How To Improve Security Using The Built-In Firewall - Cisco Linksys E900 User Manual
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7. Click Save Settings at the bottom of the page .
8. Click Wireless Client List again to check the updated device list . Only
the device you selected remains on the network .
How to improve security using the built-in firewall
Why would I need to change my security settings? By default, the firewall
settings in your router have been optimized for most home environments, so
no changes are needed . The SPI (Stateful Packet Inspection) firewall is enabled
by default . In addition, anonymous Internet requests and IDENT requests are
filtered by default . All web filters are disabled, because enabling them may
cause problems for sites that depend on ActiveX controls, Java, or cookies .
General firewall settings
To change your firewall settings:
Security->Firewall
1. Log into the browser-based utility (see "How to open the browser-based
utility" on page 25) .
2. Click the Security tab, then click the Firewall page . (Not all routers have
the options shown here .)
3. Select each setting that you want to change .
TIP
For descriptions of the filters, click Help on the right side of the
screen . More complete descriptions are included below .
SPI Firewall Protection—This helps protect your local network from
•
Internet threats . This option is enabled by default . On some router
models, this setting is separated into IPv6 and IPv4 options so that
each can be handled separately .
CAUTIon
To help protect your network, you should keep this option enabled .
Filter Anonymous Internet Requests—This filter blocks Internet
•
requests from unknown sources such as ping requests . This option is
enabled by default .
Filter Multicast—Multicasting allows a single transmission to
•
simultaneously reach specific recipients within your local network .
Select this option to block multicasting . This option is disabled by
default .
Filter Internet nAT Redirection for IPv4 Internet only—This filter
•
prevents a local computer from using a URL or Internet IP address
to access the local server . Select this option to enable the filter . This
option is disabled by default . On some router models, this setting
applies to IPv4 Internet only .
Filter IDEnT (Port 113)—This filter prevents port 113 from being
•
scanned by devices from the Internet . This option is enabled by
default .
Proxy—This filter blocks the use of Internet proxy servers . To deny
•
proxy requests, select this option . Proxy access is allowed by default .
(Not available on the E4200 .)
Java—This filter blocks Java, so you may not be able to access Java
•
content on websites . To deny Java requests, select this option . Java
content is allowed by default . (Not available on the E4200 .)
Improving Security
46
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