[ntp:questions] multicast - wrong interface

Harlan Stenn stenn at ntp.isc.org
Mon Feb 19 02:21:08 UTC 2007

I suspect many would appreciate having information like this added to:




>>> In article <x7vehzduay.fsf at pip.kardel.name>, Frank Kardel <kardel at ntp.org> writes:

Frank> I looked into that issue today on NetBSD. As it turns out the IPv4
Frank> mcast implementation will copy the multicast pakets to any interface
Frank> where the respective multicast groups have been joined. For that to
Frank> happen on a multihomed host (one with several multicast capable
Frank> interfaces) you need to run mrouted or some other multicast routing
Frank> daemon.  It is relatively easy to modify ntpd to find out the
Frank> preferred/default multicast interface, but it should not be
Frank> neccessary when a multicast routing daemon installs the appropriate
Frank> Multicast Forwarding Cache entries in the kernel.

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