G54S with motorola surfboard sb5101 -> router can't get DHCP from cable modem

[zoparrat]

   

My ISP is roadrunner and I have a motorola surfboard sb5101 cable modem. I can connect to internet if I go directly from my computer to the cable modem.

 

When I connect the cable modem to the WAN port of my buffalo g54s, it can't resolve a dhcp server when I set it to "obtain dhcp automatically". It spends a long time trying to, and the admin login window pops up asking me to login again and again.

 

Any ideas?

[zoparrat]

   Also, would I need a crossover cable instead of the regular ethernet cable for the connection from the modem to the router?

[Paul]

No cross over cable is needed, please connect the modem to your router, then power cycle everything.

If that does not work then please set the router up for PPPOE

[savoylen]

   

PPoP is not an option for me... so any other ideas?

 

I noticed that they use a different subnet mask... should that throw off the search for the dhp?

 

Thanks! Sav

[slpip]

   Make sure the modem and the router do not use the same IP address.

[slpip]

   

I would use the DHCP dynamic for the router with IP address different from the modem.