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2. Is it possible to modify the rule to be more specific? For example, if IRC is blocked for all
users, will a rule that blocks just certain users be more effective?
3. Does a rule that allows Internet users access to resources on the LAN create a security
vulnerability? For example, if FTP ports (TCP 20, 21) are allowed from the Internet to the
LAN, Internet users may be able to connect to computers with running FTP servers.
4. Does this rule conflict with any existing rules?
Once these questions have been answered, adding rules is simply a matter of plugging the
information into the correct fields in the WebGUI screens.
10.3.3
Key Fields For Configuring Rules
Action
Should the action be to Block or Forward?
"Block" means the firewall silently discards the packet.
Service
Select the service from the Service scrolling list box. If the service is not listed, it is necessary to
first define it. See section 10.7 for more information on predefined services.
Source Address
What is the connection's source address; is it on the LAN or WAN? Is it a single IP, a range of IPs
or a subnet?
Destination Address
What is the connection's destination address; is it on the LAN or WAN? Is it a single IP, a range of
IPs or a subnet?
Connection Direction Examples
10.4
This section describes examples for firewall rules for connections going from LAN to WAN and
from WAN to LAN.
LAN to LAN/Contivity 221, WAN and WAN/Contivity 221 rules apply to packets coming in on
the associated interface (LAN or WAN respectively). LAN to LAN/Contivity 221 means policies
for LAN-to-Contivity 221 (the policies for managing the Contivity 221 through the LAN interface)
and policies for LAN-to-LAN (the policies that control routing between two subnets on the LAN).
Similarly, WAN to WAN/Contivity 221 polices apply in the same way to the WAN ports.
Firewall Screens 10-3
Contivity 221 VPN Switch User's Guide
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