User manual

ADSL Bridge/Router User's Manual
72
2. Specify a source IP address of the computer you want to
block.
3. Specify the Protocol = TCP and enable the Store State
setting.
4. Specify a destination port = 80, which is the well-known
port number for web servers.
5. Enable the rule by clicking the radio button at the top of the
page.
6. Click Submit to create the rule.
7. On the IP Filter Configuration page, set the Security Level
to the same level you chose for the rule, and set both the
Private Default Action and the Public Default Action to
Accept.
8. Click
Submit
and commit your changes.
Example 2.
Blocking Telnet accesses to the device:
1. Add a new rule for packets incoming on the ppp-0
interface.
2. Specify that the packet must contain the TCP protocol, and
must be destined for port 23, the well-known port number
used for the Telnet protocol.
3. Enable the rule by clicking the radio button at the top of the
page.
4. Click
Submit
. to create the rule, and commit your changes.
Viewing IP Filter Statistics
To view statistics on how many packets were accepted or denied
for a rule, select
Services
>
IP Filter
>
Stats
in the row
corresponding to the rule:
Managing Current IP Filter Sessions
To view all current IP sessions, select
Services
>
IP Filter
>
Session to display the IP Filters Session page: