[ntp:questions] Re: Multicast TTL and FreeBSD trouble

wa6zvp at gmail.com wa6zvp at gmail.com
Thu Aug 18 14:28:06 UTC 2005

I'm not saying that there is an error in the code, per se, but
somewhere when the packet is assembled for putting on the wire, the TTL
is mis-handled.  On a RH linux machine, the byte is correct on the
wire, implying that it must be in the interface to the IP stack or some
such place.

For NTP use, most folks would want the multicast packets to stay within
the boundaries of their own local network, which means a TTL in the 1-3
range is probably appropriate.

As Danny pointed out, TTL for v4 used to really be time (was it
seconds?) but has been used as a router hop count for a long time.
This is how its defined for v6.


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