CRADLEPOINT
CBR400| USER MANUAL Firmware ver. 3.3.0
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PAGE 62
6.4.2
IP Filter Rules
An "Incoming" IP filter rule restricts remote access to
computers on your local network. "Outgoing" filter rules
prevent computers on your local network from initiating
communication to the address range specified in the rule.
This feature is especially useful when combined with port
forwarding and/or DMZ to restrict remote access to a
specified host or network range. For example, in order to host a server you might have opened ports with a port
forwarding rule that could expose your LAN to cyber attacks. With an incoming IP filter rule, you can restrict the access to
your LAN to only known devices.
Name:
Name your rule.
Direction:
―Incoming‖ or ―Outgoing‖
Action:
―Allow‖ or ―Deny‖
Start Port:
Use for a single port or a range of ports.
End Port:
Use for a single port or a range of ports.
Network Address
Subnet Mask
Use
Start Port
,
End Port
,
Network Address
, and
Subnet Mask
to
specify the ports and addresses for which the rule applies. You can
specify a range of ports or a single port (by inputting the same value in
both port fields). Similarly, the subnet mask can be used to define
either a range of addresses (i.e. 255.255.255.0) or a single address
(255.255.255.255).
Example of an IP Filter Rule:
Suppose you have opened a port in your firewall in
order to run a server. Someone, Johnny, is abusing that opening, so you would like to
restrict his access. Create a rule that will deny Johnny
‘s IP address.
Name:
No more Johnny
Direction:
Incoming
Action:
Deny
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