Billion BiGuard 50G User Manual page 30

11
HTTP Reply
WAN 1
10
URL Host Map
9
HTTP Server
In the example above, the client is making a DNS request. The request is sent to the
DNS server of BiGuard 50G through WAN2 (1). WAN2 will route this request to the
embedded DNS server of BiGuard 50G (2). BiGuard 50G 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 50G 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 50G'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).
6 HTTP Request
7
DNS Server
Bandwidth Monitor
8
30
5 DNS Reply
1
DNS Request
2
WAN 2
3
4