[Discuss] CUPS Remote Printer

[Murray Strome]

John Blomfield wrote:
> Murray Strome wrote:
>> 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.
>>
> You need to open the router #2 firewall so that computer 1 can see 
> computer 2.  It depends on the brand of router and its software how 
> you do this.  Have a look and the firewall rules for router #2, it 
> should have a menu item that allows you to do this.  As a last resort 
> you could put Computer 2 in the DMZ (Demilitarized Zone) as it would 
> still be protected by the other router.  Incidentally why do you need 
> router #2 would not a switch do just as well unless it has to be 
> secure from Computer 1 and the others on router?
>
> John Blomfield
I am not sure HOW to open router #2 firewall so that computer #1 can see 
computer 2. Router #2 is a Trendnet TEW-432BRP. I see a setting on the 
Trendnet to enable DMZ but it wants a DMZ host IP; what would that be, 
or is that what I should be doing?

The reason I am using router #2 is that two of my computers are in 
another room, quite far from the cable modem.  I had run one ethernet 
cable through the walls to that room, but it was enough of a chore to do 
so that I did not want to run another one (besides, all the ports on the 
first one were in use).  I tried to use a wireless card for the second 
computer, which worked (sort of) on one of the computers if I used 
Windows XP on it, but I could never get a very good signal, and I was 
never able to get it working with LINUX.  There was a very good price on 
the Trendnet (cheaper than another cable), and it did the trick without 
any effort until now.

Murray