Cisco WRVS4400N - Small Business Wireless-N Gigabit Security Router Administration Manual page 66

Setting Up and Configuring the WRVS4400N Wireless-N Router
Setting Up Your Wireless-N Router
Cisco WRVS4400N Wireless-N Gigabit Security Router with VPN Administration Guide
- 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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