Forum Discussion
fubarSUSHI
Altocumulus
AltocumulusLoad balancing two ISPs? With GTM or LTM?
Im assisting with an installation but Im trying to find a method to load balance two ISPs. We purchased a GTM license but everything looks like it should be done with an LTM that is on the outside p...
shaggy
Nimbostratus
Nimbostratus@Brian R. said it well - very similar to link controller (but hopefully easier/better because LC is like LTM+GTM lite)
also check out https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-implementations-11-1-0/2.html
Outbound ISP load-balancing uses LTM, inbound ISP load-balancing is DNS-based and uses GTM. Each public site that you want to load-balance between the ISPs will have a unique IP address in each ISPs public space, and the GTM will load balance by resolving the name to its address in either ISP space
fubarSUSHIAltocumulus
Altocumulus@Brian - correct. Im referencing outbound traffic only. I guess maybe I can call it "traffic shaping"
but that might be the inappropriate 'cisco' term. For all egress traffic... if I want http based egress traffic to use isp1 and all non-http based egress traffic to use isp2.
For ingress traffic... it sounds like you hit the nail on the head and I thank you for pointing link controller to me. Ingress traffic I am looking to use isp1 as my main connection and isp2 will be failover. I believe the GTM "dns" aspect should take care of this using cname records. And I always thought GTM is for 2 DCs only versus using it as such.
In the DNS portion... I will need to get my DNS provider to allow the GTM to be authoritative for a sub-domain. I assume I will need to use two name servers 1 for isp1 and 2 for isp2 and put them in a pool for the GTM side correct?
