[16101] in Athena Bugs
bcast ntp in 8.2
daemon@ATHENA.MIT.EDU (John Hawkinson)
Wed Aug 5 11:07:44 1998
Date: Wed, 5 Aug 1998 11:07:42 -0400
To: bugs@MIT.EDU
From: John Hawkinson <jhawk@MIT.EDU>
At the momennt. 18.187 and 18.70 are sharing a router port.
It so happens that the router thinks the primary is
18.187.
This means that, for the shared wire, broadcast packets look like:
10:58:24.421901 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
10:59:28.424419 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
11:00:32.427025 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
11:01:36.429464 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
11:02:40.431966 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
and of course, 18.70 machines don't "see" the broadcast packets, though
they are real broadcast packets:
11:03:44.434400 0:60:2f:9a:82:68 ff:ff:ff:ff:ff:ff 0800 90: 18.187.0.1.123 > 18.187.255.255.123: v3 bcast strat 2 poll 6 prec -24
I don't know if there's a way to fix this from xntpd's perspective.
One solution would be to have router send to a multicast group instead
of the broadcast address, but the last time I tried to configure a router
to do this I had problems limiting the ttl to a reasonable value.
Perhaps an answer is "eit".
--jhawk
