Kerio Tech KERIO WINROUTE FIREWALL 6, Administrator'S Manual

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Chapter 7 Traffic Policy
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Default — all necessary protocol inspectors (or inspectors of the services listed in the
Service entry) will be applied on traffic meeting this rule.
• None — no inspector will be applied (regardless of how services used in the Service
item are defined).
• Other — selection of a particular inspector which will be applied to traffic meeting this
rule (all WinRoute’s protocol inspectors are available). No other protocol inspector will
be applied to the traffic, regardless of settings of services in the Service section.
Do not use this option unless the appropriate traffic rule defines a protocol belonging
to the inspector. Functionality of the service might be affected by using an inappro-
priate inspector.
For more information, refer to chapter 7.7 .
Note: Use the Default option for the Protocol Inspector item if a particular service (see the
Service item) is used in the rule definition (the protocol inspector is included in the service
definition).
7.4 Basic Traffic Rule Types
WinRoute traffic policy provides a range of network traffic filtering options. In this chapter
you will find some rules used to manage standard configurations. Using these examples you
can easily create a set of rules for your network configuration.
IP Translation (NAT)
IP translation (as well as Internet connection sharing) is a term used for the exchange of a
private IP address in a packet going out from the local network to the Internet with the IP
address of the Internet interface of the WinRoute host. This technology is used to connect
local private networks to the Internet by a single public IP address.
The following example shows an appropriate traffic rule:
Figure 7.21 A typical traffic rule for NAT (Internet connection sharing)
Source
The Trusted / Local interfaces group. This group includes all segments of the LAN con-
nected directly to the firewall. If access to the Internet from some segments is supposed
to be blocked, the most suitable group to file the interface into is Other interfaces .
If the local network consists of cascaded segments (i.e. it includes other routers ), it is not
necessary to customize the rule in accordance with this fact — it is just necessary to set
routing correctly (see chapter 18.1 ).