dynamic signature detection

tcpdump with filter on ntp shows anything?

Have you checked your routing + firewall (if any) inbetween?

Just to mention...NTP won't take management interface by default but follow the routing table. If you want to "force" it through management interface, you have to add management-routes. I've seen such case many times.

Hi amolari,

Great thanks brother, the issue was on management-routes which was not added for old and new IP in Standby F5. now both are working fine.

Hi

I got this to work by adding specific routes even though I had a default management-route. Try this:

tmsh create /sys management-route MyNTPserver network x.x.x.x/255.255.255.255 gateway y.y.y.y tmsh save /sys config bigstart restart ntpd

Also, F5 documentation states:

"When the BIG-IP system starts, the ntpd process starts before the system loads the TMM network configuration, and the ntpd process attempts to use the management network to reach the NTP server. However, the attempt fails because the NTP server is on the TMM network."

(Reference: https://support.f5.com/kb/en-us/solutions/public/7000/000/sol7017.html)

Regards, Sharmeelan