The Security Tab - Filter; Figure 5-21: Security Tab - Filter - Linksys WRT54GP2 User Manual

Wireless-G Broadband Router with 2 Phone Ports
Fragmentation Threshold. This value specifies the maximum size for a packet before data is fragmented into
multiple packets. If you experience a high packet error rate, you may slightly increase the Fragmentation
Threshold. Setting the Fragmentation Threshold too low may result in poor network performance. Only minor
reduction of the default value is recommended. In most cases, it should remain at its default value of 2346.
RTS Threshold. Should you encounter inconsistent data flow, only minor reduction of the default value, 2347, is
recommended. If a network packet is smaller than the preset RTS threshold size, the RTS/CTS mechanism will
not be enabled. The Router sends Request to Send (RTS) frames to a particular receiving station and negotiates
the sending of a data frame. After receiving an RTS, the wireless station responds with a Clear to Send (CTS)
frame to acknowledge the right to begin transmission. The RTS Threshold value should remain at its default value
of 2347.
When you have finished making changes on this screen, click the Save Settings button to save the changes, or
click the Cancel Changes button to undo your changes. Help information is shown on the right-hand side of a
screen. For additional information, click More.

The Security Tab - Filter

When you click the Security tab, you will see the Filter screen. Filters block specific internal users from accessing
the Internet and block anonymous Internet requests and/or multicasting.
Filter IP Address Range
You can create up to five different IP Address Range filters. To set up a filter using IP addresses, enter the range
of IP addresses you wish to filter in the Start and End 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.
Filter Port Range
You can create up to five different Port Range filters. To filter users by network port number, select the protocol
you want to filter, TCP, UDP, or Both, from the Protocol drop-down menu. Enter the port numbers you want to
filter in the Start and End fields. Users connected to the Router will no longer be able to access any port number
listed there.
Chapter 5: Configuring the Wireless-G Broadband Router with 2 Phone Ports
The Security Tab - Filter
fragmentation: breaking a packet into smaller units
when transmitting over a network medium that
cannot support the original size of the packet.

Figure 5-21: Security Tab - Filter

27