Enabling The Dns Relay; Dns Relay Diagram - Patton electronics SmartWare R.3.20 Software Configuration Manual

SmartWare Software Configuration Guide
You can test the DNS server configuration using the
Example: Testing DNS server configuration
node(cfg)#dns-lookup www.patton.com
Name: www.patton.com
Address: 209.49.110.5
Note
The DNS resolver automatically learns domain name servers if it receives
them through PPP or DHCP protocols. You can verify that the DNS
resolver has received domain name servers by using the
command as follows:
node(cfg)#show dns-client
The following DNS servers are currently available:
Configured IP: 195.186.1.110
Discovered IP: 81.221.250.10
Discovered IP: 81.221.252.10
node(cfg)#
Configured IP indicates a domain name server that has been configured as
shown at the beginning of this section. Discovered IP indicates a domain
name server that was learned automatically.
User's PC
DNS Client
TCP UDP
IP
ENET

Enabling the DNS relay

DNS (Domain Name System) is a distributed database used in IP networks to provide the numerical IP
address for a URL's host name. There are DNS Servers, DNS Relays, and DNS Clients (see
clients send queries with the host-name of interest to the DNS Server. The DNS server responds with the IP
DNS configuration task list
dns-lookup
Node
DNS Relay
TCP UDP
IP IP
Localized DNS
ENET ENET W WAN
query traffic
Figure 39. DNS relay diagram
22 • DNS configuration
command as follows:
show dns-client
(Not used)
(Not used)
Remote Location
(somewhere on
DNS Server
TCP
IP
DNS query on
the WAN side
WA WAN
the Internet)
UDP
figure 39). DNS
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