Squid has been updated to version 3.1. This update provides native IPv6 support and significantly shortens the
/etc/squid/squid.confconfiguration file. However, it also comes with some significant change to configuration options, which are not entirely backwards compatible with some older versions of Squid. For complete details on the changes, see the Squid 3.1 release notes: http://www.squid-cache.org/Versions/v3/3.1/RELEASENOTES.html.