On Mon, Mar 10, 2008 at 11:36:42PM -0700, Tyrion wrote:
I can't see any reason that it wouldn't work, but let me run something
past you guys.
I get my internet via WIFI, I want to set up a machine with a WIFI and
an ethernet to do NAT for the rest of the network in my apartment. Will
there be any issues with NAT behind NAT?
I wouldn't expect any problems with normal basic protocols. It might cause
problems with UDP or things that want reverse connections (active-mode
ftp). It will also increase latency.
But, it might not even be necessary to do this, if the WIFI source is
willing to hand out multiple IP addresses to the same MAC. If you
WIFIðernet machine is configured as a bridge, when clients request DHCP,
they will go directly to the WIFI router and get the request. Essentially,
each machine will act as if it were on the WIFI network.
I'm not sure what distribution you're running, since that will affect
bridging mode. Basically, you need to bring up the two network interfaces,
say eth0, and eth1, and then bring up the bridge interface. At that point,
you run dhcp on that machine on br0, and pretend as if eth0 and eth1 don't
really exist. Something like this:
brctl addbr br0
brctl addif br0 eth0
brctl addif br0 eth1
dhcpcd br0
The utility may be brcfg in an older distribution. It is likely your
distribution will have convenient configuration files to set this up.
You'll also need to make sure that 802.1d Ethernet Bridging is enabled in
the kernel (or the 'bridge' module loaded).
The bridge interface supports the spanning tree protocol, so should deal
with whatever the WIFI router is doing.
David
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