> From [EMAIL PROTECTED] Wed Apr 21 16:15:55 2004
> Date: Wed, 21 Apr 2004 17:27:17 -0500
> From: Russell Adams <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: LPRng: Runaway and DNS lookups
>
> I've got a print queue with an lp entry for a printer who's DNS name
> was removed.
>
> Someone sent print to the queue, and of course LPRng can't resolve the
> name to contact the printer. This works properly.
>
> As an unintended consequence, LPRng has brought our DNS server to its
> knees with a tight loop of dns lookups that fail for the name that no
> longer exists. We're talking hundreds of lookups a second, being sent
> by a 2.4 ghz server to an old 400 mhz DNS box. It didn't stand a
> chance. =]
I am puzzled by this. On the current release I did:
t1:
:[EMAIL PROTECTED]
lpr -Pt1 /tmp/hi
and got:
Printer: [EMAIL PROTECTED] 'Test Printer 1' (dest [EMAIL PROTECTED])
Queue: 1 printable job
Server: pid 2454 active
Unspooler: pid 2455 active
Rank Owner/ID Pr/Class Job Files Size Time
active [EMAIL PROTECTED] A 452 /tmp/hi 3 13:44:30
Printer 'nohost.private' - cannot open connection - bad or missing hostname
If I change this to:
t1:
:lp=nohost.private%9100
>
> Obviously I'll correct my printcap, however I don't think the tight
> loop to the DNS server was intended to work quite like that.
>
> I've tried updating my connect_interval to 5 seconds, but it did not
> change the behavior.
>
> I'm running 3.8.26 on Redhat ES 2.1.
>
> Russell
>
In the next release I will add a bit more debugging for situations like this:
h110: {290} % lpq -l
Printer: [EMAIL PROTECTED] 'Test Printer 1'
Queue: 1 printable job
Server: pid 12124 active
Unspooler: pid 12125 active
Status: opening TCP/IP connection to nohost.private%9100 at 14:16:36.347
Status: cannot open 'nohost.private%9100' - 'getconnection: cannot get address for
'nohost.private'', attempt 2, sleeping 20 at 14:16:36.349
Rank Owner/ID Pr/Class Job Files Size Time
active [EMAIL PROTECTED] A 122 /tmp/hi 3 14:16:26
error [EMAIL PROTECTED] A 801 ERROR: too many errors
Patrick
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