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ACL

tarun_cisco
Beginner
Beginner

Hi,

By any chance can I block tcp web session using standard access list at all or only extended is option?

Sent from Cisco Technical Support iPhone App

7 Replies 7

cadet alain
Mentor
Mentor

Hi,

You want to block all http or some urls?

Regards.

Alain.

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tarun_cisco
Beginner
Beginner

Hi,

Want to block whole http please.

Sent from Cisco Technical Support iPhone App

tarun_cisco
Beginner
Beginner

Hi,

Want to block whole http please.

Sent from Cisco Technical Support iPhone App

tarun_cisco
Beginner
Beginner

Hi,

Want to block whole http please.

Sent from Cisco Technical Support iPhone App

tarun_cisco
Beginner
Beginner

Hi,

Want to block whole http please.

Sent from Cisco Technical Support iPhone App

Hi,

you can add this to your acl and this will block tcp traffic on port 80, for https use port 443. Remember there is an explicit deny at the end of the access list.

e.g. access-list 101 deny tcp any any eq 80

Regards,

Alex

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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Posting

Yes, its possible with a standard ACL although its not very granular.  I.e., you're likely block other traffic too, e.g. all traffic from an address block.

An extended ACL will allow a much more specific ACE such as bocking TCP port 80.

However, even an extended ACL might not be specific enough.  You might need something like NBAR and/or FPM to truly block a specific web session, since these technologies can identify HTTP traffic using other than port 80 and/or URL contents.

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