Bridging wifi to ethernet

Douglas Phillipson douglas at
Sun Feb 5 21:28:29 UTC 2006

Les Mikesell wrote:

>>>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.

My wifi interface is eth1 and will pull an address from the library, 
wired is eth0.  Do I give my eth0 interface a 192.168.0.x address?


Doug P

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