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WR1500 4-Port Wireless DSL/Cable Router
®
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11.5 Stateful Inspection
Stateful inspection means the WR1500 Wireless Router records packet information, such as port
number and source/destination addresses and then allows or denies the response depending on
your fi rewall rules.
The default rules allow LAN-to-WAN traffi c and deny traffi c initiated from WAN-to-LAN.
The previous fi gure shows the WR1500 Wireless Router’s default fi rewall rules in action as well
as demonstrates how stateful inspection works. User A can initiate a Telnet session from within
the LAN and responses to this request are allowed. However other Telnet traffi c initiated from the
WAN is blocked.