LAN problems

[Sephiroth]

ok.., can anybody tell me if I'm completely overlooking something obvious here?

I have a dsl modem, a router, and two PCs. They're setup as follows:

DSL Modem:

IP = 192.168.1.1
Subnet = 255.255.255.0

Router:

IP = 192.168.1.2
Subnet = 255.255.255.0

PC 1:

IP = 192.168.1.3
Subnet = 255.255.255.0

PC 2:

IP = 192.168.1.4
Subnet = 255.255.255.0

I'm trying to troubleshoot my dsl connection to see why it's going so slow, but, here's where I ran into my problem. If my router is in the middle between my modem and my machines, then I can see the modem and connect fine. But, if I take the router out of the equation, and just run a straight CAT5 cable between the nic in my machine and the ethernet port on the dsl modem, I can't connect, ping it, do anything, and I can't figure out why. I've tried reseting the modem to factory defaults, and tried giving it an IP and Subnet of 10.0.0.138 / 255.0.0.0 , and my pc an ip / subnet of 10.0.0.1 / 255.0.0.0, but neither helped. On one hand, I was thinking my router was the reason my connection was going so damned slow, but now I'm starting to wonder if my modem is being cranky and doesn't want to work right now. Any ideas? if I'm overlooking something obvious I'm going to smack myself, lol

[kamikazee]

I had the same problem, Your ISP may not be picking up the mac address of your NIC fast enough. They (adelphia) said they were using cisco routers and that sometimes it could take upto 3 hours to reconfigure everything. Adelphia not only looks for the Modem mac ID they also look for a NIC ID.

[mikeh420]

Before I put in my router, I would set the modem to 10.0.0.138 and the PC to 10.0.0.137. After I got the router (Linksys BEFSR41) the modem's IP was left as it was, the router was 192.168.1.1 and the PCs (2) started at 192.168.1.100 (with a 255.255.255.0 subnet). You might try to change the modem back to it's original addr.

Hope this helps.

[unicorn]

Aren't your ISP giving you an IP using a DHCP? Then your router has taken care of that and connect your internal LAN with the cable modem. Putting the PC in direct connection with the modem make them belong to different networks.

[just_do_IT]

Had to think a bit, so am re-writing this post.

My ADSL requires my mac address to connect, as most do. Routers have mac addresses as well. So when you connect directly to the modem from your machine, you are using the nics address instead of the routers.

Therefore you should not be able to connect.

Question though. You mention you are changing the modem address. How do you change a modem address or are you referring to your router?

[Sephiroth]

Quote:

Originally posted by kamikazee+Jun 13 2003, 10:46 PM--></span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (kamikazee @ Jun 13 2003, 10:46 PM)</td></tr><tr><td id='QUOTE'>I had the same problem, Your ISP may not be picking up the mac address of your NIC fast enough. They (adelphia) said they were using cisco routers and that sometimes it could take upto 3 hours to reconfigure everything. Adelphia not only looks for the Modem mac ID they also look for a NIC ID.[/b]

Quote:

Originally posted by -trminatr@Jun 14 2003, 10:40 AM
Had to think a bit, so am re-writing this post.

My ADSL requires my mac address to connect, as most do.&nbsp; Routers have mac addresses as well.&nbsp; So when you connect directly to the modem from your machine, you are using the nics address instead of the routers.

Therefore you should not be able to connect.

Question though.&nbsp; You mention you are changing the modem address.&nbsp; How do you change a modem address or are you referring to your router?

you can change the ip addy and subnet that the modem is assigned in it's config pages

i thought about the mac address thing too, but, if that was the case, then explain this:

before i got the router, it was connected straight to my machine, then shared over a second nic in my pc over ICS or Wingate, to PC2, and when it was connected that way, i didn't have this problem

also, if it was allowing access to only the mac address of my router, then, why when i take the router out of the equation and push the button on the modem and reset it to factory defaults, can i still not do anything with it?

Quote:

Originally posted by -mikeh420@Jun 13 2003, 11:41 PM
Before I put in my router, I would set the modem to 10.0.0.138 and the PC to 10.0.0.137. After I got the router (Linksys BEFSR41) the modem's IP was left as it was, the router was 192.168.1.1 and the PCs (2) started at 192.168.1.100 (with a 255.255.255.0 subnet). You might try to change the modem back to it's original addr.

Hope this helps.

what modem do you have, an Alcatel speed touch home? that's what it sounds like, same one that I have

<!--QuoteBegin--.unicorn@Jun 14 2003, 09:54 AM
Aren't your ISP giving you an IP using a DHCP? Then your router has taken care of that and connect your internal LAN with the cable modem. Putting the PC in direct connection with the modem make them belong to different networks.[/quote]

not DHCP, just a dial up PPPOE connection

[Zone-MR]

What IP is set as the gateway and DNS servers on your main PC?

If its 192.168.1.2 you might want to kick yourself very hard in the nuts. If its something else, tell me what it is, or is is set to get it via DHCP?

[Sephiroth]

the gateway is either setup to 192.168.1.2, when the router is attached, or 192.168.1.1 / 10.0.0.138, the modem, when it's not

the dns servers are two of my isp's dns servers hard coded, not getting anything from dhcp

/me waits to get off work so i can go home and try to fix this again, any more ideas?

[billybob3]

Why do you have your modem IP set to a local IP? Wouldn't you want this to be something available to everyone, so that you could connect? Am I making sense? Try kicking yourself in the nuts like Zone-MR mentioned.

[Sephiroth]

Quote:

Originally posted by billybob3@Jun 14 2003, 12:49 PM
Why do you have your modem IP set to a local IP? Wouldn't you want this to be something available to everyone, so that you could connect? Am I making sense? Try kicking yourself in the nuts like Zone-MR mentioned.

it has to have a local ip too......... it, or my router, only gets a public ip from my isp when i'm connected