[CentOS] Dual personality Server (network pass through)

Mon Jun 14 23:06:33 UTC 2010
Eero Volotinen <eero.volotinen at iki.fi>

2010/6/15 Robert Arkiletian <robark at gmail.com>:
> I have 3 nics in a NATed gateway file server. Two nics (eth1, eth2)
> provide dhcp and nfs services to an internal subnet via a dedicated
> switch. The other nic (eth0) connects to an external WAN switch to
> provide net access to the systems in the subnet.
>
>                               --- eth1
> WAN switch eth0 --- |               SUBNET switch
>                               --- eth2
>
> Question:
> Is it possible to disable the NATing, nfs, dhcp and just somehow
> bridge the external WAN nic to the internal ones such that it's just a
> pass through? Basically having the server behave like a switch?
> Allowing the internal systems to join the network on the WAN. I know
> how to disable NAT, nfs and dhcp but not how to configure the nics.
>
> I know I could simply unplug eth1, eth2 from the server and plug them
> into the WAN switch but my goal is to script this so I don't have to
> physically plug and unplug network cables each time.

Just create network bridge:
http://www.cyberciti.biz/faq/rhel-linux-kvm-virtualization-bridged-networking-with-libvirt/



--
Eero