dhcp - cable modem problem

[pkcom]

I would appreciate any insight anybody may have with respect to this problem....

My laptop running nt4.0 workstation was set for dhcp and my cable modem access was working fine.

I was having trouble networking a couple of win95 workstations to the laptop so I removed tcpip from the laptop in an effort to troubleshoot the problem.

Afterwords I added tcpip to the laptop so I could use the cable modem again and now it's not working !
It's set for dhcp and tcpip is bound to the xircom ethernet adaptor. When I run "ipconfig /renew cem561" it takes a while and then I get the response "dhcp server unavailable".

I believe the problem is with my laptop as the cable modem works fine with both of the win95 workstations. I can release and renew the ip address with no problem.

I had made an emergency disk for the laptop from a time when it worked with the cable modem however I don't have the setup disks or nt4.0 cd as nt was already installed when I "inherited" the laptop at work.

When I add tcpip it looks for the nt cd and since I don't have it I direct it to the hard drive where it finds most of the required files are already installed.

I tried running a sniffer called "hoppa" on it while connected to the cable modem and it shows that packets are being received but when I try to stop the analyzer to look at the data I get access violations at memory locations. I have to assume the packets received contain the temporary ip address.

I'm pretty sure I'll need the setup disks and/or the nt cd to resolve this problem but as I don't have these I'm hoping someone has another solution.

Thanks !

 

[fenris]

You'll probably need the NT cds.

What does ifconfig say when you run it? Is the cable modem internal? If it is external who are you connected to it?

Are you sure that the dhcp settings are correct?

 

[mmoonshi]

Simple problem. Reset your cable-modem and wait for it to reinitialised then make sure you bind your tcp/ip to your ethernet card and repeat the "ipconfig /renew" command.

--Moonshi
moonshi@linux.com.sg

 

[pkcom]

Thanks for the suggestion but I had already tried this.
I don't think tcpip is installed correctly which is what's causing the problem.

When I issue the ipconfig command it shows no ip address for the xircom adapter. If I issue the ipconfig with renew it tries but comes back indicating it's unable to reach the dhcp server.

I guess I'll have to wait until I can get hold of an NT 4.0 cd.

 

[dxd]

I have a cable modem as well and have run into the same problem when alternating or using multiple machines connected to a hub with the cable modem attached.

What I do when this occurs (it always works for me) is to shutdown any other units on the same hub, then power off (or unplug if no on/off switch) the cable modem. Turn the modem back on and let it initialize. Once complete, turn on the NT computer and see if it gets an IP assigned.

My issue actually occurred on a W2K unit....but it sounds really similar.

 

[RichardMoran]

Just a thought, but having added tcp/ip to your laptop, did you re-apply the current service pack?

If it looking for the NT CD to install files, you MUST re-apply the service pack to avoid these bizarre networking problems.

Rik

 

[pkcom]

Thanks Rik, that's a good suggestion, I'll give it
try.