two network card merging

gentoopewpew · n00b Joined: 08 May 2006 Posts: 49

So
here is my dilemma.
I have two network cards on my gentoo box (eth0 and eth1)
eth0 is my network
i want eth1 to pipe eth0 through, i.e. so i can connect another computer.
is there any other way besides iptables that can do this and is rather easy.
im having trouble with the iptables dnsmasq way.
thanks

didymos · Posted: Sun Jun 24, 2007 8:04 pm Post subject:

Would ethernet bridging do what you want? It basically just glues two interfaces into a single one, usually called br0. The component interfaces then behave like ports. I use it with one wireless card and an onboard LAN device. Traffic from the other computer connected by wireless is passed back and forth through the DSL modem, and I can surf at the same time, no problem. If so, you'll want to set:

gentoopewpew · n00b Joined: 08 May 2006 Posts: 49

so u can bridge and use the internet?
i tried bridging once, but what happened was the host couldnt connect to the internet but the client could.

didymos · Posted: Wed Jun 27, 2007 12:44 pm Post subject:

Umm, yeah. It's how I'm connected right now. Question: when you set it up before, did you give the bridge it's own IP address, or have it assigned one by DHCP (if that's how your setup works)?
_________________
Thomas S. Howard

RoundsToZero · Guru Joined: 17 Nov 2003 Posts: 478 Location: New York, NY

If you want the bridge machine itself to have net access you do have to make sure the br0 device gets an IP address. DHCP is recommended unless you are already in an environment that uses all static IP's.

yuwy · n00b Joined: 22 May 2006 Posts: 38

hmm, well I did it the iptables way although its kind of a hassle for first timers. The kernel option for
advanced router needs to be set and the bummer is that you cant have ath_pci mod going on at the same
time or else it kernel panics.

If you just want to make your packets go to and fro from eth0 and eth1 wouldn't just getting a hub do that?

Spoony · Posted: Thu Jun 28, 2007 9:19 pm Post subject:

http://gentoo-wiki.com/HOWTO_setup_a_gentoo_bridge

Best place to look....
but a quick and dirty is:

emerge bridge-utils
ln -s /etc/init.d/net.lo /etc/init.d/net.eth0
ln -s /etc/init.d/net.lo /etc/init.d/net.eth1
ln -s /etc/init.d/net.lo /etc/init.d/net.br0

in /etc/conf.d/net
depend_br0() {
need net.eth0 net.eth1
}
bridge_br0="eth0 eth1"
config_eth0=( "null" )
config_eth1=( "null" )
config_br0=( "dhcp" ) or config_br0=( "xxx.xxx.xxx.xxx netmask 255.255.255.0" )
_________________
Regards,
Mike Sponsler
msponsler at gmail.com