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Change IP and DECnet address on Openvms

 
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geir_2
Super Advisor

Change IP and DECnet address on Openvms

Hi,

Is it difficult to change the IP and DECnet addresses on OpenVMS?

Geir
10 REPLIES
Karl Rohwedder
Honored Contributor
Solution

Re: Change IP and DECnet address on Openvms

Geir,

what is difficult :-) ?

DECnet Phase V: @SYS$MANAGER:NET$CONFIGURE
DECnet Phase IV: @SYS$MANAGER:NETCONFIG
TCPIP: @SYS$MANAGER:UCX$CONFIG or TCPIP$CONFIG

Beware to set SCSSYSTEMID correct.

Search in the OpenVMS forum, there are threads already covering this topic.

regards Kalle
geir_2
Super Advisor

Re: Change IP and DECnet address on Openvms

Hi,

Thanks :-)
Volker Halle
Honored Contributor

Re: Change IP and DECnet address on Openvms

Geir,

note that if you want to retain the IP node name and only change the IP address, you would need to delete the IP node name from the local TCPIP host database first:

$ UCX SET NOHOST ip-node-name

Volker.
Daniel Fernandez Illan
Trusted Contributor

Re: Change IP and DECnet address on Openvms

Geir.
For me there are steps to modify IP and DECnet adresses:
1 - Modify SCS parameters (SCSNODE & SCSSYSTEMID)
on PARAMS.DAT (using SYSGEN) and MODPARAMS.DAT
2- Modify DECnet local name using NET$CONFIGURE (option 2)
3- Check new local name using DECNET_REGISTER
4- Modify routing values editing NET$ROUTING_STARTUP.NCL.
5- Modify ip values using TCPIP$CONFIG.
6- Reboot node

Saludos.
Daniel.
Robert Gezelter
Honored Contributor

Re: Change IP and DECnet address on Openvms

geir,

Daniel is correct to remind you to reset SCSSYSTEMID (see the HELP text in SYSGEN for the formula to convert the DECnet node number to SCSSYSTEMID).

He is also correct to remind you to check the name resolution mechanisms to ensure that the machine is properly identifiable.

On the IP side, I tend to favor running the machine with both IP addresses for a day or so. Many sites run their DNS servers with non-trivial timeouts (e.g., hours or days). Often, the DNS servers are also administered by a different group, and arranging for entries to be purged/modified can be a problem).

For that reason, I recommend multihoming the IP connections, and doing the changeover in the following sequence:

- Add the new IP address as a second address.
- Verify that the machine is reachable using the new address
- Notify the network group that the machine has a changed address.
- Wait an extended time (e.g., days or weeks; depending on a MULTIPLE of the DNS lifespans -- you can get this information without the cooperation of the network group by using NSLOOKUP on the zone record for the zone).
- Remove the old address once all of the DNS servers are no longer holding out of date cache entries

The above minimizes the potential for user disruption.

I hope that the above is helpful.

- Bob Gezelter, http://www.rlgsc.com
geir_2
Super Advisor

Re: Change IP and DECnet address on Openvms

Hello,

Is it necessary to delete the IP node name from the local TCPIP host database first, since I want to use the same nodename??

1) IP
UCX SET NOHOST ip-node-name

2) DECnet IV
$ mc Sysgen
sysgen>

At end run config scripst/command.


Thnaks



Volker Halle
Honored Contributor

Re: Change IP and DECnet address on Openvms

Geir,

if you use the same IP nodename again when defining the first interface, you provide an existing name and want a new IP address, but the same name already exists with the old address and therefore the name - address pair cannot be entered in the local TCPIP host database.

Volker.

Colin Butcher
Esteemed Contributor

Re: Change IP and DECnet address on Openvms

See "Ask the Wizard" and the VMS FAQ.

This is useful background in the FAQ:
"MGMT9. How do I change the node name of an OpenVMS System?"
Entia non sunt multiplicanda praeter necessitatem (Occam's razor).
Klaes-Göran Carlsson
Frequent Advisor

Re: Change IP and DECnet address on Openvms

And if you have some applications installed which are dependent on the nodename... like Object Broker, DECEDI.... then you of cource have to change there as well... but thats obvious, isn't it?
/Klaes-Göran
Jan van den Ende
Honored Contributor

Re: Change IP and DECnet address on Openvms

Geir,

to supplement Klaes-Gooran:

You also need to check (and probably adjust) your LICENSE database!

Do a
$ LICE LIST */FULL.
and check for any licenses with an INCLUDE clause. Those are the ones restricted to that specified nodename only!

When you are about ready to shutdown and boot with the new name, do a
$ LICENSE MODIFY [if not unique, add: /AUTH=] /INCLUDE=

Most relevant in this respect are the various VMS & VMS-usage licenses; the others can always be done later.

IF you forgot this, or somehow did it not exactly correct, then login is restricted to OPA0: only. (giving you an opportunity to correct things).

hth

Proost.

Have one on me.

jpe
Don't rust yours pelled jacker to fine doll missed aches.