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Microsoft DHCP rebind process

Posted on 2004-09-27
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Last Modified: 2010-03-18
Hi,
So in the MS 2000 DHCP mechanism, I was under the impression that the client performed some sort of ping to it's own address once it received an IP to ensure that it received a valid IP address from the server, but what I appear to be seeing in my ethereal traces is that the DHCP server is pinging the IP address between the DHCP Discover and the DHCP offer, and not the client doing this post-DHCP ACK; and I'm wondering if this is normal for MS DHCP, or if maybe it's because the client is rebinding to a new server and if this behavior is due to that. Or if I'm completely misreading the traces, please let me know.
Thanks in advance,
-Pj
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Question by:peterj33
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JFrederick29 earned 500 total points
ID: 12165084
It sounds like the DHCP server is setup for "conflict detection".  The DHCP server will ping the IP address it is about to offer to verify that no other device is currently assigned that same IP address.  If the DHCP server receives a reply to the "conflict detection" ping, it will not issue that IP address and move on to the next free address.  If the DHCP server does not receive a reply, it will offer that address to the client.  Conflict Detection is configurable in the DHCP server properties.  You can specify how many ping requests are sent out.
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