DHCPD missing router option in DHCPACK
Dawn Keenan
dkeenan at uwaterloo.ca
Thu Jul 17 15:20:02 UTC 2008
Tom Griffin wrote:
> Hello,
>
> We have observed behaviour which has changed between versions of dhcpd.
>
> We were previously running V3.0rc1pl1 with no failover configured. We
> have since tried both 3.1.1 and 4.0.0 with failover configured and found
> it to generate incorrect DHCPACK packets which are missing the router
> option for seemingly fine DHCPREQUESTs. This has so far only been
> observed with some models of HP printers (Laserjet 2600/1022/6310,
> Photosmart C5180, Officejet 7780).
>
> A packet capture shows that the printers skip the DISCOVER/OFFER stage
> and move straight to REQUEST, requesting a specific IP and various
> options (in this order);
> 6 - Domain Name Server
> 3 - Router
> 1 - Subnet Mask
> 15 - Domain Name
> 66 - TFTP Server Name
> 67 - Bootfile Name
> 13 - Boot File Size
> 12 - Host Name
>
> The dhcpd then responds with a DHCPACK containing the following options
> (in this order);
> 53 - DHCP Message Type
> 54 - Server Identifier
> 51 - IP Address Lease Time
> 6 - Domain Name Server
> 1 - Subnet Mask
> 1 - Subnet Mask
> 15 - Domain Name
We've seen the same problem with a handful of HP printers. I filed bug
18133 about the problem and downgraded to 3.0.7, since we noticed the
problem fairly quickly after we upgraded to 3.1.1.
--
Dawn Keenan
(former) Network Integration Specialist
Information Systems and Technology
University of Waterloo, Waterloo ON
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