DHCP not responding to DHCPDISCOVER

Hi guys,

We had a down stream switch die, causing a massive data storm on the network. Since then we have had intermittent issues with DHCP. Got a whole lot worse after moving the DHCP server (reset the switches though to pick up new MAC addresses, So not sure why)

Windows client error 0x79.

What can I look for on the switches themselves to see why the DHCPDISCOVER is not getting through?
liminalAsked:
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ded9Commented:
Did you check this article

http://www.dslreports.com/forum/r24264123-WIN7-How-to-solve-Error-Event-ID-1001-Source-DHCPClinet


Disable bluetooth networking device.


If the issue persist then use wireshark to isolate the issue.


http://www.wireshark.org/download.html



Ded9
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jburgaardCommented:
If you are using vlans check the
 ip helper-address
 setting
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jburgaardCommented:
If you use
dhcp snooping
it must be set up acording to new settings
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nociSoftware EngineerCommented:
Disk full issues at the server, or other problems on the server hosting the DHCP service?
Alle addresses in use at the DHCP server?
Those conditions may cause the DHCP process to wait for more favourable conditions, before responding to network requests.

This assumes that all requests do arrive at the DHCP server. directly or relayed.
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eeRootCommented:
What specifically was done, when the DHCP server was moved?
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liminalAuthor Commented:
http://www.dslreports.com/forum/r24264123-WIN7-How-to-solve-Error-Event-ID-1001-Source-DHCPClinet

That made me laugh, but nothing to do with my issue. I try wire shark.

When i enable DHCP admin logging on the client I get this error.

Offer Receive Timeout has happened on the interface 12

How can I see if DHCPDISCOVER requests are getting though or not?
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liminalAuthor Commented:
OK set up wireshark on the client. As I said first up, I can see the requests going out. but no offers coming back.
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liminalAuthor Commented:
After restarting the server its now offering, and I'm getting some requests back but most seem to be just stuck in some kind of loop

Not recognizing any of the offers
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nociSoftware EngineerCommented:
I did suggest earlier that you look at resources (or rather lack thereof) on the server.

Verry busy interface, very busy CPU, disk full for disk where data file is stored, or unable to log messages....
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liminalAuthor Commented:
Yeah I did look @ that. But its fine, it seems to be the workstations not responding to offers though?
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liminalAuthor Commented:
No I stand corrected, checking wire-shark this morning. I can see a lot of offers then requests but no acknowledgements.
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nociSoftware EngineerCommented:
What does the eventviewer tell you?
(Is the evenviewer limited in size, can it remove records from the back to create space for new?)
Is the store for the reservation writeable by the DHCP process?
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liminalAuthor Commented:
I think it was just honest to goodness network congestion. Moved the server back to the original server and I started seing ACKs to the requests.

So yeah, strange, not sure what happened there to be honest.
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