Ip Filtering - Linksys BEFSR41 User Manual

IP Filtering

IP filters block specific internal
users from accessing the
Internet and enable VPN
(Virtual Private Network) ses-
sions. You can set up filters by
using IP addresses or network
port numbers (or a range of
ports).
Setting Up Filters
• To set up a filter using IP
addresses, enter the range of
IP addresses you wish to filter
into the IP address fields.
Users who have filtered IP
addresses will not be able to
access the Internet at all. If you
only want to filter one IP
address instead of a range of
IP addresses, enter the same
value into both fields. For
instance, if you wish to filter
the PC with the IP address of 192.168.1.5, enter 5 into both fields on one line:
192.168.1.5 ~ 192.168.1.5. Click the Apply button when you're done.
• To filter users by network port number, enter a network port number or a
range of network ports. Enter the port numbers you want to filter into the port
numbers fields. Users connected to the Router will no longer be able to
access any port number listed there.
Editing MAC Filter Setting
• This feature filters the network adapter's specific MAC address from going
out to the Internet.
• To check your network adapter's MAC address, run winipcfg or ipconfig in
the command prompt, depending on which Windows operating system you
are using. To set the MAC filter, click the Edit MAC Filter Setting button.
When a second window appears, select the range in the drop-down box, and
at the MAC number prompt, enter the 12-digit MAC address you want to fil-
ter. Click the Apply button and the Continue button, before closing the win-
dow. For information on obtaining a MAC address, go to "Appendix F:
Finding the MAC Address and IP Address for Your Network Adapter."
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Instant Broadband Series
™
Figure 8-15
®
EtherFast Cable/DSL Routers
SPI (Stateful Packet Inspection)
• This feature checks the state of a packet to verify that the destination IP
address matches the source IP of the original request. To use the firewall,
click the Enable button; otherwise select Disable to use the NAT firewall.
Blocking WAN Requests
• By enabling the Block WAN Request feature, you can prevent your network
from being "pinged," or detected, by other Internet users. The Block WAN
Request feature also reinforces your network security by hiding your network
ports. Both functions of the Block WAN Request feature make it more difficult
for outside users to work their way into your network.
• Click the Apply button and then the Continue button to save your changes.
Using Multicast Pass Through
• This feature allows for multiple transmissions to specific recipients at the
same time. Select Enable to support the feature, or Disable to keep the router
from multicasting.
Using IPSec Pass Through
• This feature lets you use IPSec Pass Through. To use this feature, click the
Enable button next to IPSec Pass Through, and then the Apply button. Then
click the Continue button.
• IPSec Pass Through is enabled by default. To disable IPSec Pass Through,
click on Disable and then the Apply button. Then click the Continue button.
Using PPTP Pass Through
• Point-to-Point Tunneling Protocol is the method used to enable VPN
(Virtual Private Networking) sessions. To enable this feature, click on
Enable next to PPTP Pass Through, and click Apply. Then click the
Continue button.
• PPTP Pass Through is enabled by default. To disable this feature, click on
Disable next to PPTP Pass Through, and click the Apply button. Then click
the Continue button.
Using Remote Management
• This feature allows you to manage your Router from a remote location, via the
Internet. To enable this feature, click on Enable, and click the Apply button.
Then click the Continue button. Remote Management must be activated
before you can manage the Router from a remote location.
• To disable Remote Management, click on Disable, and click the Apply but-
ton. Then click the Continue button. If you wish to use this feature on the
browser, enter http:\\<WAN IP Address>:8080.
• To disable this feature, click on Disable, and click the Apply button. Then
click the Continue button.
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