Installed WRT54G2 With ATT Motorola DSL and cannect to internet. dsl worked fine before installing the Modem had AT&T recheck the dsl and was configeration correct was advised that my problem in the modem...

Hi there ...

your isp is at&t? please verify the ip address straight to the modem if its is 192.168.1.1 and if your modem from your isp is set to DHCP or BRIDGE mode.

IF IP address is 192.168.1.1 (DHCP)
... change the LAN IP address of the router to 192.168.2.1 or 5.1 to prevent any IP conflict
by doing this :

1. access setup page of router usually 192.168.1.1
2. under setup tab look for the ip address, change it, then save
3. click on the status tab , and look for a VALID ip address

IF MODEM is set to BRIDGE mode
.... please ask username and password from your ISP coz we would need to set your router to PPOE...
1. access setup page
2. under setup tab look for INTERNET CONNECTION TYPE
3. select PPPoE
fill in username and password
select "keep"alive
save
4. click on status tab
look for LOG in TYPe ===> click CONNECT
if connected : check a valid IP address
if authentication failed verify again your username and password from your ISP

Goodluck!