Firewall Security

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I have a Cisco 3825 router with Cisco IOS Software, 3800 Software (C3825-ADVENTERPRISEK9-M), Version 15.1(4)M8,
RELEASE SOFTWARE (fc2)

I am running a few servers: Database Server, 2 web servers, mail server, DNS Server. All boxes have windows server 2008 R2 installed and I am using the built in windows firewall.

I am concerned about security. Does this 3800 software shown above provide Firewall capabilities and should that also be used even though I am using the Windows firewal on each box?

OR

Should an ASA55010 or something be used instead of the routers firewall features?

Any help would be appreciated.

[Marvin Rhoads]

The IOS zone-based firewall could be used on your router.

It canbe challenging to setup from scratch but if you use the Cisco Configuration Professional (CCP) GUI, it's not too dificult.

There are some good links on this page:

http://www.cisco.com/c/en/us/products/security/ios-firewall/index.html