Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Amr_Ali's avatar
Amr_Ali
Icon for MVP rankMVP
Apr 11, 2023

load balancing between different ISP

hello, I have a new implementation For F5 GTM and LTM to use  both of them to load balance between different ISP, how can make this implementation to make load balancing for outbound traffic, 
Amr_Ali's avatar
Amr_Ali
Icon for MVP rankMVP
Apr 12, 2023

thanks, Michael, please if you can provide me with documentation, 

 so we will need to make load balancing for outgoing traffic just LTM License, 

I want to ask if we need to make load balancing for incoming traffic in this case we will need GTM License and LTM 

MichaelOLeary's avatar
MichaelOLeary
Icon for Employee rankEmployee
Apr 13, 2023

Just sent you a link via private message, but I'd start here: https://techdocs.f5.com/en-us/bigip-15-0-0/big-ip-local-traffic-manager-implementations/configuring-isp-load-balancing.html

Yes, you want LTM and GTM modules included on your device. You need the GTM part for inbound because you will have multiple IP addresses for each application you choose to expose (1 IP address per ISP, probably), so you'll need to have your DNS queries resolve to the correct IP address, depending on how you want to load-balance incoming traffic.