is a new intel xserve.

Answer 1

>Is this what most people are doing with the xserves since they are coming with 2 ethernet nics?
I don't know about most, but some people are, for sure.
In general there are a few common uses for dual NICs on the server. In no particular order they include:
Port trunking
binding multiple ports together for capacity and/or redundancy (if one link dies, the other keeps ticking, at least hopefully).
Separation of services
Run some services on one NIC (e.g. web server) and other services on the other NIC (e.g. AFP). That way your 200GB photoshop uploads have minimal impact on the web traffic (note that this only works in specific configurations due to the issue of multiple IP addresses in the same subnet).
public/private network
Use one NIC as a public-facing interface, the other as a private, local network - allows things like NAT to share the public link with internal clients, or a VPN to provide secure connections from outside the physical network. Can also be combined with the above to run 'internal' services on the private link, hidden from the public.
I'm sure there are other uses, but those are the commonest ones that I'm aware of.
  Mac OS X (10.4.8)