Westermo RedFox Series - Manual (Page 410)

Westermo OS Management Guide
Version 4.17.0-0
19.3.3 DNS client - setting DNS server and dynamic DNS
Most users find it is easier to refer to Internet hosts using domain names, e.g.,
http://www.example.com , than using IP addresses, e.g., http://93.184.216.
119 . To facilitate the use of the Domain Name System (DNS), WeOS supports
configuration of up to two DNS server entries. It is also possible to configure a
domain search path. These settings can also be acquired dynamically via DHCP
or PPP (see
section 19.2.6 ).
Use of domain names on a switch can be convenient, e.g., when setting up ping
triggers, VPN peers or when troubleshooting with tools such as ping or traceroute,
see
section 7.1.10 .
It is also convenient to communicate with the switch using domain names. When
the switch acquires its IP address dynamically (via DHCP or PPP), maintaining
the DNS server entry is cumbersome. To manage this situation, WeOS includes
support for dynamic DNS (DDNS). With DDNS enabled, the switch will update its
DNS server entry automatically when acquiring a new IP address.
Examples of supported DDNS providers are:
❼ dyndns: http://www.dyndns.org ,
❼ freedns: http://freedns.afraid.org
❼ no-ip: http://www.no-ip.com
See the CLI or Web online help for a more up-to-date list.
19.3.4 Proxy DNS server
WeOS units are able to act as DNS proxy servers (enabled by default). When
enabled, the unit will act as a DNS server and respond to DNS queries for known
hosts:
❼ either statically added by the ”host” (
section 19.7.8 ), see also the ”show
ip host” ( section 19.7.28 ) command, or
❼ hosts for which this unit acts as DHCP server (
chapter 22 ), see also the
”show dhcp-clients” ( section 22.3.20 ) command .
As DNS proxy, the WeOS the unit will also act as a caching DNS forwarder; DNS
queries of unknown hosts are forwarded to the unit’s own DNS server (see the
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