Kodak® | lpd://address/ps |
QMS® CrownNetTM | lpd://address/ps |
Tektronix® PhaserShareTM | socket://address:9100 |
XEROX® 4512 NIC | lpd://address/PORT1 |
XEROX® XNIC | lpd://address/PASSTHRU |
XEROX® (most others) | socket://address:5503 |
Troubleshooting SNMP Discovery Problems
Whenever you view the administration web page or a list of supported device URIs, the snmp backend will probe the local network(s) using Simple Network Management Protocol (SNMP) broadcasts. Printers that respond to these broadcasts are then interrogated for the make and model and supported protocols, yielding a device URI that can be used to add the printer.
That said, the SNMP requests sometimes expose problems in vendor SNMP or IPP implementations. If you are experiencing long delays in loading the CUPS web interface administration page, or if you don't see your printer listed, the following instructions will help you to diagnose those problems and/or provide important feedback to the CUPS developers so that we can correct problems and improve the SNMP backend in future releases.
Quick Fixes
If you don't use "public" as your community name, create a text file called /etc/cups/snmp.conf and put the following line in it:
Community your community name
If you have more than one community name, list them all on separate lines.
If you don't support SNMP v1 on your network, you are currently "out of luck". That said, we will be adding v2, v2c, and v3 support in future CUPS releases once we have a handle on the actual requirements people have for such things. Please file or update an SNMP enhancement request with specific requirements you have
-what you need supported, why you need it supported, and how you would like to see the functionality provided/exposed - so that we can do it "right" the first time.
Basic Debugging
The SNMP backend supports a debugging mode that is activated by running it from a shell prompt. If you are using Bash (/bin/bash), Bourne shell (/bin/sh), Korn shell (/bin/ksh), or Z shell (/bin/zsh), you can run the following command to get a verbose log of the SNMP backend:
CUPS_DEBUG_LEVEL=2 /usr/lib/cups/backend/snmp 2>&1 tee snmp.log
For C shell (/bin/csh) and TCsh (/bin/tcsh), use the following command instead:
(setenv CUPS_DEBUG_LEVEL 2; /usr/lib/cups/backend/snmp) & tee snmp.log
On MacOS X you'll find the SNMP backend in /usr/libexec/cups/backend instead:
CUPS_DEBUG_LEVEL=2 /usr/libexec/cups/backend/snmp 2>&1 tee snmp.log
The output will look something like this:
1 INFO: Using default SNMP Address @LOCAL