DNS configuration task list
305
SmartWare Software Configuration Guide
28 • DNS configuration
address. DNS Relay agents maintain a cache of host names and IP addresses, much smaller than a DNS Server.
It acts as a liaison between the DNS Server and the DNS client
Advantages in configuring a DNS Relay in the SmartNode are:
•
Network traffic is reduced since only a single query is sent to the DNS server although numerous users may
be requesting an IP address for the same host name
•
The DNS queries are localized between the Users and the SmartNode which reduces congestion on the
WAN side of the SmartNode
•
Multiple DNS servers can be consulted from the SmartNode
The DNS resolver must be configured before you can use the DNS relay feature (see section
“Enabling the
DNS resolver”
on page 303 to enable the DNS resolver, if you have not already done so).
Do the following to enable the DNS relay feature:
Mode:
Configure
Example
: Enabling DNS relay
The following example shows how to enable the DNS relay feature.
node>enable
node#configure
node(cfg)#dns-relay
Note
If a DHCP server profile has been set up, you can announce the SmartNode
as domain name server to the DHCP clients as follows:
node(cfg)#profile dhcp-server LAN
node(pf-dhcps)[LAN]#domain-name-server <ip-address>
Where
ip-address
must be the IP address of the SmartNode IP interface to
which the DHCP clients are connected.
Step
Command
Purpose
1
node
(cfg)#dns-relay
Enables DNS relay feature
Содержание SmartNode Series
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Страница 635: ...635 Appendix A Terms and definitions Chapter contents Introduction 636 SmartWare architecture terms and definitions 636 ...
Страница 641: ...641 Appendix B Mode summary Chapter contents Introduction 642 ...
Страница 648: ...648 Appendix D Internetworking terms acronyms Chapter contents Abbreviations 649 ...
Страница 653: ...653 Appendix E Used IP ports available voice codecs Chapter contents Used IP ports 654 Available voice codecs 655 ...