[Discuss] CUPS Remote Printer

[Murray Strome]

My main printer is an Okidata OL600e B&W LED printer which is physically 
connected to my wife's printer.  Through new installs, upgrades, etc. I 
have never really had to do much to have it accessible to all my 
computers.  However, since re-installing Kubuntu on my wife's computer, 
I cannot no longer access it.  I imagine that it has something to do 
with my ability to access her computer. I have not changed any settings 
in my routers. The simplified configuration is:


    --------                   ---------------          -----------------
   | router|------------------|  Computer 1  |----------|Okidata Printer|
   |       |----               ---------------          -----------------
   --------     |
                |       
           --------------      ---------------
           |  router #2 |------|  Computer 2 |
           --------------      ---------------
                             

Of course, there are other computers connected to router & router 2, and 
other printers on both Computer 1 and Computer 2. The first router is 
connected to a cable modem box, then to Shaw cable.

All the computers used DHCP to get their addresses, as do the routers.  
I have changed Computer 1 to fixed address (one the router originally 
assigned to it), but that did not make any difference.

 From Computer 2, I can ping router or Computer 1 (or anything else 
connected on that router) from Computer 2. I can ping router 2 from 
Computer 1 using the address "leased" to it by router, but I cannot ping 
to Computer 2 from Computer 1.  I can connect to the internet from 
everywhere without any problem.  If I try to add a network CUPS printer 
in Computer 2, it cannot access Port 631 on the address assigned to 
Computer 1 by router.

As mentioned, I really did not have to do anything after previous 
reinstallations to have access to all the printers on all the computers 
from every computer.  I don't know what has changed. I seem to remember 
some security advice a while ago which recommended that UPNP should be 
disabled, which I did on both routers, but CUPS was still working OK 
long after I did that.

Any suggestions?

Thanks.

Murray