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Configure Buffalo router for DSL w/ ISP authentication

Posted on 2004-09-29
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Last Modified: 2013-12-14
I have a DSL modem and a Buffalo AirStation WLAR-L11-L router (802.11b + 4 wired ports). I want to share the DSL connection between my PC (wired connection) and a handheld (wireless).

The tricky part is that my ISP uses an authentication page. Any website you try to load in will be redirected to a login screen. Once you've logged in, everything works normally until the next day, when they reset it and you have to log in again.

This all works fine when the DSL modem is connected directly to the PC. But once I connect it through the router, it fails. I can get a 192.168 IP from the router's DHCP server, and I can connect to the router's config page. I've verified that the router is getting an IP from the ISP's DHCP server.

I've tried some ping tests -- the PC can ping the router, but nothing else. Pinging outside sites gets me a resolved IP (which isn't just cached, as I've tried pinging sites I've never visited), but the pings time out. The router's config page has a ping test, and it can ping the ISP's gateway computer and the IP of the ISP's authentication page, but nothing else.

I called the ISP, and they said that the above ping behavior indicates that the router needs to be authenticated (makes sense, since router and PC have different MAC addresses). But what I can't figure out is how to get to that authentication page. How can I configure the router to get that far?

I expect you'll need some more info to troubleshoot this. Let me know what you need and I'll post it.
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Question by:jsprad
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public earned 500 total points
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Who is the isp?
Most isps use pppoe and pap/chap for authentication. If your isp uses something else, you will need to contact the router vendor for a firmware update.
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