Black Box Corporation
1000 Park Drive, Lawrence, PA 15055-1018
USA, Canada: www.blackbox.com,
EU, Africa, Asia, South America, Australia: www.blackbox.eu
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2.5.2 DNS Inbound Load Balancing
DNS Inbound Load Balancing allows Firetunnel 30 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.
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 Firetunnel 30. 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, Firetunnel 30 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, Firetunnel 30
responds to incoming DNS requests with WAN1. By balancing the load between
WAN1 and WAN2, your Firetunnel 30 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 H for example settings.
Built-in DNS
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
100.100.100.1
100.100.100.1
DNS Request
DNS Reply
Built-in DNS
192.168.2.2
192.168.2.3
FTP
HTTP
www.mydomain.com
DNS Request
DNS Reply
Heavy load on WAN 2
Heavy load on WAN 1
200.200.200.1
100.100.100.1
WAN 2
WAN 1
WAN 1
WAN 2
