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I've done plenty of setups with DSL, dialup and fixed wireless ISP's, but very little with cable modems. A friend of mine called to have me come over and check out his setup since he is out of town and his wife was there for the install.
I'm stumped on this problem though New install of AT&T Broadband using Surfboard 4100 on Windows XP. The DHCP, DNS and NetBIOS over TCP/IP services are enabled as well as the NIC configured to obtain an IP by DHCP.
The NIC cannot obtain an IP by DHCP and Windows returns that it is unable to contact the DHCP server. I have released, renewed and repaired the NIC as well. The only IP that gets assigned is in the 169.x.x.x range, which I believe is the default that Windows assigns when it is unable to obtain from an external DHCP server. I have un-installed and re-installed the NIC (3com) and verified that all it's settings. Also tried straight-through and crossover.
The funny thing is that the technician could get to the internet with his laptop connected to the cable modem and able to get an IP with no problem.
Any ideas? Could this be the residual effects of ZoneAlarm? He did have this application at one time but un-installed it. I do know that ZA tends to leave a bunch of stuff laying around after an un-install.
Unplug the cable modem for awhile then replu it in. The cable companies use the mac from the cable modem then the next downstream mac address for verification. Quite possibly when the tech hooked his laptop to the cablemodem that is the mac that got registered behind the cablemodem. By turning the cable modem off for sometime it should reset itself and register itself and the pc nic with the ISP.
IP address reservations are set by associating the IP with a specific MAC. Does the SB 4100 act as a bridge or does it get assigned the IP address. The tech may have forgotten to give the NOC the customers MAC if the modem is a simple bridge.
I have all the money I'll ever need...... if I die by 4 this afternoon - Groucho Marx
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From looking at the paperwork it appears the tech did write down the MAC address and from talking with his wife he did call it in. I don't know if the 4100 is configured as a bridge or not
Basically your saying if the MAC is not registered on the network the modem will not assign the NIC the WAN IP?
Had this same problem when I got hooked up. The cable tech had me take the nic out and uninstall all drivers then reinstall everything. It worked for my problem...
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Yep. I would never accuse one of my installers (including myself) of NOT making a mistake. Good lord, I can bungle with the best of them. Might want to have them call their ISP's support line.
I have all the money I'll ever need...... if I die by 4 this afternoon - Groucho Marx
When I think of those whom I respect the most, you are there.....serving them drinks.
I have found that sometimes turning auto ip off will then allow the machine to pull an ip...If you are using win 9x on your cd under tools then msutil you will see a file called something like ipac_off.inf right click to install it and turn off ip auto config options.if that dont work use the other file to turn it back on.
Originally posted by chpalmer Had this same problem when I got hooked up. The cable tech had me take the nic out and uninstall all drivers then reinstall everything. It worked for my problem...
I have seen this work many times when you are having a DHCP server problem with cable modem.
Your modems mac wont even sysn up with your isp's network if the mac is not entered.So that cant be the problem.A high pass filter on the pole will prevent you from getting an ip but it will also sometimes more often not allow your modem to sync up at all.
your sb 4100 has a web config pag check the stats @
it will give you all your cmts configuration and your carrier/noise ratio and things like that.but i really doubt that is the problem.
the last post said remove all networking options wich is a really good idea.that does sometimes work.if it dont try turning off auto ip.And if you use aol 7.0 remove all the wan,vpn and their adapters and protocols.Sometimes i find that to cause issues when im doing installs.
New install of AT&T Broadband using Surfboard 4100 on Windows XP. The DHCP, DNS and NetBIOS over TCP/IP services are enabled as well as the NIC configured to obtain an IP by DHCP.
