Red Hat Bugzilla – Bug 177516
CUPS can't find remote printers after kernel-2.6.14-1.1656_FC4 update
Last modified: 2007-11-30 17:11:20 EST
Description of problem:
CUPS can't find remote printers after kernel-2.6.14-1.1656_FC4 update.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Connect to network with CUPS printers shared from another machine.
2. Open system-config-printer or GNOME printer selection tool.
3. Observe list of printers
Remote shared printers are not displayed.
Remote shared printers should be displayed.
Problem also occurs with kernel-2.6.14-1.1656_FC4.netdev.7, does not occur with
kernel-2.6.14-1.1653_FC4, does not occur with kernel-2.6.15-1.1823_FC4
(currently in updates-testing).
At this point, I can no longer reproduce this problem. Not sure what the issue was.
This problem is back in kernel-2.6.15-1.1830_FC4.netdev.10, but not in
Well sure, it's true that it is CURRENTRELEASE, but I was trying to point out
that the netdev series still has the bug.
There is not a kernel-2.6.15-1.1831_FC4.netdev or later yet, so it's hard to
know if the fix would carry over. I haven't seen the problem in the mainstream
kernels since 2.6.15 appeared, but it appears in the 2.6.15 netdev kernels, so
it seems reasonable to conclude it has to do with one of the netdev patches.
It seems unlikely that CUPS is specifically targeted for failure. What other
networking problems are you experiencing?
What networking hardware are you using?
Please attach the output of running "sysreport" as well...thanks!
Created attachment 125513 [details]
sysreport (as reported by the .netdev kernel)
(In reply to comment #4)
> It seems unlikely that CUPS is specifically targeted for failure. What other
> networking problems are you experiencing?
It does seem wierd, but that's the only problem I've detected. If there are
others, they don't appear to interfere with normal operation.
> What networking hardware are you using?
This is a ThinkPad T41 with wireless ipw2200 and wired e1000. The .netdev
kernel fails to detect the printers on either interface. It appears as though
the production kernel can see the printers on either interface, but that's a bit
harder to test reliably.
> Please attach the output of running "sysreport" as well...thanks!
Update: The problem still occurs with kernel-2.6.15-1.1833_FC4.netdev.12, but
not with the stock kernel-2.6.15-1.1833_FC4.
Someone else reported a problem w/ ARP on those kernels. I thought it sounded
like it could be the same as this issue...
I found this patch:
It was the only one that seemed to touch the neighbor code and was in the
right timeframe. I have added it to my "closer to stock" test kernels. Would
you mind trying those kernels and see if you have similar problems to the
Please post the results here...thanks!
My ARP problem (multiple IP subnets in the same physical media, where the
routing of IP subnets is asymmetrical) is indeed fixed (compared to netdev
kernels) in 2.6.15-1.1833_FC4.jwltest.33.
CUPS remote printer detection works correctly with
Hmmm...well, then that wasn't it... :-( I'll keep looking...
Update: the ARP problem I was having with netdev kernels doesn't seem to be
present in 2.6.16-1.2069_FC4.netdev.13.
Remote printers are found in 2.6.16-1.2080.2.6_FC5.netdev.1 too. What's changed?
Difficult to say...mostl likely it has to do w/ FC4/5 moving to a 2.6.16-based
kernel. I'll leave this open a bit longer "just in case"...
I recently noticed that I no longer get remote printers although I used to (a
couple weeks ago). I don't know exactly which upgrade caused the problems, but
I currently experience them on FC5 running kernel 2.6.16-1.2107_FC5.
Re: comment 15, I understand that there is a Xen-related patch causing such
problems in FC5.