topic DECnet over IP routing question in Operating System - OpenVMS

DECnet over IP routing question

Galen Tackett — Wed, 28 Mar 2007 07:52:17 GMT

Suppose I had two DECnet Plus routing systems configured to use both the traditional DECnet IV transport and DECnet over IP. They would each have both a local LAN (is that redundant? :-) and a connection to the same IP-only router.

Can these two systems somehow route between their two LANs for systems that are running only DECnet IV?

Re: DECnet over IP routing question

Volker Halle — Wed, 28 Mar 2007 08:34:43 GMT

Galen,

I don't think so.

DECnet over IP works at the transport layer, not at the network layer. DECnet over IP connections are point-to-point between DECnet Plus systems, all routing of these connection is done in IP. An incoming Phase IV DECnet message cannot be 'forwarded' via DECnet over IP.

If you connect both DECnet Plus routing systems with one LAN interface to each of both local LANs, they should be able to route traffic from one LAN to the other.

If I haven't correctly understood your network topology, please consider to provide a network diagram (in an attachment).

Volker.

Re: DECnet over IP routing question

Galen Tackett — Wed, 28 Mar 2007 09:54:24 GMT

With a recent change in network security requirements, I'm hoping that we can persuade our client's Infosec people to let us use a switch between the two networks. This would be the best solution if they will let us.

Volker, the network topology I'm considering is a very simple one. I've tried to make a simple diagram, which is attached.

Re: DECnet over IP routing question

H_Bachner — Wed, 28 Mar 2007 20:28:13 GMT

Transparent routing won't work, but you should beable to use "poor man's routing", e.g.

$ dir locphv::remphv::remph4::

(locphv - the Phase V node on the local LAN, remphv - the Phase V node on the other side of the IP router, remph4 - the Phase IV system on the remote LAN)

Hope this helps,
Hans.

Re: DECnet over IP routing question

Colin Butcher — Thu, 29 Mar 2007 02:37:19 GMT

Why not just configure one (or two for redunancy if you wish) VMS systems as both DECnet and TCP/IP routers, then connect each to both LANs?

DECnet Phase IV routing will cope fine. TCP/IP OSPF routing should also cope fine.

Cheers, Colin (www.xdelta.co.uk).