syslog over tcp and define management IP as source

Hello,

For your asked you have to a add route to force traffic passing by management route.

You have to know that routing for mgmt is different of business routing.

SO connect to F5 using cli and enter in tmsh then add your route:

tmsh create /sys management-route  network / gateway 

example

tmsh create /sys management-route syslog-route network  172.28.68.42/32 gateway 1.1.1.1

1.1.1.1 will be the management gw

Then save configuration

tmsh save /sys config

This article describe routing trough mgmt interface: https://support.f5.com/csp/article/K13284

Keep me update,

Regards,