Bridging wlan0 to eth0

Question

On arch Linux, I would like to mainly have eth0 (connected to bridged router) share the connection recieved from wlan0, Ive read tutorials but I'm not command sabby as other users are and don't completely understand. I would appreciate some help! Ty!

Answer 1

UPDATE

It is not possible to bridge between wireless (client a.k.a. station mode) and wired intefaces

According to this thread: http://kerneltrap.org/mailarchive/linux-ath5k-devel/2010/3/21/6871733

Setup NAT

One should set up NAT instead:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE

Assigning an IP

Then you have to assign IP addresses to yourself:

ifconfig eth0 10.0.0.1 netmask 255.255.255.0 up

Install dhcp daemon

Install a dhcp server and add the following text to its config file (in /etc/dhcpd.conf or something similar)

subnet 10.0.0.0 netmask 255.255.255.0 {
    range 10.0.0.100 10.0.0.120;
    option routers 10.0.0.1;
    option domain-name-servers the-ip-address-you-have-in-etc-resolv.conf;
}

Start dhcpd

Then start it /etc/init.d/dhcpd start

And that's it!

Only read below if you are interested in the non-working bridging setup

---

brctl addbr mybridge
brctl addif mybridge eth0
brctl addif mybridge wlan0

First you create a bridge interface I choose an arbitrary name mybridge then add intefaces to it.

You should request a new ip address (This is needed only if you want to get a valid IP for the bridging device itself):

dhclient -d mybridge