Blocking Skype via Squid 3.0

In order to block the Skype by using Squid 3.0, here is guide from squid web site.

# Skype

acl numeric_IPs dstdom_regex ^(([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)|(\[([0-9af]+)?:([0-9af:]+)?:([0-9af]+)?\])):443
acl Skype_UA browser ^skype^

http_access deny numeric_IPS
http_access deny Skype_UA

• Recent releases of Skype have been evading the above restriction by not sending their User-Agent headers and using domain names. The following can be used to catch those installs, but be aware it will likely also catch other agents.

acl validUserAgent browser \S+
http_access deny !validUserAgent