two NIC´s in the same LAN

alexjcg · n00b Joined: 16 Aug 2005 Posts: 45

Hi all;

I have the following scenario:

I´ve got a gentoo box with two nic´s but I want to use them in the same network. Thats because this machine is my file server, proxy, dhcp and radius. So my problem is that we transfer a lot of files to it per day and it congestion it´s nic so I want to put the two nic´s to work at the same lan but with diferent IP´s and diferen switch ports.
Like for my SMB server IP 192.192.192.60 and for de rest services IP 192.192.192.61 so when someone is tranfering a file (to IP 192.192.19260) there it doesnt uses the nic that is spcified to the other services (192.192.192.61).

How do I do this?

Thanks!

vad3r · Posted: Tue Jul 17, 2007 5:12 pm Post subject:

You have to decide which interface is used to access the default gateway. Here's a config where eth0 is used as default gw:

embobo · Guru Joined: 19 May 2003 Posts: 311

I'm not sure but I think just doing that will result in all traffic going out the eth0 even if it was received via eth1.

You may want to use bonding (trunking). See, e.g.,

http://www.linuxhorizon.ro/bonding.html
http://linux-ip.net/html/ether-bonding.html

vad3r · Posted: Tue Jul 17, 2007 7:05 pm Post subject:

Damn. embobo is right. I should start doing only one thing at a time. It was a long hard day

alexjcg · n00b Joined: 16 Aug 2005 Posts: 45

Ok I agree with him

if I do this I will receive a packege throw eth0 and send it back throw eth1. But bonding isnt like making two nic´s work like one (just raising bandwidth)? I need the two nic´s to work like they ware from diferent machines...

I was thinking here, isnt there a way (by iptables) to force if a package is received from a nic is forced to go out on the same nic?

jmbsvicetto · Posted: Tue Jul 17, 2007 8:57 pm Post subject:

Hi.

alexjcg · n00b Joined: 16 Aug 2005 Posts: 45

jmbsvicetto · Posted: Mon Jul 23, 2007 10:19 pm Post subject:

Look at Section 4.2 Routing for multiple uplinks/providers of the lartc document available at http://www.lartc.org/#download.
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