Desktop

Ask something
Discussion Locked

TCP IP HELL

0 helpful
22 replies

by admin

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

Have 4 pc's , various makes etc. all dead on getting ip adress from DHCP on NW5 server running DHCP. Rest of network fine 100% login adress lease & renewing etc. These four cannot ping except for loopback, removing drivers & re-installing no go. same for re-installing clean windows ( except data folder on root with work docs & *.pst)
Lights active on NIC and on hub where line terminates.

What am I missing?

22 replies

by some guy in seattle

Are you using a switched hub? If you have a 10/100 hub, and the DHCP server is running on one speed, your 4 PCs on another, then they will not be able to communicate across the hub. If so, try to force them to the same speed. Sounds like your TCP/IP settings are fine on the machines themselves since you can get loopback.

Hope that helps,

by admin

Sorry, Some Guy,

Didn't mention this but am still running 10 hub and hte nic's are 10 as well. But thanks for the tip I'll remember that when we upgrade.

by steed

I agree with the first answer except you would get loopback even if the front end of the IP address was wrong so double check your IP addresses and subnet mask.

by admin

Have done so, 2nd thing I checked after looking at nic for lights burning, sturggled with a pc once for 1 hour before I checked the cable.....NEVER AGAIN

by leastar

Have you installed the hosts/lmhosts files? Have you entered the Default Gateway? Are these PC's all in the same area? How is the hub connected to your network (fiber, another line to server room)? Any more PC's on this Hub? Are these Win95/98 PC's? If so, check in Device Manager that the NIC card is not disabled. When you did a "clean" install did you remove the NIC card first, then add it after windows complete so it would detect? These have helped me in working on 95/98 machines. NT/2000 have different "quarks". Make sure to use the restore CD that came with the PC on these. I've had problems when I didn't.

Good Luck!

by admin

Why do I need hosts/lmhosts?
Gateway entered.
Most in same general area, but share hub with most of rest of co. Hub linked to pc's and server

Win95 on pc's. Nic's not disabled. Will try remove and add after win installed? see what happens.

by qhcomputingny

Are the NIC Cards in those systems, the same as the ones that are working correctly? If not, try replacing them with the ones that have been working fine. I have had the same problem, using Emachines with the factory NIC cards. BTW: Don't use Emachines. Probably the worst computers I have ever encountered.

by admin

Nic cards are different type and were all working. till monday that is. have swopped nic with another one still not working, error 10091 when pinging 127.0.0.1?

by jminshal

What is the OS on the clients? NT's Client Services for Netware might have to be installed on the clients to allow them to access a Netware server if they are NT clients.

by admin

Don't even get to installing NW client, as soon as windows is up and tcp/ip is installed I get unable to obtain a IP adress from DHCP server

by stillatit

If you carry one of these computers over to a working computer, and move the cable from the back of the working computer to the broken computer, does it work? It is possible that the hub is actually bad, or that a connection from the hub to the nexthub in line is bad (or the uplink switch if set wrong).

Are there working stations on the hub?

If you give one of the broken stations a static IP address, does it then work? Can it ping other stations on the same hub?

If you swap a NIC in aworking computer for a NIC in a broken one, does the problem go away?

Do you have or use, anywhere in your shop, a utility to change the MAC address on NIC cards? If so, use WINIPCFG to check the MAC address of the card on each bad machine, and make sure they are unique on your lan.

Good luck.

by admin

Am currently busy carrying around, other pc's share hub and work, except for these few.

Will check MAC adresses though

by mikel~t

Is the DHCP scope full?

Are there only 4 computers on the hub you mention, or are there other machines connected to that hub that work fine?

Try manually assigning an IP address from your subnet (preferably not a server IP), and see if you can ping any other ip numbers on the subnet.

hope this sheds some light on the situation.

Mike

by admin

DHCP scope is not full , full class c range, with some reserved ip's.

The other pc's working of the hub are fine, quite a lot of other pc's...

T4ried the manual ip adress from dynamic and exluded range on dhcp scope , no joy

by mm212

I'd be looking at the hardware, easiest first. Swap locations of workstations. Move a known working WS to the spot where one of the problem WS's was.

Where does the problem go?

Does it follow the workstation? You probably have a network card problem.

Does it stay with the location? Start checking the cabling.

When checking the Network cables, start with the stretch from the patch panel to the switch (or hub). Even if it looks ok, change it and re-test. Still a problem? Could be the wiring in the walls or the actual CAT5 wall plug.

by admin

Ended up being a problem in the hub,

I have a IMC Etherway which is modular in design, so first thing to do would be to check cabling. I was lazy and checked lights on nic and hub where working, both sides were. All 5 lights on hub's module were green and nic on machines were green as well, so I assumed wrongly that the link was fine. I even saw network activity on the nic's with secondery led's flickering etc. Looks like the module created a sort of closed circuit for those w/stations linked to it causing the network activity as they tried to get ip adresses etc. etc.

Once I moved the cables from that modules ports to another module the problem was solved.

Kudos to Stilatit. You gave me the direction to go in.

by bohicam1

have you checked licensing? Perhaps your NW server has the full amount of connections allowed. I know I am reaching here but it seems like you have tried all other options.
Good luck!

Mike

by admin

Ended up being a problem in the hub,

I have a IMC Etherway which is modular in design, so first thing to do would be to check cabling. I was lazy and checked lights on nic and hub where working, both sides were. All 5 lights on hub's module were green and nic on machines were green as well, so I assumed wrongly that the link was fine. I even saw network activity on the nic's with secondery led's flickering etc. Looks like the module created a sort of closed circuit for those w/stations linked to it causing the network activity as they tried to get ip adresses etc. etc.

Once I moved the cables from that modules ports to another module the problem was solved.

Kudos to Stilatit. You gave me the direction to go in.

This discussion is closed to new replies.