Cisco Systems WRVS4400NRF manual Setting Up and Configuring the WRVS4400N Wireless-N Router

Setting Up and Configuring the WRVS4400N Wireless-N Router	5
Setting Up Your Wireless-N Router

-Block following sites—Prevent a limited set of 6to4 gateways from establishing tunnels with the router. Up to 20 sites can be configured.

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Cisco WRVS4400N Wireless-N Gigabit Security Router with VPN Administration Guide 66