Printer using port forwarding in Edubuntu

[Gavin McCullagh]

Hi,

On Fri, 01 Dec 2006, Joseph Ollis wrote:

> I have a workgroup printer in my ltsp edubuntu computer lab(setup with
> the default two network cards, one connected to the school lan, and one
> connected to the switch for ltsp). I would like to share that printer
> with other computers within my school lan. The school computers use the
> 10.0.0.* ip addresses and the edubuntu ltsp clients are using the
> 192.168.13.*.  I have used iptables before so I tried the following at
> our ltsp server.
> 
> /sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 9100 -j DNAT --to 192.168.13.234:9100
> /sbin/iptables -A FORWARD -p tcp -i eth0 -o eth1 --dport 9100 -j ACCEPT
> 
> When I tried the printer setup on our XP machines, the setup worked 
> well, but would not print the test page. I am not receiving iptables log 
> errors in kern.log or dmesg. 

In what sense did the setup work well if you couldn't print? ;-)

Are you definitely printing over jetdirect (ie port 9100)?  If you run
something like:
	tcpdump dst port 9100
it should show you all packets in and out on port 9100. Using:
	tcpdump dst host 192.168.13.234
you should be able to see the rewritten packets.

> Does anyone have any thoughts?

I guess the above should work but could you not just set up a CUPS print
queue on the Edubuntu server and point the 10.0.0.0/24 machines at the
edubuntu server?  I guess it adds a bit of a load to edubuntu, but not
much.  You can also have cups preprocess print jobs.

Gavin