Speed Touch Dns Resolving - Alcatel AST570 User Manual

15 Networking Services - DNS

15.1 Speed Touch DNS Resolving

Introduction
Local DNS resolving
Example of local DNS
resolving
Result of local DNS
resolving
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The AST570 features a DNS server for the locally attached PCs
and as DNS relay for non local DNS hostnames.
The same mechanism for resolving computer names to IP
addresses when browsing the Internet, applies to your local
network.
Instead of using the IP addresses for a local IP node e.g.
10.0.0.138 for the AST570, you can give your nodes names and
let a DNS server, e.g. the AST570 itself, do the resolving.
In the example, a (W)LAN is built around the AST570.
In this scenario, it is assumed that the AST570 acts as DHCP
server, and as DNS server for the local network.
During start up, a first PC launches a DHCP request on the
(W)LAN.
One of the fields in the DHCP request contains the computer
name e.g. YourPC.
The AST570 reacts by intercepting this request and returns
a DHCP reply containing:
The IP address for his computer, e.g. 10.0.0.1
"
The local domain name, e.g. lan (default)
"
The IP address of the local DNS server, e.g. 10.0.0.138 being
"
the AST570 (default).
A second PC, named MyPC, is powered on and is configured via
a DHCP reply as below:
The IP address for his computer, e.g. 10.0.0.2
"
The local domain name, i.e. lan
"
The IP address of the local DNS server, i.e. 10.0.0.138.
"
In the example scenario, it is now possible to ping both PCs,
MyPC and YourPC, by referring to their computer names instead of
their IP addresses.
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