P2055dn with linux networking

[Josh Danziger]

I'm having a strange networking problem with my P2055dn if I use my Linux (CentOS 5.3) DHCP server.

My hardware comprises
1) O2 router (DG585v7)
2) Cisco 3524-XL-POE switch
3) Server running CentOS 5.3 & trixbox 2.8
4) Clients running either XP SP3 or Vista
5) P2055dn printer upgraded to 20081124 firmware on static IP address
6) Cisco 7940 IP phones

I really need to run DHCP on the server rather than on the router. (This is because the DHCP function on the server is able to specify a TFTP server, and I need this in order to be able to configure the IP phones.) However, if I do this then I lose the ability to print on the P2055dn; more specifically any documents I print just sit in the print queue with an error flag. Despite this I have no problem seeing the printer on the network, for example I can access it on its static IP address with a web browser.

The problem goes away if I stop using the CentOS DHCP function, either by assigning static IP addresses to clients, or by switching over to the router's DHCP function and switching off the CentOS service. However assigning static IP addresses is inconvenient, and using the router's DHCP service doesn't allow me to configure my phones.

I should emphasise that apart from using the printer, the rest of my network is just fine on the CentOS DHCP server, and the IP addresses assigned all seem completely reasonable and are suitably unique.

Here's my CentOS dhcpd.conf file
-------------
ddns-update-style interim;
ignore client-updates;

subnet 192.168.1.0 netmask 255.255.255.0 {

option routers 192.168.1.254;
option subnet-mask 255.255.255.0;
option nis-domain "trixbox1.localdomain";
option domain-name "trixbox1.localdomain";
option domain-name-servers 192.168.1.254;
option time-offset 0; # GMT
option ntp-servers 192.168.1.100;
option tftp-server-name "192.168.1.100";

range dynamic-bootp 192.168.1.20 192.168.1.99;
default-lease-time 43200;
max-lease-time 86400;
}

--------------------
Any thoughts here gratefully received.

Josh