Billion Electric Company BiGuard 30 - Manual (Page 29)

29
In the example above, the client is making a DNS request. The request is sent to the
DNS server of BiGuard 30 through WAN2 (1). WAN2 will route this request to the
embedded DNS server of BiGuard 30 (2). BiGuard 30 will analyze the bandwidth of
both WAN1 and WAN2 and decide which WAN IP to reply to the request (3). After the
decision is made, BiGuard 30 will route the DNS reply to the user through WAN2 (4).
The user will receive the DNS reply with the IP address of WAN1 (5). The browser
will initiate an HTTP request to the WAN1 IP address (6). The HTTP request will be
send to BiGuard 30’s URL Host Map (7). The Host Map will then redirect the HTTP
request to the HTTP server (8). The HTTP server will reply (9). The URL Host Map will
route the packet through WAN1 to the user (10). Finally, the client will receive an
HTTP reply packet (11).
2.6 Virtual Private Networking
A Virtual Private Network (VPN) enables you to send data between two computers
across a shared or public network in a manner that emulates the properties of a
point-to-point private link. As such, it is perfect for connecting branch offices to
headquarters across the Internet in a secure fashion.
WAN 1
WAN 2
DNS Server
Bandwidth Monitor
1
2
3
4
5
6
URL Host Map
7
8 9
10
DNS Request
DNS Reply
HTTP Request
HTTP Reply 11
HTTP Server