VLAN Bridging WAN and a LAN port

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For WRT54GS v2

If your ISP gives you multiple public IPs, and you want to hang a second router or other device on your main router with direct access to the WAN, fear not, it's easy:

Your original VLAN should look like this (among other lines) if you run the command nvram show |grep vlan

vlan0ports=1 2 3 4 5*
vlan1ports=0 5

So the following commands move LAN port 1 to the WAN VLAN:

nvram set vlan0ports="2 3 4 5*"
nvram set vlan1ports="0 1 5"        
nvram commit
reboot

That's it. No firewall rules or bridging needs to be set up. Port 1 is now a direct WAN port, and your second router/AP/server can use one of your extra public IPs.