Chapter 4 Configuring Cisco Access Registrar 4.2

Configuring Dynamic DNS

You enable dynamic DNS updates by creating and configuring new Resource Managers and new RemoteServers, both of type dynamic-dns. The dynamic-dns Resource Managers specify which zones to use for the forward and reverse zones and which Remote Servers to use for those zones. The dynamic-dns Remote Servers specify how to access the DNS Servers.

Before you configure Cisco AR you need to gather information about your DNS environment. For a given Resource Manager you must decide which forward zone you will be updating for sessions the resource manager will manage. Given that forward zone, you must determine the IP address of the primary DNS server for that zone. If the dynamic DNS updates will be protected with TSIG keys, you must find out the name and the base64 encoded value of the secret for the TSIG key. If the resource manager should also update the reverse zone (ip address to host mapping) for sessions, you will also need to determine the same information about the primary DNS server for the reverse zone (IP address and TSIG key).

If using TSIG keys, use aregcmd to create and configure the keys. You should set the key in the Remote Server or the Resource Manager, but not both. Set the key on the Remote Server if you want to use the same key for all of the zones accessed through that Remote Server. Otherwise, set the key on the Resource Manager. That key will be used only for the zone specified in the Resource Manager.

To configure Dynamic DNS, complete the following steps:

Step 1 Launch aregcmd.

Step 2 Create the dynamic-dns TSIG Keys:

cd /Radius/Advanced/DDNS/TSIGKeys

add foo.com

This example named the TSIG Key, foo.com, which is related to the name of the example DNS server we use. You should choose a name for TSIG keys that reflects the DDNS client-server pair (for example, foo.bar if the client is foo and the server is bar), but you should use the name of the TSIG Key as defined in the DNS server.

Step 3 Configure the TSIG Key:

cd foo.com

set Secret <base64-encoded string>

The Secret should be set to the same base64-encoded string as defined in the DNS server. If there is a second TSIG Key for the primary server of the reverse zone, follow these steps to add it, too.

Step 4 Use aregcmd to create and configure one or more dynamic-dns Remote Servers.

Step 5 Create the dynamic-dns remote server for the forward zone:

cd /Radius/RemoteServers

add ddns

This example named the remote server ddns which is the related to the remote server type. You can use any valid name for your remote server.

Step 6 Configure the dynamic-dns remote server:

cd ddns

set Protocol dynamic-dns

 

 

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Cisco Systems 4.2 manual Cd /Radius/Advanced/DDNS/TSIGKeys Add foo.com, Cd foo.com Set Secret base64-encoded string

4.2 specifications

Cisco Systems, a global leader in IT and networking solutions, has consistently evolved to meet the demands of modern enterprises. One of its noteworthy offerings is Cisco Systems 4.2, a version that embodies a significant leap in networking technology and capability. With its rich set of features, Cisco Systems 4.2 caters to a wide range of industries, facilitating enhanced performance and security.

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Collaboration tools have also been enhanced in this version. Cisco Systems 4.2 integrates advanced communication solutions that empower teams to collaborate in real time, regardless of their geographical location. Features such as high-definition video conferencing, secure messaging, and file sharing enhance productivity and foster innovation across teams.

In summary, Cisco Systems 4.2 stands out as a forward-thinking networking solution with key features such as scalability, advanced security, intelligent automation, flexible infrastructure, and enhanced collaboration tools. These characteristics position Cisco Systems 4.2 as an invaluable asset for enterprises striving for digital transformation in an increasingly interconnected world. The ongoing innovation reflects Cisco's commitment to delivering cutting-edge technology solutions that drive business success and resilience.