[cups] [UNKN] STR #4320: Strange problem with CUPS on a Linux (CentOS 5.10) LAN

Robert Heller heller at deepsoft.com
Sat Dec 21 21:38:31 PST 2013

At Sat, 21 Dec 2013 19:13:35 -0500 Michael Sweet <msweet at apple.com> wrote:

> Robert,
> On Dec 21, 2013, at 5:59 PM, Robert Heller <heller at deepsoft.com> wrote:
> > ...
> > I'm off as well.  We are stuck at 1.3.7, since that is the version supplied by 
> > RHEL/CentOS 5.  If browsing is dropped, how does printer sharing via cups 
> > work?  Do you have to explicitly configure the shared printers?  Why was 
> > browsing dropped?
> Bonjour (DNS-SD) is used exclusively in 1.6 and later and was available as far back as 1.1.17 (assuming your OS vendor enabled it).
> Browsing was dropped because the simple heartbeat broadcasts used by CUPS
> browsing were really bad for network performance (particularly on wireless
> LANs), it only worked with IPv4, it didn't like network changes, and it
> needed either hardcoded IPs or working DNS. Bonjour doesn't have that
> problem and, for larger network installs, you can use regular DNS (vs.
> multicast DNS) fairly easily.

The machine has always had a hard-coded IPv4 address.  We only ever use 
regular DNS.

> > ...
> > What sort of network configuration error that only affects *one* machine.
> Address configuration issues come to mind - a bad interface address,
> broadcast address, or netmask will cause problems with broadcast-based
> protocols but often does not affect TCP-based protocols.

This is all via DHCP and all of that is correct.

> > The 
> > diskless clients get the network set up via DHCP in the init ramdisk and they 
> > all use the same init ramdisk, so either they are all wrong (in which case 
> > none should work) or are all right (in which case they should all work).  With 
> > only one have *intermittent* problems, it is strange.  As you suggested, a 
> > *physical* network problem would cause other (very obvious) problems, which 
> > don't *seem* to be happening.  The problem is very specific, which *suggests* 
> > a specific problem, but nother pops up.
> One possibility - was the machine (or the MAC address of the machine)
> previously associated on the network with a different address? Then the DHCP
> server might be handing it an old address instead of an address from the
> current space?

No, all of that is sane.  I did change the address from one address to 
another. The problem vanished, but came back.

> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
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Robert Heller             -- 978-544-6933 / heller at deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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