Routers Running Zone Based Firewall
By now, you should see the value of prescreening traffic on your edge router and readily agree that using your edge router as a part of your layered security strategy will bring benefits to your network. Using the edge router as a choke point is certainly useful; however, there are some limitations to its use that might be important to you. Perhaps your company is involved in government contracts, so you must have the highest possible level of security. Or perhaps you work for the government. Regardless, the next level up in security is the use of Cisco Zone Based Firewall (ZFW) on the edge router.
Cisco IOS Software Release 12.4(6)T introduced ZFW, a new configuration model for the Cisco IOS Firewall feature ...
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