[onlinespending]

My ISP is Verizon FIOS which provides a modem/router- in-one box, so I'm pretty much forced to use this router. I do however, want to use my ASUS RT-N16 as a Wireless Access Point behind the router.

I followed the DD-WRT wiki guide for setting up a WAP step-by-step, but cannot access the internet from a wireless PC behind the WAP. It does get a DHCP IP address from the router properly, but I imagine there's an issue with the DNS server. This despite setting my router's IP address (192.168.1.1) as the Gateway and Local DNS in the DD-WRT WAP's Setup page.

The WAP's IP address is set to 192.168.1.254, which is outside the router's DHCP lease range (192.168.1.2 - 192.168.1.199).

Here's my output from ipconfig on the Windows client. Is it correct that it's reporting the DNS Servers as the WAP's IP address (192.168.1.254) and not the router's IP address (192.168.1.1)?

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) WiFi Link 5100 AGN
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.1.131(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, January 13, 2011 6:35:58 PM
Lease Expires . . . . . . . . . . : Friday, January 14, 2011 5:27:48 PM
Default Gateway . . . . . . . . . : 192.168.1.254
DHCP Server . . . . . . . . . . . : 192.168.1.254
DHCPv6 IAID . . . . . . . . . . . : 184557917
DNS Servers . . . . . . . . . . . : 192.168.1.254
NetBIOS over Tcpip. . . . . . . . : Enabled

[onlinespending]

I think I may have solved it. One of the options listed in the Wiki is the following:

[Tweener]

That setting turns of nat, so you are not double natted. Apparently you were not single natted until you switched to gateway!