From: jason kappy (jasonkappy@yahoo.com)
Date: Tue Apr 11 2006 - 12:22:50 EDT
This forum rocks. I got numerous replies and everyone suggested we can do it on fly. Thanks to everyone. I tested this on a test server and worked. However I was not permitted to do this on Prod. There was also recommendation to bring up a virutal interface and change netmask of that interface.
Command:
ifconfig <interface> netmask xxx.xxx.xxx.xxx
ifconfig ce0 x.x.x.x netmask x.x.x.x broadcast x.x.x.x
Here are couple of replies
____________________________________________________________________
Hi Jason - if you really cannot down the interface try
"ifconfig netmask 255.255.255.0" (or whatever your netmask is)
then ping -s the broadcast for a bit "ping -s 10.144.1.255" (or
whatever
you have, then see how you go.
Other than that, plumb in a virtual interface "ifconfig ceo:1" then
configure with your settings and up this. When you have a scheduled
reboot/downtime you can then set the netmask of your "main" interface
properly.
-----------------------------------------------------------------------
I can only speak from experience, I have reset netmask on the fly but it was usually because the netmask was wrong and there were connectivity problems and it didnt drop any connections. So when I changed and corrected it, things got better, not worst. From reading the man page on ifconfig, it doesnt seem to reset the port like the up or plumb/unplumb options. Make sure you put the right subnet netmask in /etc/netmasks so when you reboot you dont have the same problem.
_______________________________________________________
Thanks,
J.
> Hi Gurus,
> Is there any way to change netmask without bringing
down the interface?
> This what I did lastnight in mid of crises and later realized about
netmask
> .
> ifconfig ce0 plumb
> ifconfig ce0 x.x.x.x up
>
> As of now system communicates within the local network but not
outside network. This is a Oracle databas box with Solaris 8.
>
> Thanks,
> J.
>
---------------------------------
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