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Forum Discussion

Harry1's avatar
Harry1
Icon for Nimbostratus rankNimbostratus
Dec 10, 2015

Need to understand listner in GTM

Hello friends,   if there is a configuration in GTM and showing listner confuguration as destination is GTM-self ip. then what does it mean? what could be the use cases and scenarios for listner. ...
application delivery
BIG-IP
Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Dec 10, 2015

Hi,

 

In LTM configuration, there are some listeners : virtual servers, NAT, SNATs

 

without listener, LTM does not handle trafic.

 

A GTM Listener create a LTM virtual server with a DNS profile to forward DNS requests to GTM.

 

When provisioning GTM, a BIND service is started locally and wideIPs are created as A records in BIND configuration.

 

The LTM best practice specify that is is recommended to not define a LTM on the same IP than SelfIP, but as the default behavior of DNS profile is if there is not any answer from GTM (pool members unavailable or no wideIP), the DNS request is sent to DNS, if Listener is created on the selfIP, the local BIND will answer for unmanaged DNS requests.

 

Stanislas