efflandt
join:2002-01-25
Elgin, IL
 ·AT&T Midwest
| reply to sharpergnome
Re: ADSL2+ Modem With a ADSL router
If a router says it works with ADSL and it is not specifically a modem, that just means that it supports PPPoE. But you would still need a DSL modem to connect to the internet.
Earlier modems were just bridge modems and whatever connected to the modem had to handle the PPPoE (either your PC directly connected to it, or a router).
Current modems are usually modem/router and handle the PPPoE. If you put a router behind that you have to make sure that the LAN side of the router is a different IP range than used on the LAN side of the modem. Even if you have the modem pass through your public IP, the modem might use a private IP as its LAN gateway.
Not sure if that is the speed issue or if it is an MTU issue. PPPoE has an 8-byte header, so it max MTU is 1492. Your LAN may not know that due to the router and assumes default ethernet MTU of 1500, so packets can get fragmented.
If your router has an MTU setting for its WAN, you might try setting that to 1492. Otherwise if the modem was bridged and the router did PPPoE it would likely communicate that to the LAN, but then you might not be able to access stats on your modem. |
