VMS TCPIP 5.3 on VMS 7.3-1

[Larry Cox]

Will VMS/TCPIP relearn a route to a network device if the route changes? Or, perhaps a better question is, should VMS care as long as the default gateway is available. In this particular situation, the gateway didn't change but a subnet was added on the other side of the gateway. When that happened, connectivity to network printers was lost until I bounced TCPIP services on VMS.

A VMS newbie....
Larry Cox

[Ian Miller.]

is dynamic routing enabled ?

[Larry Cox]

No it isn't.

[Ian Miller.]

Do you have the results of a traceroute to a printer at the time? I thought that the VMS system would send everything that does not have an explict route to the default gateway. I wonder if there was another problem (not routing) that was fixed by the restart of tcpip.

[Larry Cox]

No I don't and you are correct it could be another but related problem.

I am accustomed to other OS's depending on a default gateway to route WAN traffic. I have heard that VMS handles WAN traffic differently and depends on "learned routes" in cache. Is that true and can you explain?

[Ian Miller.]

If dynamic routing is not enabled then VMS uses the static defined routines. However I have seen TCPIP for VMS pick up routes when mtu_path was set to 1

The core routing functionality should act the same as HPUX (as that is where the tcpip stack came from).

[Larry Cox]

OK, Thanks!