Broadcast address on Solaris mysteriously changes.

LOEWENTHAL Simon sloewenthal at
Fri Apr 16 11:23:52 EDT 2004

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,

Simon Loewenthal
Gemini Observatory
Information Systems Group
Voice +56 51 205610

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