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DNS Request
Information
Request
WAN Port
Monitoring Module
WAN 1
WAN 2
Authoritative
Domain Name
Server Module
Load Balancing
Algorithm
1
6
7
3
8
2
5
4
9
Web or FTP
Server
10
XC-DPG602 & 603 as an Authoritative DNS:
Note: This example uses WAN 1 as the initial recipient for the request of a domain name.
A web browser makes a request for a domain name. This request is received by WAN 1.
The domain name request is transferred and processed through the Authoritative DNS Module.
The DNS Module then asks the WAN Port Monitoring Module to provide the IP address of the
requested web server.
The WAN Port Monitoring Module service checks the current load on WAN 1 and WAN 2.
The Load Balance Algorithm is applied to the request. This holds the Gateway’s user preferences
and setting values including load-share and load balance type.
The Load Balancing Algorithm determines that WAN 2 has the least amount of traffic sessions
and therefore instructs the DNS Module to use WAN 2.
A reply from the Gateway is then sent back through WAN 1 to the source of the DNS request.
The web browser receives the Gateway’s reply and is forwarded to the domain name’s respective
IP address. The web browser will now retrieve the information that was requested.
The information request is then directed through WAN 2.
The information requested from the web browser is now accessed on the web or FTP server
loaced behind the Gateway
An example of the Inbound Load Balancing function for the
XC-DPG602 & 603 Gateways:
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