Re: Bridging wifi to ethernet

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On 5 Feb 2006 at 14:19, Les Mikesell wrote:

From: Les Mikesell <lesmikesell@xxxxxxxxx>
To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
Date sent: Sun, 05 Feb 2006 14:19:53 -0600
Subject: Re: Bridging wifi to ethernet
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On Sun, 2006-02-05 at 13:58, Douglas Phillipson wrote:

My LUG recently had to move to a Library with WIFI access only. Running
FC4 on my HP Pavilion laptop, how specifically, can I bridge my WIFI
interface (eth1) over to my eth0 interface so I can hook in all the
wired ethernet users to get access to the WIFI networks DHCP server? I
don't have to recompile a Kernel I hope... I can still use my laptop
normally while I'm bridging for everyone else I hope?


A simpler approach that is also more likely to work would be
to set up a different private address range on the wired side
and a dhcp server for it, then route and NAT to the wireless
interface. The only tricky part is that you either have
to run your own caching dns server and point the dhcp clients
to it, or you'll have to pick up the DNS server you receive
from the wireless DHCP and edit your dhcpd.conf to pass that
on to the clients.


The magic part I don't know how to do is "route and NAT". Can you
point me to an example on how to route and NAT between interfaces? Is
this a IPTables thing?

You just need to:
modprobe iptable_nat
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward

And make sure any other firewalling lets what you need through.
You should get a default route via dhcp on the wireless side
and one will be added by the netmask for your private wired
side so you don't need to add any extra routes.


You might also want to look at running a squid proxy server on the machine,
and have the clients use it. That way if you are going to the same sites, you
won't be downloading multiply copies of all the materials.




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Les Mikesell
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