Using BIG IP LTM on a internal only network, for management and load balancing

Hi! You need to have at least one self IP where the traffic can come in. The management interface is solely for management traffic and can't be used for actual traffic.

If I were you I'd do it this way:

1. Connect to the management interface via console (if it's a virtual machine) or directly to the management port if it's a physical machine.
2. Configure a temporary ip for management, ie 10.0.0.1 (this will not be used later)
3. Then create a self IP via tmsh:

tmsh create net self selfipname address 192.168.69.50/24 allow-service default vlan External

Replace selfipname with then name you want for the self IP (only used for labeling purposes)

Now you should be able to connect to the IP you chose and manage the BigIP while traffic will reach your VIPs.

Let me know if my instructions were not clear.

Good luck!