[ntp:questions] Re: NTP over multicast sat link with no return channel

juliansomers at googlemail.com juliansomers at googlemail.com
Mon Apr 10 23:07:32 UTC 2006


Thanks for the replies,

I think I now have the server sending the multicast correctly, using
this:
 broadcast 229.1.1.8 ttl 2

I see the packets coming over the satellite using tcpdump:
 22:50:05.750313 IP 192.168.1.2.123 > 229.1.1.8.123: NTPv4 bcast, strat
3, poll 6, prec -20

Im running ntpd on the client with this config:
driftfile       /var/lib/ntp/ntp.drift
restrict default nomodify nopeer
restrict 127.0.0.1
multicastclient 229.1.1.8
disable auth

It seems that ntpd is listening to the multicast:
root # netstat -na | grep 229.1.1.8
udp        0      0 229.1.1.8:123           0.0.0.0:*

but I don't see the peer come up on he client when I go:
root # ntpq -pn
No association ID's returned

Should I see it as a peer?

I did not expect to see 229.1.1.8 on the server as a peer:
water root # ntpq -pn
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
+213.205.157.156 129.69.1.153     2 u   25   64  377    7.595    0.466
 0.251
*130.159.196.118 131.188.3.222    2 u   34   64  377   19.902   -2.001
 0.247
-158.43.128.33   193.67.79.202    2 u   32   64  377    2.892    3.140
 0.632
-158.43.128.66   193.67.79.202    2 u   35   64  377    2.844    3.764
 0.489
-158.43.192.66   193.79.237.14    2 u   31   64  377    1.978    7.359
 0.288
+130.88.202.49   194.81.227.227   2 u   27   64  377   15.726   -3.481
 0.427
+130.88.200.98   128.86.8.123     2 u   21   64  377   16.155   -4.333
15.601
 229.1.1.8       .MCST.          16 u    -   64    0    0.000    0.000
4000.00

Does this look correct?

Danny, you said,
> You can disable auth in the client by adding disable auth to the config
> file. You would need to do it for your case.
does this mean that if I disable auth, the client will not try to
contact the server for authentication, and so there is not a need for
novolley?

many thanks for your time,

Julian




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