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DHCP Problem!!!

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by wjchoi

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We have recently moved DHCP Server from Cisco switch to Windows 2003 Server. DHCP server seemed to be working fine in the beginning, but every morning some users, who receives dynamic IP address, are having problem. Users with problem are running WinXP, and they can't ping dhcp server or other servers, and can't find printers as well. Servers are all configured with static IP, and printers are all network printers with static IP address. Approximately 10 people are having problems everyday, and I can't figure out why they have problem every morning. There is another server that is replicating from main DHCP server, and we have secondary DNS server as well. Please HELP

10 replies

by cg it

if they can't ping it, there is no connectivity to it so I'd start there in troubleshooting.
What does the event log on the server hosting DHCP show?

note: you can only have 1 DHCP server on a segment.

by wjchoi

Well. It seems like users who shut down their computer before they leave are having problem. They don't have connection in the beginning, but when I do ipconfig release and renew, then they sees DHCP server and they are able to use network sources accordingly.

by robo_dev

Did somebody forget to disable DHCP on the Cisco switch?

The first thing to check is what IP address are these users getting if they cannot ping the DHCP server? 169.x.x.x is the Windows failover address. If it's anything else, you have rogue DHCP server.

by wjchoi

Users are getting dynamic IP from DHCP with 192.168.0.x, and servers are statically configured with 192.168.150.x. There is only one server with DHCP service running, and another server replicating scope. Even when they can't ping to server, they still have correct IP address, and release/renew still gives them same IP address.

by cg it

ah it's one of those 20 question reject all answer types.

dude, no connectivity... DHCP discover, ack offer messages aren't happening. clients effected either aren't receiving DHCP aren't getting to DHCP.

Start there.

by wjchoi

Thank you for response. I am rejecting answers/comments, because I have tried more that what's been suggested here prior to asking questions, and none of the comments seem to be working. All access between server vlan and workstation vlan has been granted on switch behind ntfs security, and I just can't see why services in dhcp server shows running, while it is not actually working. And it is so random that 80-90% of users seem to work even after they reboot their computer, while those with problem do the same. We are not really big company which might cause problem due to number of user limit on OU. NetBIOS/LMHOST is disabled, as well as WINS to eliminate any confusion.

by icb's corner

How can be replicate a DHCP server? If you have the same scopes then something is wrong in this picture. You can configure 2 DHCP server in 80/20 mode but not the same scopes.

by cg it

now you bring up VLan's in your comment. You should have mentioned you VLan's your network in your opening question. Not just mention a Cisco switch.

If you have a Cisco 2900 series switch then you should know about DHCP and VLans and whether DHCP messages can cross VLan boundries without any configuration of the switch or use of a DHCP relay agent.

The answer above poses a great question. You can't replicate DHCP scopes. You can only have 1 DHCP server on any given subnet. you can create a superscope which covers more than one segment however, just mentioning replication of a DHCP scope says one of two things. You don't know or your jerking our chains.

this is why most don't even come to the Q&A boards anymore.

by mike_albelo

I have just setup a basic Windows DHCP Server and having similiar issues with it. It seems that some users are getting everything but the Default Gateway from the DHCP Server. If a Release and Renew, it gets the Default Gateway. Only seems to happen on some systems. Now I do have to mention that I do have (2) Cisco 2950. And now that I'm writing this, I need to check and see if the users that are having the problem are on the same switch. One of them was just installed.

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