[ntp:hackers] Manycast interfering with client packets?
Danny Mayer
mayer at gis.net
Thu Apr 20 21:37:58 UTC 2006
Dave,
I've been debugging a problem with a Windows bug and I had it set up as
a multicast client as well as a broadcast client:
multicastclient 239.1.1.2
broadcastclient
I found that it was dropping packets from a neighboring system sending
client packets.
It appears that the cause of my ntpd not returning anything is due to it
deciding that it is not a manycast server. It is falling into this piece
of code in the receive() function in ntp_proto.c
/*
* This must be manycast. Do not respond if not
* configured as a manycast server.
*/
if (!sys_manycastserver) {
sys_restricted++;
return; /* not enabled */
}
Apparently this is due to my have it act as a multicast client. This
seems wrong to me, but removing that allowed the packet to be processed
and a packet returned. We will need to revisit this but it seems like a
bug to me since I don't have it set up as manycast.
Danny
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