Cisco LINKSYS E2500V, User Manual

Page: 17 / 38

14
Advanced Dual-Band N Router
Linksys E2500
Chapter 1: Advanced Configuration
Beacon Interval
A beacon is a packet broadcast by the
Router to synchronize the wireless network . Enter a value
between 20 and 1000 milliseconds . The Beacon Interval
value indicates the frequency interval of the beacon . The
default value is
100
.
DTIM Interval
This value, between 3 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
3
.
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 .
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 .
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 This feature
makes 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 Multicasting 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 This feature is used to
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 feature to allow proxy access .