Broadcast address on Solaris mysteriously changes.

From: LOEWENTHAL Simon (sloewenthal@gemini.edu)
Date: Fri Apr 16 2004 - 11:23:52 EDT

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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
172.17.2.255 to 172.17.255.255. 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
172.17.0.0 255.255.255.0
172.17.2.0 255.255.255.0
172.17.0.0 255.255.255.0
172.17.3.0 255.255.255.0

$ ifconfig -a
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 172.17.2.64 netmask ffffff00 broadcast 172.17.255.255
        ether 8:0:20:b2:f4:27
hme1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
        inet 172.17.3.64 netmask ffffff00 broadcast 172.17.255.255
        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
Domain: cl.gemini.edu
Kernel version: SunOS 5.8 Generic 108528-03 August 2000

$ uname -a
SunOS trecsk-ctl 5.8 Generic_108528-03 sun4u sparc
SUNW,UltraSPARC-IIi-cEngine

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.

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