[18297] in Hotline Meeting
DU network
daemon@ATHENA.MIT.EDU (John Chase)
Fri Sep 17 08:44:30 1993
To: hotline@MIT.EDU
Date: Fri, 17 Sep 93 08:44:16 EDT
From: John Chase <jchase@MIT.EDU>
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From: hoffmann@MIT.EDU
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To: littlitt@MIT.EDU
Cc: network@MIT.EDU, ylsul@MIT.EDU, bwmelans@MIT.EDU, jchase@MIT.EDU
Subject: network at DU
John, I got your voicemail message. I think that at this point, the
state of the original DDS leased line is academic. The new frame
relay connection is in place and fully functional so this seems like
the ideal opportunity to cut over to the new router and just
decommission the old.
In order to do this, we need to change the addresses on all the
machines in the cluster. The new addresses have been assigned; the
only change is the second byte of the IP address. This has changed
from 139 to 207.
There are two places on each machine where this information needs to
be updated:
/etc/athena/net.conf
/etc/athena/rc.conf
For example, for the server (du-server.mit.edu) net.conf would look
like:
NET 18.139.0.0
MASK 255.255.0.0
BROADCAST 18.139.0.0
HIGHEST 18.139.3.254
LOWEST 18.139.3.223
GATEWAY 18.139.0.1
ADDRESS 18.139.0.2
and should be change to look like:
NET 18.207.0.0
MASK 255.255.0.0
BROADCAST 18.207.255.255
HIGHEST 18.207.3.254
LOWEST 18.207.3.223
GATEWAY 18.207.0.1
ADDRESS 18.207.0.2
The ADDRESS parameter is the machine-specific address so you should be
certain that this is distinct for each machine. If you just
substitute the second byte only, you should be ok. The only other
subtlety is that the BROADCAST address needs to go from zeroes to ones
in the last two bytes.
The original rc.conf file on du-server will have a line which looks
like this:
ADDR=18.139.0.2; export ADDR # Internet address
You should change it to look like this:
ADDR=18.207.0.2; export ADDR # Internet address
Follow this procedure for each of the workstations/servers.
When you're done and *before* actually rebooting them so the new info
takes effect, you should move the ethernet transceiver which is
currently attached to the light grey cisco box over to the dark grey
one, THEN reboot the workstations. I would suggest doing one at a
time, the server being first.
The systems should come up on their new addresses.
If you feel uncomfortable about undertaking this task, we can set up a
time to do it when you're available.
Please let me know whichever way you go.
Lastly, I apologize if my note is on the over-detailed side but I
preferred to err on that side to make sure you had all the info you
might need should you want to do the address changes yourself.
- -Ron Hoffmann
DCNS Network Operations
ps. When things are up on the new connection, we'll
simply remove the old network equipment and tell
NET to cancel the old line. -rmh
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