Bridging wifi to ethernet

[Douglas Phillipson]

Les Mikesell wrote:
> On Sun, 2006-02-05 at 11:25, 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?

Thanks

Doug P