[ntp:questions] Manycast Server Not Answering Manycast Client Requests

Potter, Timothy CCS Timothy.Potter at KiddeUS.com
Thu Aug 23 16:59:05 UTC 2018


I am testing out the manycast feature of NTP.  I have a situation where one of my machines, acting as the main manycast server, does not reply to incoming manycast client requests.  Using tcpdump I see the client requests coming into this machine, but they go unanswered.  However, once I restart the ntpd daemon on the manycast server, it will almost immediately begin replying to these requests.

I am using ntp version 4.2.8p8.  The ntp.conf file on my manycast server looks like this:

driftfile /usr/local/etc/ntp.drift
disable auth

# NTP clients will also act like a server once they sync
manycastserver ff0e::101

# Update the realtime clock and override its default
# stratum of 0.
server time.google.com prefer
server 127.127.1.0 #Real Time Clock
server 127.127.1.0 #Real Time Clock
fudge 127.127.1.0 stratum 10

I see that the ntp service is syncing with time.google.com:

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
LOCAL(0)        .LOCL.          10 l    -   64    0    0.000    0.000   0.000
*time2.google.co .GOOG.           1 u  140 1024  377   71.678   -2.836   2.511


The ntp.conf file on the ntp manycast client machines look like this:

driftfile /usr/local/etc/ntp.drift
disable auth

# NTP clients will also act like a server once they sync
manycastserver ff0e::101
manycastclient ff0e::101 iburst

# Enable syncing with servers on the same stratum.  Used for client machines
tos cohort 0

But they are not getting synced with the manycast server:

root at Node00b01973d7d4:~# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
ff0e::101       .ACST.          16 a    -   64    0    0.000    0.000   0.002


Any thoughts on what I am doing wrong?



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