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Daniel_Ao_10370's avatar
Daniel_Ao_10370
Icon for Nimbostratus rankNimbostratus
Apr 20, 2009

NTP Server Health Monitor

I would like to load balance my internal NTP servers in BIGIP. How to monitor NTP service in F5?     In addition, I found that there is an udp monitor in BIGIP, how does udp monitor works?
management
monitoring
JRahm's avatar
JRahm
Icon for Admin rankAdmin
Apr 20, 2009
If BIG-IP is synced to your NTP servers, why not just use one of the self-IP's as the server and eliminate the extra call? My XP machine sync's just fine to my self IP:

 

 

 

[root@ltm-dc01:Active] config ntpdc -p

 

remote local st poll reach delay offset disp

 

=======================================================================

 

=ntp-1.gw.uiuc.e 10.10.10.10 2 256 377 0.02010 -0.014216 0.00352

 

*time.missouri.e 10.10.10.10 2 256 377 0.02060 -0.012398 0.00449

 

 

As verified in tcpdump:

 

[root@ltm-dc01:Active] config tcpdump -ni 0.0 udp port 123

 

tcpdump: listening on 0.0

 

14:12:10.705663 802.1Q vlan10 P0 10.10.10.240.ntp > 10.10.10.10.ntp: v3 sym_act strat 0 poll 10 prec -6

 

14:12:10.706130 802.1Q vlan10 P0 10.10.10.10.ntp > 10.10.10.240.ntp: v3 sym_pas strat 3 poll 10 prec -16 (DF) [tos 0x10]