Defining Forwarders
You can specify a domain for which forwarding should occur. The forwarder definition is by a list of names of servers or a list of IP addresses with an optional port number, or both.
Note |
You can specify IPv4 and/or IPv6 addresses and for the changes to take effect, you must reload the CDNS server. |
Tip |
To force a caching DNS server to only talk to a forwarder, define a forwarder for the DNS root (.). |
Note |
CDNS by default does not allow access to AS112 and RFC1918 reverse zones. These are the reverse zones for IP address ranges that are reserved for local use only. To access these zones, define an exception or forwarder for the reverse zones that are defined locally. |
Local Basic or Advanced Web UI
To define a forwarder:
Procedure
Step 1 |
From the Design menu, choose Forwarders under the Cache DNS submenu . This opens the List/Add Forwarders page. |
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Step 2 |
Click the Add Forwarders icon in theForwarders pane to open the Add DnsForwarder dialog box. |
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Step 3 |
Enter the name of the zone to be forwarded as the name and click Add DnsForwarder .
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Step 4 |
In the Edit Forwarders page, enter the hostname, and click Add Host or enter the IP address for the forwarder then click Add Address. |
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Step 5 |
Click Save. |
CLI Commands
Use the following cdns commands to:
- Specify the address (or space-separated addresses) of nameservers to use as forwarders, use cdns addForwarder .
- List the current forwarders, use cdns listForwarders .
- Edit your forwarder list, you must remove any offending forwarder and reenter it.
- Remove a forwarder or list
of forwarders, use
cdns
removeForwarder .
Note
For any change to the forwarders to take effect, you should restart the CDNS server.