4. F5 DNS Listener
Summary
TLDRThis video tutorial delves into the implementation of an F5 DNS listener, a feature that allows the F5 DNS device to handle DNS queries either locally or by forwarding them to the correct resource. The script guides viewers through creating a DNS listener, setting up IP address translation, and applying a DNS profile with DNS Express capabilities. It also demonstrates querying the DNS Express database through the listener for the 'ro-code.com' zone, showcasing the effectiveness of the secondary authoritative DNS server setup in the F5 DNS device.
Takeaways
- 📚 The video discusses the implementation of an F5 DNS listener, which is a feature that allows the F5 DNS device to take over DNS queries.
- 🔍 The F5 DNS device can process DNS queries locally or forward them to the appropriate resource, highlighting its flexibility in handling DNS requests.
- 💻 A listener is essential for DNS resolution scenarios unless the F5 is running a local BIND service, indicating the listener's importance in most DNS operations.
- 🌐 The previous section covered the setup of DNS Express as a secondary authoritative DNS server for the 'ro-code.com' zone, providing context for the current discussion.
- 📝 DNS Express database contents were verified using various methods, including DNS dump, to ensure the server's accuracy and reliability.
- 🆕 In this section, a new DNS listener is created, named 'DNS on the line listener one', demonstrating the process of setting up a new listener.
- 🔑 The listener listens to port 53 by default, which is the standard port for DNS queries, emphasizing the adherence to standard protocols.
- 🔄 Source address translation can be enabled for the listener to ensure that DNS responses are routed through the F5 device, showcasing F5's address translation capabilities.
- 🛡️ A DNS profile with DNS Express capability is applied to the listener, which can be the default profile or a newly created one, for enhanced DNS functionality.
- 🔍 DNS Express must be enabled in the DNS profile for the listener to query and resolve DNS names effectively, underlining a crucial configuration step.
- 💻 Demonstration of querying the DNS Express database through the F5 DNS listener using command prompt, showing practical usage of the setup.
Q & A
What is the main focus of the video?
-The video focuses on discussing and implementing an F5 DNS listener, which allows the F5 DNS device to take over DNS queries and process them locally or forward them to the appropriate resource.
What is the purpose of a DNS listener in F5 DNS?
-A DNS listener in F5 DNS is required for any DNS resolution scenario, except when F5 runs a local BIND service. It listens to DNS queries and either processes them locally or forwards them as needed.
What was implemented in the previous section of the course?
-In the previous section, DNS Express was implemented as a secondary authoritative DNS server for the zone ro-code.com, and its database contents were verified using various methods.
How can one verify the contents of the DNS Express database?
-The contents of the DNS Express database can be verified using methods such as DNS X dump, which shows the database including different host records.
What is the default port for a DNS listener?
-The default port for a DNS listener is 53, which is dedicated to DNS queries.
What IP address is considered for the Listener IP address in the video?
-The IP address 192.168.2.1 is considered for the Listener IP address in the video.
What is the role of Source Address Translation in the context of the DNS listener?
-Source Address Translation ensures that the DNS response is routed through the F5 device, which is discussed in the F5 LTM course.
What is a DNS profile and how is it applied in the context of the video?
-A DNS profile is a configuration applied in the DNS section that includes DNS Express capabilities. It can be the default DNS profile or a newly created one, used to manage DNS listener settings.
How can one query the DNS Express database through the F5 DNS listener?
-One can query the DNS Express database through the F5 DNS listener by using command prompt with 'nslookup' and setting the server to the listener IP address, then querying the desired host records.
What does the result of the query demonstrate about the F5 DNS device?
-The result of the query demonstrates that the F5 DNS device is working properly as a secondary authoritative DNS server, resolving DNS names via DNS Express for the specified zone.
What additional records were mentioned in the script as being part of the DNS Express database?
-The script mentioned 'host 2' and 'host 3' as additional records that were part of the DNS Express database.
Outlines
🔊 Implementing F5 DNS Listener
This paragraph introduces the topic of the video, which is the implementation of an F5 DNS listener. The F5 DNS listener allows the F5 DNS device to handle DNS queries either by processing them locally or forwarding them to the appropriate resource. The video will demonstrate how to set up a listener for DNS resolution scenarios, except when F5 is running a local BIND service. The previous section's discussion on DNS Express as a secondary authoritative DNS server for the 'ro-code.com' zone is referenced, and the viewer is reminded of the verification methods used to check the DNS Express database. The section concludes with the intention to create a DNS listener to query the DNS Express database through the F5 DNS listener.
Mindmap
Keywords
💡F5 DNS
💡DNS listener
💡DNS resolution
💡DNS Express
💡Authoritative DNS server
💡DNS database
💡Source address translation
💡DNS profile
💡Command prompt
💡NS lookup
Highlights
Introduction to F5 DNS listener and its capability to take over DNS queries.
F5 DNS device processes DNS queries locally or forwards them to the appropriate resource.
Explanation of the necessity of a listener for DNS resolution scenarios, except when F5 runs a local bind service.
Demonstration of DNS Express as a secondary authoritative DNS server for the zone ro-code.com.
Verification of DNS Express database contents using DNS X dump.
Creation of a DNS listener named 'DNS on the line listener one' to listen on port 53.
Setting the Listener IP address to 192.168.2.1 for address translation.
Enabling Source address translation to ensure DNS responses are routed through the F5 device.
Discussion on F5 Source not in LTM course and its availability for free access.
Application of a DNS profile with DNS Express capability in the DNS profile section.
Option to use the default DNS profile or create a new one for the DNS listener.
Configuration completion in the DNS delivery and then profile and then DNS section.
Enabling DNS Express in the DNS profile, which is enabled by default.
Querying a DNS listener through command prompt using NS lookup.
Setting the server to listener IP address 21001 for DNS queries.
Querying various records in the ro-code.com zone to demonstrate proper functioning.
Verification of DNS Express as a working secondary authoritative DNS server on the F5 DNS device.
Transcripts
you're welcome to another video of the
course F5 bigp DNS in this section I'm
going to discuss and Implement F5 DNS
listener which gives the capability to
F5 DNS device to Tak over DNS queries F5
DNS device process DNS queries locally
or forward them to the appropriate
resource a listener is required for any
DNS resolution scenario except when the
F5 run local bind
service in the previous section we
implemented DNS Express as a secondary
authoritative DNS server for the Zone
ro- code.com and verified the contents
of DNS Express database using various
methods just to double check with one of
the methods DNS X dump you see the
database of DNS Express including h one
host two and host
3 however in this section we will create
a DNS listener and query DNS Express
database through F5 DNS
listener in the section DNS delivery
listener GTM
listener we can create a new DNS
listener we give a
name for example DNS on the line
listener
one
Advance listener listen to the port 53
by default which is the port dedicated
to the DNS query for listener we
consider the IP address
192 168
to1 as The Listener IP address in the
address
translation section
we can enable Source address translation
if we want to ensure that the DNS
response is routed through F5 device we
have already discussed F5 Source not in
LTM course which is free and you can
access in the section DNS
profile we apply a DNS profile with DNS
Express
capability we can use the existing
default DNS profile or create a new
one and no other
configuration for DNS listener for the
express database and
finish in the section DNS delivery and
then profile and then DNS s we create a
new DNS profile or edit an existing DNS
profile for this section where we create
a listener to query and resolve DNS
names via DNS exppress we need to Ure
that DNS Express is
enabled in the DNS profile which is
enabled by
default then you are allowed to qu a 5
DNS list listener through command prompt
and NS lop and we set the server to
listener IP address which is
21001 and then we will query host one.
r- code.com or any other record in
rod.com
zone and the result shows that DNS
Express or secondary authoritative DNS
server is working properly in F5 DNS
device and also for host 2 and host 3 we
have already seen in the
database
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