Security > Firewall - Cisco Linksys E1000 User Manual

Linksys E1000
CTS Protection Mode
uses CTS (Clear-To-Send) Protection Mode when your
Wireless-N and Wireless-G devices are experiencing severe
problems and are not able to transmit to the Router in an
environment with heavy 802 .11b traffic . This option boosts
the Router's ability to catch all Wireless-N and Wireless-G
transmissions but severely decreases performance . To use
this option, keep the default, Auto . To disable this option,
select Disabled .
Beacon Interval A beacon is a packet broadcast by the
Router to synchronize the wireless network . The Beacon
Interval value indicates the frequency interval of the
beacon . Enter a value between 20 and 65,535 milliseconds .
The default value is 100 .
DTIM Interval
This value, between 1 and 255, indicates
the interval of the Delivery Traffic Indication Message
(DTIM) . A DTIM field is a countdown field informing
clients of the next window for listening to broadcast
and multicast messages . When the Router has buffered
broadcast or multicast messages for associated clients, it
sends the next DTIM with a DTIM Interval value . Its clients
hear the beacons and awaken to receive the broadcast
and multicast messages . The default value is 1 .
Fragmentation Threshold
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 Request to Send (RTS) threshold size, the RTS/CTS
(Clear to Send) mechanism will not be enabled . The Router
sends 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 CTS frame
to acknowledge the right to begin transmission . The RTS
Threshold value should remain at its default value of 2347
Click Save Settings to apply your changes, or click Cancel
Changes to clear your changes .
Security > Firewall
The Firewall screen is used to configure a firewall that can
filter out various types of unwanted traffic on the Router's
local network .
Wireless-N Router
The Router automatically
This value specifies the
Chapter 2: Advanced Configuration
Security > Firewall
Firewall
SPI Firewall Protection
To use firewall protection,
keep the default selection, Enabled . To turn off firewall
protection, select Disabled .
Internet Filters
Filter Anonymous Internet Requests
it more difficult for outside users to work their way into
your network . This option is enabled by default . Disable it
to allow anonymous Internet requests .
Filter Multicast The multicasting feature allows for
multiple transmissions to specific recipients at the
same time . If multicasting is permitted, then the Router
will allow IP multicast packets to be forwarded to the
appropriate computers . Select this option to enable the
filter . This option is disabled by default .
Filter Internet NAT Redirection
prevent a local computer from using a URL or Internet
address to access the local server . Select this option to
enable the filter . This option is disabled by default .
Filter IDENT (Port 113) The Filter IDENT (Identification)
option keeps port 113 from being scanned by devices
outside of your local network . This option is enabled by
default . Disable it to allow port 113 to be scanned .
Web Filters
Proxy
Use of WAN proxy servers may compromise the
Gateway's security . Denying Proxy will disable access to
any WAN proxy servers . Select this option to enable proxy
filtering . Deselect the option to allow proxy access .
Java Java is a programming language for websites . If you
deny Java, you run the risk of not having access to Internet
sites created using this programming language . Select
this option to enable Java filtering . Deselect the option to
allow Java usage .
ActiveX
ActiveX is a programming language for websites .
If you deny ActiveX, you run the risk of not having access to
Internet sites created using this programming language .
This option makes
This option is used to
17