Danny Mayer writes:
> Dave Johnson wrote:
> > Danny Mayer writes:
> >> If you are not using autokey authentication then it doesn't do the
> >> autokey dance and as a result is unable to estimate the delay between
> >> the broadcast client and the broadcast server. You didn't include the
> >> client or server config file so it's hard to be sure.
> >>
> >> Danny
> >
> > Even though, it should be doing a burst on startup to calculate some
> > sort of delay right? I usually see 0.004 sec on all clients.
> > Shouldn't some sanity checking of the calcualted delay catch this?
> >
> >
> > No auth is on. This is an isolated, unconnected subnet. Once host is
> > setup for broadcasting as a local reference, all other hosts are
> > clients of that one host.
> >
>
> Authentication is OFF. disable auth disables authentication. Therefore
> your client is totally passive and never sends a packet to the server
> and therefore it cannot estimate the delay.
>
> Danny
It sends a burst when it first learns of a new broadcaster. See
capture below. It may not do this again as long as the broadcaster is
still sending, but it does it once at startup.
Somehow the system calcuated a negative broadcast delay. That
shouldn't make any sense. The broadcast delay should always be
positive right?
If this occurs what is the expected behaviour? Throw away the peer and
try again once another broadcst is received? Should it be marked
reject? It seems the processing code is putting alot of trust in the
broadcast delay. Should this be taken into account when selecting the
peer?
$ killall ntpd
$ ntpq -c lpeers
No association ID's returned
13:24:32.365788 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010375 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645423.633241474 (DF) (ttl 64, id 0, len
76)
$ ntpq -c lpeers
remote refid st t when poll reach delay offset jitter
==============================================================================
card8 .INIT. 16 u - 64 0 0.000 0.000 0.001
13:24:47.366006 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010360 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645408.633279383 (DF) (ttl 64, id 0, len
76)
13:25:03.367060 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010345 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645392.632467150 (DF) (ttl 64, id 0, len
76)
$ ntpq -c lpeers
remote refid st t when poll reach delay offset jitter
==============================================================================
card8 .EXTL. 1 u 2 64 1 0.077 0.371 0.001
13:25:19.787318 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
0 poll 6 prec -20 dist 0.000000 disp 0.000793 ref (unspec)@0.000000000 orig
0.000000000 rec -0.000000000 xmt -892645376.212694391 (DF) (ttl 64, id 0, len
76)
13:25:19.787423 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010360 ref [EMAIL PROTECTED] orig
3402321919.787305593 rec +0.000409111 xmt +0.000449330 (DF) (ttl 64, id 0, len
76)
13:25:20.366904 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010375 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645375.632789134 (DF) (ttl 64, id 0, len
76)
13:25:21.787061 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
0 poll 6 prec -20 dist 0.000000 disp 0.000823 ref (unspec)@0.000000000 orig
3402321919.787754952 rec -0.000332315 xmt +1.999295771 (DF) (ttl 64, id 0, len
76)
13:25:21.787240 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010391 ref [EMAIL PROTECTED] orig
3402321921.787050724 rec +0.000427884 xmt +0.000471846 (DF) (ttl 64, id 0, len
76)
13:25:23.786813 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
0 poll 6 prec -20 dist 0.000000 disp 0.000854 ref (unspec)@0.000000000 orig
3402321921.787522554 rec -0.000282834 xmt +1.999278306 (DF) (ttl 64, id 0, len
76)
13:25:23.786956 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010421 ref [EMAIL PROTECTED] orig
3402321923.786800861 rec +0.000390036 xmt +0.000426804 (DF) (ttl 64, id 0, len
76)
13:25:25.787562 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
0 poll 6 prec -20 dist 0.000000 disp 0.000869 ref (unspec)@0.000000000 orig
3402321923.787227690 rec -0.000271731 xmt +2.000322920 (DF) (ttl 64, id 0, len
76)
13:25:25.787701 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010208 ref [EMAIL PROTECTED] orig
3402321925.787550568 rec +0.000396255 xmt +0.000433951 (DF) (ttl 64, id 0, len
76)
$ ntpq -c lpeers
remote refid st t when poll reach delay offset jitter
==============================================================================
*card8 .EXTL. 1 u 2 64 1 0.077 0.371 0.041
13:25:27.788290 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
2 poll 6 prec -20 dist 0.000106 disp 0.948120 ref [EMAIL PROTECTED] orig
3402321925.787984549 rec -0.000283778 xmt +2.000297443 (DF) (ttl 64, id 0, len
76)
13:25:27.788453 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010238 ref [EMAIL PROTECTED] orig
3402321927.788281977 rec +0.000370007 xmt +0.000414823 (DF) (ttl 64, id 0, len
76)
13:25:29.788027 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
2 poll 6 prec -20 dist 0.000106 disp 0.948150 ref [EMAIL PROTECTED] orig
3402321927.788696825 rec -0.000244078 xmt +1.999322175 (DF) (ttl 64, id 0, len
76)
13:25:29.788153 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010269 ref [EMAIL PROTECTED] orig
3402321929.788019001 rec +0.000344565 xmt +0.000375777 (DF) (ttl 64, id 0, len
76)
13:25:31.786769 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
2 poll 6 prec -20 dist 0.000106 disp 0.948165 ref [EMAIL PROTECTED] orig
3402321929.788394749 rec -0.000241787 xmt +1.998362958 (DF) (ttl 64, id 0, len
76)
13:25:31.786906 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010299 ref [EMAIL PROTECTED] orig
3402321931.786757707 rec +0.000372182 xmt +0.000416864 (DF) (ttl 64, id 0, len
76)
13:25:33.786497 172.16.5.1.123 > 172.16.7.1.123: [udp sum ok] v4 client strat
2 poll 6 prec -20 dist 0.000106 disp 0.948196 ref [EMAIL PROTECTED] orig
3402321931.787174582 rec -0.000268849 xmt +1.999311208 (DF) (ttl 64, id 0, len
76)
13:25:33.786656 172.16.7.1.123 > 172.16.5.1.123: [udp sum ok] v4 server strat
1 poll 6 prec -20 dist 0.000000 disp 0.010330 ref [EMAIL PROTECTED] orig
3402321933.786485791 rec +0.000355906 xmt +0.000394069 (DF) (ttl 64, id 0, len
76)
13:25:36.365777 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010375 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645359.633967041 (DF) (ttl 64, id 0, len
76)
13:25:52.365645 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010375 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645343.634139358 (DF) (ttl 64, id 0, len
76)
13:26:08.366496 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010391 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645327.633341073 (DF) (ttl 64, id 0, len
76)
13:26:26.366027 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010406 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645309.633792281 (DF) (ttl 64, id 0, len
76)
13:26:44.366631 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010421 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645291.633217096 (DF) (ttl 64, id 0, len
76)
13:26:59.366564 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010406 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645276.633299350 (DF) (ttl 64, id 0, len
76)
13:27:15.365424 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010406 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645260.634476065 (DF) (ttl 64, id 0, len
76)
13:27:33.365983 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010421 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645242.633927106 (DF) (ttl 64, id 0, len
76)
13:27:48.366942 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010391 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645227.632979989 (DF) (ttl 64, id 0, len
76)
13:28:03.366907 172.16.7.1.123 > 172.16.63.255.123: [udp sum ok] v4 bcast
strat 1 poll 4 prec -20 dist 0.000000 disp 0.010375 ref [EMAIL PROTECTED] orig
0.000000000 rec -0.000000000 xmt -892645212.633028149 (DF) (ttl 64, id 0, len
76)
--
Dave Johnson
Starent Networks
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