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Help please DHCP problem with windows VIsta

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by willpd13

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Hi All,

I am having a problem with several laptops on our network (about 6-7) all run Vista and are by either Dell or Toshiba. The problem I need help with is that they are rejecting any DHCP address given to the by our 2003SP2 Servers causing the DHCP scopes to fill with bad addresses. This problem is similar to http://support.microsoft.com/kb/928233 but this has not halped to stop it and only applied to non microsoft DHCP servers. Thees machines even report an IP conflict if you set a static address. It appears that the gratuitous ARP used to check if there is another machine using the address assigned by DHCP is being processed by the sending machine and it is then conflicting with itself.

Any ideas welcome I have been tearing my hear out for two days over this.

3 replies

by robo_dev

Are the laptops wireless or wired?

Local firewalls, other than what's in Vista?

What are the DHCP lease times versus the standby times of the laptops?

Are any laptops set to hibernate?

Are they all in the same broadcast domain?

Is the DHCP server on the same LAN?

how busy is the network?

Have you poked around with a protocol analyzer (e.g. WireShark)?

by willpd13

Hi let me see if I can answer your questions.

1. They have both connections and have the same problem with either or both at the same time if you try to connect both.

2. The only firewall between them and the DHCP servers is the Symantec Endpoint Protection v11 firewall.

3. The DHCP Leases are 8 days.

4. No they are not.

5. Yes they are in the same LAN which is all Cisco switched and traffic is monitored by our network team.

6. Yes

7. Usual amount of broadcasts but not especially heavy usage.

8. Yes wireshark shows that the machines are doing the normal DHCP Request/Offer/Request/Offer but this is followed by a decline packet.

Hope this clarifies things OK.

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