For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Rohit_Singla_17's avatar
Rohit_Singla_17
Icon for Nimbostratus rankNimbostratus
Sep 19, 2016

GTM response with all pool members down

Hi Experts, I have 2 Pool Members in my GTM. One Pool has 2 Members, other has 1. Alternate and Fallback Load Balancing set to none. Last Resort Pool is also set to none.

 

If I disable my both pools, GTM starts responding with all 3 A records. is this normal or what will be the expected behaviour when all pools are down/disabled.

 

application delivery
BIG-IP
BIG-IP DNS
security

1 Reply

  • Yazan_Khader's avatar
    Yazan_Khader
    Icon for Nimbostratus rankNimbostratus
    Sep 20, 2016

    A wide IP contains two or more pools. The Global Traffic Manager load balances requests, first to a specific pool, and then to a specific virtual server in the selected pool. If the preferred, alternate, and fallback load balancing methods that are configured for the pool or virtual server fail, then the requests fail, or the system falls back to DNS.

     

    Drop Packet mode :

     

    When you specify the Drop Packet load balancing mode, the Global Traffic Manager does nothing with the packet, and simply drops the request. Note: A typical Local DNS server iteratively queries other authoritative name servers when it times out on a query. F5 Networks recommends that you use the Drop Packet load balancing mode only for the fallback method. The Global Traffic Manager uses the fallback method when the preferred and alternate load balancing modes do not provide at least one virtual server to return as an answer to a query.