I am trying to setup my WRT54GS to connect to a wireless AP and to also use the WAN/Internet port on my broadband connection so that I effectively have to internet connections going into my router. 

I have setup the firewall to forward all outgoing traffic in the upper TCP/UDP ports out the WIFI and the rest out the WAN. 

Everything I thought works fine until I went to plug the router into my cable modem... it is configured to get DHCP from my ISP, but when I call "ifup WAN", it doesnt get an IP. 

I have setup:
vlan0 to be ports "1 2 3 4 5*"
vlan1 to be ports "0 5"
set wan_ifname="vlan1"
set lan_ifname="br0"
set lan_ifnames="vlan0"
set wifi_ifname="eth1"

and the firewall should route between. 

I'm not exactly sure what the purpose of "br0" is?  What is the difference between a bridge and a vlan?  Should I just set lan_ifname="vlan0" and leave ifnames blank?

I can connect to the wireless and route traffic between it and my LAN, but I cannot connect the WAN (port 0).  I assume on this router, port 0 is the "Internet/WAN" port right?

Its like it just doesn't want to get an ip from my cable mode.

I imagine many people have done this before so if anyone has, please help.

br0 - bridge together interfaces set up in *_ifnames variable since you have just one interface vlan0 there is no use for it and yes you should set lan_ifname="vlan0" and leave ifnames blank

Thanks for the reply.  It turns out my problem was that on my WRT54GS Version 4.0, ports "0 1 2 3" are the 4 LAN ports on the back of the router, and port "4" is the WAN/Internet port.  That means the default configuration that the OpenWRT documentation provides with vlan0="1 2 3 4 5*" and vlan1="0 5"  makes the physical WAN port the port labeled 4.  So my guess is that...   

VLAN/Swith Port 3 = Labeled port 1
VLAN/Swith Port 2 = Labeled port 2
VLAN/Swith Port 1 = Labeled port 3
VLAN/Swith Port 0 = Labeled port 4
VLAN/Swith Port 4 = Labeled WAN port

Although the only one I can verify right now is that the WAN port is actually VLAN PORT 4 and I think that VLAN PORT 0 is the Labeled LAN port 4.

I discovered this after verifying everything again and again and looking through all the scripts and seeing nothing wrong.  Then it just dawned on me the most logical reason I couldnt get an address from the DHCP is that it is not plugged in.  I tried every othter LAN port, and when i plugged in port 4 (I think it was) I got an IP from my cable modem.  Before that, I saw that when I plugged in to my WAN port I could still connect to the router and get an IP from the routers DHCP.  So when I switched the vlans so that
vlan0ports="0 1 2 3 5*" and vlan1ports="4 5", everything worked as labeled and expected. 

Oh well... maybe it will help someone else out.  I did just  buy the router new less than a week ago so maybe something physical has changed... or maybe I'm just a dipshit and misread somewhere that port 0 is supposed to be the WAN port.

(Last edited by jkhax0r on 2 Dec 2005, 17:54)

http://forum.openwrt.org/viewtopic.php?id=2711

- DL