Kerio Tech Firewall6 - Manual (Page 90)

Chapter 7 Traffic Policy
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dropped. Therefore, it is recommended to put all rules for mapped services at the top of
the table of traffic rules.
Note: If there are separate rules limiting access to mapped services, these rules must
precede mapping rules. It is usually possible to combine service mapping and access
restriction in a single rule.
Multihoming
Multihoming is a term used for situations when one network interface connected to the In-
ternet uses multiple public IP addresses. Typically, multiple services are available through
individual IP addresses (this implies that the services are mutually independent).
In the local network a web server web1 with IP address 192.168.1.100 and a web server web2
with IP address 192.168.1.200 are running in the local network. The interface connected to
the Internet uses two public IP addresses — 63.157.211.10 and 63.157.211.11. We want
the server web1 to be available from the Internet at the IP address 63.157.211.10, the server
web2 at the IP address 63.157.211.11.
The two following traffic rules must be defined in WinRoute to enable this configuration:
Figure 7.24 Multihoming — web servers mapping
Source
Any (see the previous example referring to mapping of single service).
Destination
An appropriate IP address of the interface connected to the Internet (use the Host option
for insertion of an IP address).
Service
Service which will be available through this interface (the HTTP service in case of a Web
server).
Action
Select the Allow option, otherwise all traffic will be blocked and the function of port
mapping will be irrelevant.
Translation
Go to the Destination NAT (Port Mapping) section, select the Translate to IP address option
and specify IP address of a corresponding Web server (web1 or web2).