topic Set host via decnet over IP in Operating System - OpenVMS

Set host via decnet over IP

Michael LaRoche — Wed, 05 Mar 2008 21:04:23 GMT

We have a system that we do a set host from one node a to node b that takes 35-60 seconds to connect. When we try the other way from b to a it's quick. We are running DecNet over IP with TCPIP vers. 5.4 eco 6. The systems are running OS 7.3-2. I've tried flushing the ncl cache on both systems but it still takes along time to get to the username prompt the one direction. Any help will be appreciated. TIA. Mike

Re: Set host via decnet over IP

Jan van den Ende — Wed, 05 Mar 2008 21:36:11 GMT

Michael,

This sounds mightily like a DNS or Routing problem.
Could it be that, seen from the node where SET HOST lasts long, the first try to connect fails; waits for timeout; and then tries a second path, which responds?
Where the other direction, the irst try succeeds?

hth

Proost.

Have one on me.

jpe

Re: Set host via decnet over IP

Hoff — Wed, 05 Mar 2008 21:59:11 GMT

These are usually either a back-translate error somewhere or some sort of a related a DNS or BIND delay, or a case where a less-than-optimal transport choice was selected via DECNET_REGISTER and you're seeing what amounts to a transport-level timeout, and a fallback.

Try a numeric-address connect, too.

Re: Set host via decnet over IP

Bill Hall — Wed, 05 Mar 2008 22:30:17 GMT

Mike,

As Hoff suggested from node a try a $set host ip$xxx.xxx.xxx.xxx to node b's tcpip address. If this connects as fast as node b to a, then the problem is in name to address translation. If this is still slow, try a telnet from node a to node b by address. Try a telnet from node a to node b by hostname.

If name resolution is slow, compare the appropriate NCL files on the two systems, probably NET$DNS_CLERK_STARTUP.NCL and NET$SEARCHPATH_STARTUP.NCL. Does node a use an "off LAN" DECdns server by chance? If so, have you configured node a to be able to find the off LAN server by running SYS$MANAGER:DNS$CONFIGURE.COM?

Bill

Re: Set host via decnet over IP

Michael LaRoche — Wed, 05 Mar 2008 23:37:11 GMT

The solution was that the decnet address in the registry was pointing incorrectly. Thanks for all the good advice.