Cirkuit Planet MH-1000 Manuale Utente

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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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