Kerio Tech Firewall6 User Manual
Page 73
7.1 Network Rules Wizard
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These rules are not created unless the option allowing access to a particular service is
enabled in step 5.
Note: In these rules, value for Source is also set to Any. The main reason for this is to
keep consistent with rules for mapped services (all these rules are defined in page 6 of the
wizard). Access to firewall services from the local network is, under normal conditions,
allowed by the Firewall traffic rule but this is not always true.
ISS OrangeWeb Filter
If ISS OrangeWeb Filter is used (a module for classification of Websites), this rule is used to
allow communication with corresponding databases. Do not disable this traffic, otherwise
ISS OrangeWeb Filter might not function well. In figure
for instance, the firewall’s
traffic is narrowed only to specific services. Without this rule, traffic of ISS OrangeWeb
Filter would be blocked.
NAT
This rule sets that in all
from the local network to the Internet, the source
(private) IP address will be replaced by the address of the Internet interface through
which the
is sent from the firewall. Only specified services can be accessed by the
Internet connection (the wizard, page 4).
The Source item of this rule includes the Trusted / Local interfaces group and the Destina-
tion item includes group Internet interfaces. This makes the rule appliable to any network
configuration. It is not necessary to change this rule whenever a new segment of the LAN
is connected or Internet connection is changed.
By default, the Trusted / Local interfaces group includes also a Dial-In interface, i.e. all
RAS clients connecting to this server can access the Internet with the NAT technology.
Local Traffic
This rule allows all traffic between local hosts and the firewall (i.e. the computer where
WinRoute is installed). In this rule, items Source and Destination include the Trusted /
Local interfaces group (see chapter
) and the special group Firewall.
By default, the Trusted / Local interfaces group includes also a Dial-In interface. This
means that the Local Traffic rule also allows traffic between local hosts and RAS
clients/VPN clients connected to the server.
If creating of rules for Kerio VPN was set in the wizard (the wizard, page 5), the Local
Traffic rule includes also special address groups All VPN tunnels and All VPN clients. This
implies that, by default, the rule allows traffic between the local network (firewall), remote
networks connected via VPN tunnels and VPN clients connecting to the WinRoute’s VPN
server.
Note: Access to the WinRoute host is not limited as the wizard supposes that this host
belongs to the local network. Limitations can be done by modification of an appropriate
rule or by creating a new one. An inconvenient rule limiting access to the WinRoute
host might block remote administration or it might cause some Internet services to be
unavailable (all traffic between the LAN and the Internet passes through this host).