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Re: bridging eth1 to eth0

On Fri, Dec 29, 2006 at 04:42:49PM -0500, Matt Price wrote:
> From: 	Matt Price <matt.price@utoronto.ca>
> To: 	TLUG <tlug@ss.org>
> Subject: 	bridge eth1 to eth0?
> Date: 	Fri, 29 Dec 2006 15:51:31 -0500
> hi,
> for stupid reasons I need to install via netboot on a compaq tablet
> (hoping this will work, it's my last shot!).  I have an ubuntu desktop
> with two ethernet cards, eth0 & eth1, and have set up dhcp & tftp on
> eth1 as documented in various places on the web, e.g. here:
> http://www.debian-administration.org/articles/478
> this works fine to a point.  I have the ubuntu edgy netboot images
> in /var/lib/tftpboot, my tablet starts up with pxe, finding the images,
> and is ready to install but cannot find the broader internet 0-- it
> doesn't seem to see past the eth1 subnet.  So, probably a simple
> question:  how  do I enable the eth1 traffic to bridge across to eth0
> and thus access the whole internet?  I guess it has something to do with
> ip forwarding or ip masquarading or one of those very scary and arcane
> pieces of dark magic.

yes its ip_forward. not scary or arcane. since you're behind a
firewall, you may not have to do anything more than turn it on. not
sure if it'll pass through back to you -- that may require ip
masquerade. simple easy test:

as root

echo 1 > /proc/sys/net/ipv4/ip_forward

and see what happens. that should immediately turn on ip forwarding. 

because you're already behind a router (firewall too?) you don't need
any other bits so that may be enough. 

you should google on this subject a bit.


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