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[Modem] Using Linksys router with SpeedStream 4100 B

When you said everything is working fine with just the computer plugged into the modem, let's assume the following:
modem - doing the PPPoE login
computer - on DHCP

Now, try to reset your Linksys router, to bring back the factory default settings (to simplify things as we don't what got changed).

Turn of the computer, and plugged it into one of the router's LAN port. Turn the computer on.
You must be able to access the router's config GUI through 192.168.1.1. Make sure it's set to DHCP and MTU to 1492.
That's all you need to do, then save the settings.

Now plug the router into the modem. You should be set to go.

Once everything is working, you can now change the router's password, and other things you like to change.

Hi AlphaOne,

I just got home after 6 hours trying all different variations of setup. I need to get some food and sleep.

Yes, the modem is doing the PPPoE login and the computer is basically setup to automatically detect settings. As I recall the 4100B assigned the computer IP to 192.168.1.64. Connecting the computer directly to the modem worked perfectly.

On the router, I assume I should NOT select PPPoE and NOT put in the username and password? The default should be "Obtain an IP address automatically." Should I just leave the default modem IP address, 192.168.1.1, alone too? You are right, I should try to do a hard reset on the router. The router was working perfectly with the cable modem, so I thought it would be easy just hooking it up to the dsl modem.

I have to look around for the MTU setting... in the Advanced section. I don't think it was ever changed. What does MTU do anyway?

Yes, set your router to obtain ip automatically. And it's ok to set the router's LAN ip address to the default 192.168.1.1. You can change that later, if you need to.

With AT&T DSL here in CA, set the MTU to 1492 (instead of the default 1500) because of the overheads. Not sure where to set this with the BEFSR41W though.

reply to CC

reply to CC
I can say from experience that AlphaOne's instructions are correct. I have setup two DSL connections using a Linksys router and both were setup like AlphaOne suggests.

Do NOT set the connection type to be PPPoE as helper2007 suggests.

One other thing, after putting the Linksys in between the modem and your computer, can you access the DSL modem (192.168.0.1) and if so, check to see if you're logged in. If you see a login screen, enter your username and password for the DSL account.

reply to CC
Okay I need some help from the experts. Basically identical problem that CC described.

I have a Linksys WRT54G v2.0 that I have used without issue for several years with a Speedstream 5360. The 5360 died (the dreaded all leds - except power - blink). I ordered a Siemens 4100b to replace it.

Short story - plug the ethernet from the new modem into a computer; works like a charm. plug the ethernet into the router; nada.

Longer version - With PPPoE on the modem and the router set to DHCP the router status page shows what looks like reasonable WAN IP and gateway addresses. The DNS gets set to 192.168.0.1. DNS resolution doesn't work and I can't ping internet addresses (using dotted-quad) from PC.

With PPPoE on the router, again the WAN IP and gateway addresses look reasonable. I get 2 DNS server addresses that look reasonable. DNS resolution does work, but I still can't ping internet addresses.

At this point I suspect either the modem is specifically preventing the packets from reaching the internet (detecting that there is a router/NAT) or that there is some low level issue between my version of the linksys and this modem. By the way, I have the firmware for my hardware version of the WRT54G - I beleive it is 4.21.

Any suggestions welcome.

--Jeff

This set up method doesn't work?»/faq/12670

reply to AlphaOne

reply to codemonkey2
If the setup outlined in the FAQ that d_l gave you doesn't work, with the modem doing the PPPoE, try doing a hardware reset on the Linksys and then configure it again.

reply to d_l

Router Status

reply to tonydi
I'll give it a try tonight and let you know how it goes...

--Jeff

reply to codemonkey2
Do you use a software firewall such as ZoneAlarm or XP's firewall? Those programs must be configured to trust the modem's IP at 192.168.0.1.

Also your router's subnet mask should be set to 255.255.255.0. Edit: This is for the LAN setting.

You might try setting the login type to static IP (instead of automatic) and:
192.168.1.64 for the IP address
255.255.0.0 for the subnet mask
192.168.0.1 for the default gateway
192.168.0.1 for DNS server.

Not sure if that will make a difference though, but some Linksys routers have an appearance of "locking up" when receiving the DHCP address from the modem if the public IP passthrough is used. It takes 10 minutes of waiting or a modem reset to fix this.

reply to codemonkey2
Make sure you change the routers default lan IP address to 192.168.2.5 and reboot all computers using DHCP.

Wan Lan Settings

reply to CC
Okay, I just did the hard reset. It worked. After the reset the only thing I changed were the routers LAN IP - 192.168.2.1 - and disabled wireless. The default login type was DHCP (on the linksys) so I left that and power cycled the linksys and all PCs. Then I power cycled the modem. From a PC I was then able to get to the modem's admin page and ping internet addresses (and do name resolution - DNS).

If I run across a setting in the router that causes things to break, I'll report back.

--Jeff

Here's some FAQ's on the modem
Where are the Line Stats in a 5100b or 4100
Explaination of the lights on the Speedstream 4100 DSL modem
What the hell is PPPoE anyway

--
God bless our troops

reply to codemonkey2
--- Never mind, I re-read codemonkey2's last post and it looks like he got it solved.

So, I am having some similar problems.

now using a linksys with tomato running, pppoe on the MODEM and DHCP on the router.

question is, the modem requires the authentication to be ACTIVATED, meaning, if the modem resets, or power fluctuates, one has to go into the modem and CLICK, CONNECT. Is there any way around this? I go away for periods of time, and would normally have the pppoe on the router, but that hasn't seem to work at this new address.

Did you select"Always Attempt to Connect" in the Connection Configuration tab?
--
Got a Clark,Crown,Drexel forklift and need technical advice? Ask me about it.

reply to tivoboy
Are you certain that only one device is set to do the PPPoE?
2 devices set for PPPoE can cause problems like you describe in your other thread.

The modem has 3 connection types:
Smart keep alive it will keep the PPPoE session alive until the ethernet link goes down. When the ethernet link is up a PPPoE session is started/maintained. This is the default connection type and it works well with a router.
--
God bless our troops