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Question
Tuesday, July 8, 2014 5:35 PM
We are having an issue with our Windows DHCP 2012 R2 cluster. I'm not sure if this is because it's a cluster or what, but I've never seen this problem before. We are going around and changing all of our printers in the enterprise from static IP's to DHCP MAC address reservations.
From the
As you can see from the screenshots the MAC addresses for a few of the printers seem to have a whole bunch of extra zero's at the end. These were NOT there when we added the MAC addresses reservation. They seem to be cropping up randomly a few days after we add the reservations. Has anyone ever run into this before?
All replies (4)
Wednesday, July 9, 2014 10:08 AM ✅Answered
http://technet.microsoft.com/en-us/library/cc977614.aspx
The unique id can be, but does not have to be the client MAC.
Some HP printers send an mismatched DHCP Client Identifier due to an issue in the printer's DHCP client software. Instead of sending the DHCP Client Identifier by concatenating the hardware type (normally '01') and the hardware address, they generate the DHCP Client Identifier by concatenating '00' and the hardware address. If the printer's DHCP client software can be reconfigured to stop sending any DHCP Client Identifier, you may choose to do that. Or reconfigure the printer so it doesn't rely on its DHCP client software; have it learn its IP information via BootP or manual configuration. Or get the vendor to fix the DHCP client firmware (through a firmware update).
MCP/MCSA/MCTS/MCITP
Thursday, July 10, 2014 7:38 AM ✅Answered
Hi,
The DHCP Options and BOOTP Vendor Extensions provide by DHCP clients, in general is the client MAC, but it does not to be, you can configure your printer use the MAC as the identifier.
More information:
Client Unique Identifier
http://technet.microsoft.com/en-us/library/cc977614.aspx
RFC2132
http://www.ietf.org/rfc/rfc2132.txt
Hope this helps.
Thursday, July 10, 2014 1:58 AM
Manual is not an option.
According to this article a change of the adapter on the printer from auto negotiate to 100TX-Full fixed the issue for a number of them. Would this have any affect?
Would BootP really be a long term solution to this problem? Does BootP not send back a UniqueID?
Tuesday, July 15, 2014 2:06 AM
Hi,
Just want to confirm the current situations.
Please feel free to let us know if you need further assistance.
Regards.