SUMMARY: Broadcast address on Solaris mysteriously changes.

From: LOEWENTHAL Simon <>
Date: Tue Apr 20 2004 - 11:39:34 EDT
Hi all,
 Thanks to everyone who replied to me.

Original post is included at the end of this mail.

* Decided that it was a 3rd party app calling ifconfig.  Added an ifconfig
wrapper to log ifconfig usage.

* Removed extra entry from /etc/netmasks.

* Rebooted machine.

After reboot watched the logs and saw something change the NIC.  I am in the
process of hunting down the s/w thaat did it.


Simon Loewenthal
Gemini Observatory
Information Systems Group


-----Original Message-----
Sent: Friday, April 16, 2004 11:24 AM
To: Sun Mangers
Subject: Broadcast address on Solaris mysteriously changes.

Hi all,

We have a Sun system whose broadcast address changes occasionally from a
Class C broadcast address to a Class B broadcast address.  I.E from to  I have entered this (See below) into the
/etc/netmasks to try and keep the broadcast address on track, but because
the address mysteriously changes during normal day-to-day operation and the
/etc/netmasks is only (I think?) consulted at during boot time, the
broadcast address still changes.

$ cat netmasks

$ ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
        inet netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet netmask ffffff00 broadcast
        ether 8:0:20:b2:f4:27
hme1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet netmask ffffff00 broadcast
        ether 8:0:20:b2:f4:27

$ showrev
Hostname: trecsk-ctl
Hostid: 80b2f427
Release: 5.8
Kernel architecture: sun4u
Application architecture: sparc
Hardware provider: Sun_Microsystems
Kernel version: SunOS 5.8 Generic 108528-03 August 2000

$ uname -a
SunOS trecsk-ctl 5.8 Generic_108528-03 sun4u sparc

Has anyone seen this before, or can anyone think of a process that would
change this?

Many thanks and regards for any time spent on this,

Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (
Version: 6.0.661 / Virus Database: 424 - Release Date: 19/04/2004
sunmanagers mailing list
Received on Tue Apr 20 11:39:26 2004

This archive was generated by hypermail 2.1.8 : Thu Mar 03 2016 - 06:43:33 EST