PLANET MH-1000 - Manual (Page 18)

Multi-Homing Security Gateway User’s Manual
2.5.2 DNS Inbound Load Balancing
DNS Inbound Load Balancing allows MH-1000 to intelligently manage inbound traffic based on
the amount of load of each WAN connection by assigning the IP address with the lowest traffic
load to incoming requests.
Built-in DNS
S
192.168.2.2
192.168.2.3
FTP
HTTP
200.200.200.1
www.mydomain.com
200.200.200.1
Authoritative Domain Name Server
d i
100.100.100.1 100.100.100.1
DNS Request
DNS Reply
Built-in DNS
S
www.mydomain.com
Heavy load on WAN
Heavy load on WAN
WAN 1
WAN 2
WAN 1
WAN 2
100.100.100.1
200.200.200.1
DNS Reply
DNS Request
f 192.168.2.2
192.168.2.3
FTP
HTTP
In the above example, an FTP server (IP_192.168.2.2) and an HTTP server (IP_192.168.2.3) are
connected to the Internet via WAN1 (IP_200.200.200.1) and WAN2 (IP_100.100.100.1) on MH-1000.
Remote PCs are attempting to access the servers via the Internet by making a DNS request, entering a
URL (www.mydomain.com).
Using a load balancing algorithm, MH-1000 can direct incoming requests to either WAN port based on the
amount of load each WAN port is currently experiencing. If WAN2 is experiencing a heavy load, MH-1000
responds to incoming DNS requests with WAN1.
By balancing the load between WAN1 and WAN2, your MH-1000 can ensure that inbound traffic is
efficiently handled, making sure that both ports are equally sharing the load and preventing situations
where service is slow because one port is completely saturated by inbound traffic.
Please refer to appendix D for example settings.
A typical scenario of how traffic is directed with DNS Inbound Load Balancing is illustrated below:
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