Forum Discussion
I'm guessing that you're probably using: the default partition(Common) and route domain(0), you have a default route configured on the network section of the BigIP, and you have a default route for the management port. If that's the case, and you want authentication traffic to originate from the management port. you need to add static routes on the management port. By default BigIP prefers the default route for the default route domain(0) over the default one in the management port for traffic originating from the device like NTP, snmp traps, authentication, etc. If you want the traffic to originate from the management port's IP address you must add the static routes through the CLI.
K13284: Overview of management interface routing (11.x - 12.x) https://support.f5.com/csp/article/K13284
K3669: Overview of management interface routing (9.x - 10.x) https://support.f5.com/csp/article/K3669
Hope this helps!
Can you run the following command to list the routes on the management port?
From bash: tmsh list /sys management-route
or from tmsh: list /sys management-route