Very Computer

by **Robert Yode** » Sat, 16 Jan 1999 04:00:00

> Does anyone know how to change the subnet mask for solaris on a sun machine?

Sure! Lots of us do!

man netmasks

ry
--

"Unix: The Solution to the W2K Problem."

by **aaron** » Sun, 17 Jan 1999 04:00:00

Does anyone know how to change the subnet mask for solaris on a sun machine?

by **Barry Margoli** » Sun, 17 Jan 1999 04:00:00

>Does anyone know how to change the subnet mask for solaris on a sun machine?

ifconfig le0 1.2.3.4 netmask ffffff00

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by **LeeN** » Sun, 17 Jan 1999 04:00:00

Quote:>Does anyone know how to change the subnet mask for solaris on a sun machine?

vi /etc/netmasks

also, ifconfig <interface> netmask <newnetmask>

by **Scott Giffor** » Sun, 17 Jan 1999 04:00:00

>> Does anyone know how to change the subnet mask for solaris on a
>> sun machine?
LeeNMI> vi /etc/netmasks

LeeNMI> also, ifconfig <interface> netmask <newnetmask>

I've found that just using ifconfig, and putting it in my startup
files if need be, is *much* easier than dealing with /etc/netmasks.
I've been working with the Internet and with Solaris for several years
now, and I still can't quite figure out what's supposed to be in
/etc/netmasks...

------Scott.

by **Barry Margoli** » Sun, 17 Jan 1999 04:00:00

Quote:>I've found that just using ifconfig, and putting it in my startup
>files if need be, is *much* easier than dealing with /etc/netmasks.
>I've been working with the Internet and with Solaris for several years
>now, and I still can't quite figure out what's supposed to be in
>/etc/netmasks...

Prior to Solaris 2.6, which supports VLSM and CIDR, /etc/netmasks is pretty
simple. The first column is the *classful* network, and the second column
is the subnet mask for that network. E.g. if you're using the 172.16 class
B network, with the third octet as the subnet, you put:

172.16.0.0 255.255.255.0

It's only used by ifconfig when "netmask +" is used to get the default mask
for an interface; it's not used for remote networks.

In 2.6 the first column can contain actual subnet addresses; it will look
for the most specific one that matches your address, and use the
corresponding netmask. I don't have 2.6 handy, so I haven't actually
played with it and learned all the ways it's used.

--

GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Don't bother cc'ing followups to me.

by **Lance Woodso** » Sun, 17 Jan 1999 04:00:00

Quote:> Does anyone know how to change the subnet mask for solaris on a sun machine?

Change '/etc/netmasks' and reboot. You can also use '/sbin/ifconfig'.

Lance Woodson

by **John Kotche** » Mon, 18 Jan 1999 04:00:00

> > Does anyone know how to change the subnet mask for solaris on a sun machine?

> Change '/etc/netmasks' and reboot. You can also use '/sbin/ifconfig'.

> Lance Woodson

Lance, don't take this the wrong way, but.....

A reboot is _not_ necessary. This is Unix, you only reboot as a last
ditch effort. The fix is in 2 parts. I call them "Fix it now" and
"Fix it forever". You use both to avoid the reboot.

Fix it now:
ifconfig <interface> netmask <value> broadcast +

Fix it forever:
Option A:
Tweak /etc/netmasks file as appropriate

Option B:
Add a file /etc/rc2.s/S73localnet and add the
command from the "Fix it now" step.

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************************************************************
* A goofy Unix SA working for a large computer equipment *
* manufacturer and services provider. Opinions expressed *

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