<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> <blockquote type="cite"> <pre wrap=""><div class="moz-txt-sig">Hi, On Fri, 01 Dec 2006, Joseph Ollis wrote: </div></pre> <blockquote type="cite"> <pre wrap="">> 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. </pre> </blockquote> <pre wrap=""> 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. </pre> <blockquote type="cite"> <pre wrap="">> Does anyone have any thoughts? </pre> </blockquote> <pre wrap=""> 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</pre> </blockquote> Thanks Gavin, using the tcpdump I figured out that I did not have Port Forwarding enabled. I must have run into this problem 5-10 times,and I always forget. Anyway, thank you for the help. A good article on how to enable IP Forwarding is <a class="moz-txt-link-freetext" href="http://www.ducea.com/2006/08/01/how-to-enable-ip-forwarding-in-linux/">http://www.ducea.com/2006/08/01/how-to-enable-ip-forwarding-in-linux/</a> . JO </body> </html>