[CentOS] 2 nics, 2 networks, 2 switches

John R Pierce pierce at hogranch.com
Wed Sep 19 20:52:21 UTC 2007

Kanwar Ranbir Sandhu wrote:
> The server is running CentOS 5, and it has two NICs on it.  NIC 1 is
> currently active, and plugged into network A - let's say it's
>  NIC 2 is currently disabled.  I want to
> enable it, but on a different network - let's say it's
> Network A is in a fairly well locked down DMZ.  I can get to only some
> devices on network B from network A.  Network B has full access to
> Network A.
> Network A and Network B each use different gateways, so I can't use
> network A's gateway (which is in the DMZ) for NIC 2.  NIC 2 would have
> to use network B's gateway.
> I need to activate both NICs because services running on the box need to
> access devices on network B, and that's only possible from within
> network B itself.

are there OTHER networks on the WAN accessed via B's gateway/router ?   
network A's gateway is the internet route?

if B's gateway has routes to the rest of 10.x.x.x, I'd just define a 
static route like -> B's gateway/router's IP, and leave the 
DEFAULT gateway as network A's internet/DMZ router.

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