Default Route Failure

Please I have another situation here. this case involves a link controller. F5 sits between two networks A and B A is the ISP network subnet and B is the internal network F5 could ping both A and B as well as the internet successively and it could also ping the internal network.

However, both networks A and B could not reach eachother even though there are routes defined on F5 to allow that. The default-gateway-route even specifies the direction for packets, yet, these two aren't getting to eachother but they can both ping F5 in the middle.

i have a listener defined for both networks with the IPs assigned to their respective interfaces, both for UDP and TCP...it's still a no no....

Please help!

Thank you What might the problem be please?