Do the name resolution for the website and write a policy to block the traffic from your trusted network to that website ip address. If required i shall write the policy and give it to you, for this i need the following details.
1. Name of the websites
2. Local network range (LAN ip address with SNM)
But this is very hard for you if there is more number of websites, For this you shall integrate a URL filtering software like WebSense, N2H2 etc with your firewall.
SOURCE: asa 5505
take this site address u will get all the commands of firewall
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/asa80cfg.pdf
SOURCE: how will block yahoo.com using cisco asa 5505
Hello there, you need to check this out
Regards
SOURCE: Cisco ASA 5505 Firmware
Yes, it is possible and Yes you have to purchase it from Cisco.
Sorry, that is how they make the big bucks.
Consider a service contract on the unit, then you can download the firmware much cheaper.
SOURCE: block websites on cisco asa 5510.
All websites or specific ones?
If you want to block all web traffic, a straightforward rule preventing HTTP traffic (TCP port 80) as well as HTTPS (port 443) will block any and all web access.
If you just want to block specific sites, I'd recommend an access control list (ACL) configured to deny traffic to those specific site's IP addresses.
SOURCE: how to internet site block in asa 5505 cisco
This should tell you everything you need to know -
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080940e04.shtml
Hope I helped
Dr Reed
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