27 May
2014
27 May
'14
10:23 p.m.
On May 27, 2014, at 3:17 PM, Bob Armstrong <bob at jfcl.com> wrote:
in Phase IV the hello timer value is sent in the hello message
and that value times 3 (or 2) is used for the listen timer
That would explain why having LEGATO send hello messages more often
doesn't make any difference
If you send hellos more often, you time out sooner; either way, you time out if you lose 3
hellos in a row (or, probably just barely, if you lose two in a row). The assumption is
that no LAN is that badly broken.
The way to run DECnet over a flaky long distance network is to use point to point mode
with a data link layer that deals with packet loss. DDCMP is an example of such a data
link layer; X.25 is also (after a fashion). That s what the DECnet design intended.
paul