--> A listener is an object that listens for the DNS queries on the DNS System.
--> F5 DNS has to receive the query on the Listener in order to perform the DNS resolution.
--> A listener is required for any DNS resolution except typical BIND.
--> A listener is assigned to a specific IP address and protocol UDP or TCP on which the BIG-IP DNS receives and processes traffic.
--> DNS listener address receives a DNS request, the request is forwarded to the gtmd process.
--> The gtmd process then processes the traffic locally or forwards the traffic to the appropriate resource.
--> The BIG-IP DNS listener objects can be configured to use the TCP and UDP protocols.
--> If you want to import zones to the BIG-IP DNS with a zone transfer from other DNS servers the DNS needs to be configured with a listener IP address using the TCP protocol.
--> DNS uses TCP listener when the DNS UDP response is larger than 4096 bytes.
--> F5 DNS has to receive the query on the Listener in order to perform the DNS resolution.
--> A listener is required for any DNS resolution except typical BIND.
--> A listener is assigned to a specific IP address and protocol UDP or TCP on which the BIG-IP DNS receives and processes traffic.
--> DNS listener address receives a DNS request, the request is forwarded to the gtmd process.
--> The gtmd process then processes the traffic locally or forwards the traffic to the appropriate resource.
--> The BIG-IP DNS listener objects can be configured to use the TCP and UDP protocols.
--> If you want to import zones to the BIG-IP DNS with a zone transfer from other DNS servers the DNS needs to be configured with a listener IP address using the TCP protocol.
--> DNS uses TCP listener when the DNS UDP response is larger than 4096 bytes.
--> DNS uses the TCP listener to resolve the DNS records which are configured with DNSSEC.
--> DNS uses the UDP listener to resolve the normal DNS query/responses without DNSSEC
--> A Listener configured on DNS can do following tasks:
1) Intelligent DNS Resolution ( By configuring WIDE IP)
2) Accelerated DNS resolution ( By using DNS Express or Assigning Pool of DNS Servers to the Listener)
3) DNSSEC
--> A wildcard listener is a special listener that is assigned an IP address of 0.0.0.0 and the DNS query port (port 53). When you want BIG-IP DNS to respond to DNS queries coming into your network, regardless of the destination IP address of the given request, you use a wildcard listener.
--> Listeners are stored in /config/bigip.conf file.
--> A Listener configured on DNS can do following tasks:
1) Intelligent DNS Resolution ( By configuring WIDE IP)
2) Accelerated DNS resolution ( By using DNS Express or Assigning Pool of DNS Servers to the Listener)
3) DNSSEC
--> A wildcard listener is a special listener that is assigned an IP address of 0.0.0.0 and the DNS query port (port 53). When you want BIG-IP DNS to respond to DNS queries coming into your network, regardless of the destination IP address of the given request, you use a wildcard listener.
--> Listeners are stored in /config/bigip.conf file.
--> If you want the Listener to forward the DNS query to other external DNS Servers then disable the bind feature using DNS Profile (Use Bind Server on Big IP set to be disabled).
--> A Listener can be configured in three ways:
1) Standalone BIG IP System: Self IP address of the DNS System ( You have only one DNS server in the network)
2) Redundant BIG IP System: Floating Self IP address of the DNS System in the case of Active/Passive and Self IP address of the DNS System in the case of Active/Active BIG IP DNS.
3) Anycast Listener: With the help of the routing module on F5 BIG IP DNS we can use the same IP address on Listener on multiple DNS.
--> To configure the Listener on the F5 DNS navigate to ( DNS > Delivery > Listeners > Listeners List > New
--> A Listener can be configured in three ways:
1) Standalone BIG IP System: Self IP address of the DNS System ( You have only one DNS server in the network)
2) Redundant BIG IP System: Floating Self IP address of the DNS System in the case of Active/Passive and Self IP address of the DNS System in the case of Active/Active BIG IP DNS.
3) Anycast Listener: With the help of the routing module on F5 BIG IP DNS we can use the same IP address on Listener on multiple DNS.
--> To configure the Listener on the F5 DNS navigate to ( DNS > Delivery > Listeners > Listeners List > New
Reference: F5.com
Md.Kareemoddin,
CCIE # 54759
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