Setting up second nic for local lan backup

[Steven Buehler]

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
On Behalf Of Matt Iavarone
Sent: Wednesday, May 04, 2011 7:47 PM
To: General Red Hat Linux discussion list
Subject: Re: Setting up second nic for local lan backup

On Wed, May 4, 2011 at 8:40 PM, Steven Buehler <steve at ibushost.com> wrote:
> I have a Redhat 5.2 box that I am trying to setup in internal lan on 
> for backing up to a local machine since my Provider charges for any 
> bandwith going over the external IP's even though it comes right back 
> to another server of my network.  Below is the setup for the 2 nics 
> that I tried, but when I try to start the second nic with "ifup eth1", 
> it looses the route for the first nic so my external IP will no longer 
> work unless I restart it which then takes the route out of the second 
> nic.  What am I missing?  I hope someone can help me with this.  BTW, 
> the second nic is connected to an internal router.  I am assuming that 
> I can't just use a switch instead any easier.
>
> # cat ifcfg-eth0
> DEVICE=eth0
> BOOTPROTO=none
> HWADDR=00:1c:23:d5:be:02
> IPADDR=101.110.67.100
> NETMASK=255.255.255.0
> GATEWAY=101.110.67.1
> ONBOOT=yes
> TYPE=Ethernet
> PEERDNS=no
>
> # cat ifcfg-eth1
> BOOTPROTO=static
> DEVICE=eth1
> ONBOOT=no
> IPADDR=192.168.2.151
> GATEWAY=192.168.2.1
> NETMASK=255.255.255.0
> HWADDR=00:1c:23:d5:be:04
> PEERDNS=no
> TYPE=Ethernet
>

You need to remove the gateway from the second NIC and use iproute2 to add a
second default route for eth1.

-Matt

Thank you Matt,
Question, the router we were going to use has problems.  My boss wants to
buy a hub to use for this LAN we will be using on the second nics for
backups.  I don't like hubs.  Shouldn't we have another router or switch
instead? 

Thanks
Steve