DNS load balancing between ISP's

Hello Philip!

Your answer helped me a lot in designing the solution. And now is the part of the implementation... And I still have one thing that is not completely clear to me... How can I monitor the ISP's? Can I setup transparent icmp_gateway monitors that ping 8.8.8.8 and set them up per pool? But it doesn't seem to work.

If I do it your way (monitor the services as you wrote) I can never be sure if the ISP is really UP? Note the VIP's are setup in my LTM (I do have LTM...)

So a basic topology of mine is:

router (connected with 2 ISP's) - F5 (GTM/LTM/ASM) - FW - Servers

Thank you for your help! And I loved both your books, they helped me to my cert :)