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NT4 DHCP client recieves no Gateway

By LordInfidel ·
I've been researching this issue for a while and have not been able to find any MS KB articles about it.

Basically, on my LAN, I have a mixed MS OS enviroment. I have several DHCP servers (NT4 srvr) handing out leases for a /25 block. All leases are for 24 hours and contain the generic IP/Mask/Gtwy/DNS.

The problem is most of My NT4 wkstn DHCP clients are not receiving the gateway as part of their lease. This has happened in the past and is generally more prevelant right after a IP Netwk address change.

After the last change over though it has become a daily occurence and is getting quite annoying.

2K and 98 clients have not issues receiving the full lease. The NT4 clients that experience this do not share any common switch. Some come in directlty into the noc to patch panel then into a switch. Others pass from switch to noc patch panel then into switch. We have multiple switches in the noc that connects the network together.

We are not using spanning tree on the switches.

Any ideas?

(originally I've changed out adapters thinking it was the adapter, I've re-run new drops.... I've stopped trying to fix it once I realized that the machines it was happening to were all NT4 wkstn's.)

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NT4 DHCP client recieves no Gateway

by chinl In reply to NT4 DHCP client recieves ...

In DHCP make sure the global scope has the service "router" set with the value of your gateway

Couple of things may cause the problem if the above is OK.
1. Locally set gateway will negate the gateway setting from the DHCP server.
2. It may be picking up the IP from another DHCP server without the "Router" set

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NT4 DHCP client recieves no Gateway

by LordInfidel In reply to NT4 DHCP client recieves ...

The scopes on both DHCP servers are correct. Of that *was* the case then All OS's on my lan receiving leases from the offending server would be incorrect.

This is not the case.

Only NT4 wkstn's are receiving incorrect leases. And they are not all being recieved from the same DHCP server. If they were coming from one server then I can say it's that server. But it is coming from both servers.

Also notable, we do not allow typical LAN traffic past the firewall. So picking up a lease from another network is not an option.

1 more thing... The IP and Mask are correct in the lease. It is just that it is not receiving the gwy. And there is no manual gateway set on the client machine.

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NT4 DHCP client recieves no Gateway

by gperrie In reply to NT4 DHCP client recieves ...

Hi

An ipconfig /all at a command prompt should tell you the IP of the DHCP server the lease was received from. You could double check here to be sure which server hands out the address.

If you do a manual ipconfig /release then ipconfig /renew, does it get the correct settings?

Are all the workstations on the same SP level? Which level are they at?(I sound like Microsoft - We can't help if you haven't installed the latest SP)

Gavin

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NT4 DHCP client recieves no Gateway

by LordInfidel In reply to NT4 DHCP client recieves ...

Thanx..... But I have already gone thru the basics.

They are not locked down to 1 specific dhcp server. It is a NT4 wkstn issue receiving leases in a switched enviroment.

I just don't know why.

All systems are sp6a.

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NT4 DHCP client recieves no Gateway

by LordInfidel In reply to NT4 DHCP client recieves ...

I have changed the points to 2K.

*****Please Note*******

While a appreceiate the last 2 posters responses.
I am an extremely seasoned admin and have gone thru all of the basics. My counterpart at the company who is even better than I am, is unable
to figure this one out.

I am looking for any article that describes this issue. Not troubleshooting tips.

Local lan is a switched enviroment with cisco catylsts. However some machines are going thru Intel 140T hubs.

There are 2 dhcp servers, both NT4 srvr sp6a. With all hotfixes applicable to our enviroment.

This ONLY happens to NT4 wkstn clients. It does not matter where they are located in the building.
It does not matter which srvr they get the lease from.

Please, while I appreciate the attemps at helping, Please only submit Viable answers that attempt to address this issue.

Yes, I have put a sniffer on this to see what is happening.

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NT4 DHCP client recieves no Gateway

by NathanH In reply to NT4 DHCP client recieves ...

If you have access to CISCO TAC:

http://www.cisco.com/warp/customer/473/100.html#16

It is likely to be something with a NIC/switch conflict with the NT machines that is affecting the DHCPOFFER packet from the DHCP server.

Good Luck.

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by LordInfidel In reply to NT4 DHCP client recieves ...

It really never did help, but it was the more intelligent of the answers.

Since the netwk infrastructure has long been renovated, and all wkstn's/servers upgraded. This is a moot point and the question should of have been killed a 2 years ago.

It will remain a mystery.

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NT4 DHCP client recieves no Gateway

by LordInfidel In reply to NT4 DHCP client recieves ...

I have not forgotten about my question and am still researching it.

I have read the cisco tac but have not had a chance to research it further.

It's way down at the bottom of the list.

When I get back to it I will award if warranted.

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NT4 DHCP client recieves no Gateway

by shmaltz In reply to NT4 DHCP client recieves ...

Look up the follwing (remove spaces):
http://support.microsoft.com/default.aspx?scid=kb;en-us;167049
The above explains that NT is the only MS OS (it doesn't mention XP) that will not accept a gateway that is not on the local subnet. If your Gateway has an address that is not on the local subnet WinNT clients will not accept it.
I believe the next one doesn't apply to you, however I think that I should add it just in case someone else is researching this problem and is looking for a solution:
http://support.microsoft.com/default.aspx?scid=kb;en-us;249003
This one explains a situation where a client receives set the Gateway to the same address as the IP address, MS says it has to do with the switch.
Hope this helps.

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NT4 DHCP client recieves no Gateway

by shmaltz In reply to NT4 DHCP client recieves ...

I believe if this is the problem then the only workaround would be either to setup a gateway that is local, or to add a gateway using the Route command with if.

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