[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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