Decnet problems

[Wim Van den Wyngaert]

I have node A and B in the same decnet area.

On A, I do set host B and get "remote node is not currently reachable".

I go to B with TCP and try set host A. It works.

I retry on A to do set host B. It works too.

Some time later on, it no longers works.

What's wrong ?

Wim

[Karl Rohwedder]

Do you have Phase V and DEcnet-over-IP?
Maybe the nameresolution is different. Try
running CDI$TRACE from a 2nd terminal and check what is going on.

regards Kalle

[Wim Van den Wyngaert]

Decnet+ on VMS 7.3. Also 6.21H3 can not communicate with the host.

Transport is NSP.

Wim

[Volker Halle]

Wim,

the fact that it works for a while after you've done B: SET HOST A can be explained by the end-node cache. An end node remembers (for some time) which node it has been communicating with.

To get naming out of the picture and DECnet-over-IP, just repeat your tests using the plain DECnet adresses.

Volker.

[Wim Van den Wyngaert]

Addresses don't work either.
No TCP involved.

Wim

[Volker Halle · Accepted solution]

Wim,

how many routing circuits on node A and node B ? End nodes or routing nodes ?

Is a router involved (NCL SHOW ROUT CIRC csmacd-a ADJ * ALL) ? If so, it's the router's job to find a path to the remote node. Once a path has been found, the end node (using the address data in the end-node cache) can communicate directly (assuming both nodes are on the same LAN).

Volker.

[Wim Van den Wyngaert]

Volker,

Sorry for the delay, internet not working properly.

On A : 1 router. On B : none. They are not configured manualy on VMS. Is something missing in network config ?

Wim@home

[Volker Halle]

Wim,

there's something wrong in the network config or router. But this explains, WHY you can do B: SET HOST A - an end-node without a router just tries to send the packet out on the LAN - and it works !

Then (for some time) A can also do SET HOST B, as node B's address is in it's endnode cache. Once this times out, A has to ask the router, which does NOT seem to know about node B.

Node B does not seem to see the Router Hello messages and the router does not seem to see node B's endnode hello messages. (DECnet) Multicast messages blocked ?

You could use TRACE START/LIVE "routing circuit csmacd-0" on node B to see if it receives any router hello messages.

Volker.

[Wim Van den Wyngaert]

Will come back on it on Monday.

Thx Volker.

Wim

[Wim Van den Wyngaert]

It seems that hello messages are seen for the wrong area. Time to call the network team.

Wim