bin/38638: named(9) spams syslog

[bouyer%antioche.eu.org@localhost]

>Number:         38638
>Category:       bin
>Synopsis:       named(9) spams syslog
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 12 14:05:00 +0000 2008
>Originator:     Manuel Bouyer
>Release:        NetBSD 4.99.62
>Organization:
>Environment:
System: NetBSD chassiron.antioche.eu.org 4.99.62 NetBSD 4.99.62 (CHASSIRON) #1: 
Sun May 4 21:57:20 CEST 2008 
bouyer@rock:/dsk/l1/misc/bouyer/tmp/sparc/obj/dsk/l1/misc/bouyer/current/src/sys/arch/sparc/compile/CHASSIRON
 sparc
Architecture: sparc
Machine: sparc
>Description:
        When the interface with the default route is down (e.g. because pppoe
        didn't reconnect properly), named spams syslog with messages like
May 12 15:35:00 chassiron.localhost named[184]: 
/dsk/l1/misc/bouyer/current/src/dist/bind/lib/isc/unix/socket.c:1175: 
unexpected error:
May 12 15:35:00 chassiron.localhost named[184]: internal_send: 128.63.2.53#53: 
Network is down
[...]
May 12 15:35:03 chassiron.localhost named[184]: 
/dsk/l1/misc/bouyer/current/src/dist/bind/lib/isc/unix/socket.c:1175: 
unexpected error:
May 12 15:35:03 chassiron.localhost named[184]: internal_send: 
2001:478:65::53#53: Network is down

there are more than 10 of these messages per seconds (on a sparc IPX, on an
up to date system I immagine it'd be much more than that), quickly filling
up /var/log/message, causing loss of important informations (e.g. the
cause of the "Network is down"). 


>How-To-Repeat:
        setup named, "ifconfig down" the interface connecting to the
        default gw.
>Fix: