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https://blog.it-kb.ru/2014/06/26/forward-proxy-squid-3-3-on-ubuntu-server-14-04-lts-part-5-squid-conf-settings-for-kerberos-ntlm-basic-and-access-rules/
Настройка прокси сервера Squid 3.3 на Ubuntu Server 14.04 LTS. Часть 5. Конфигурация Squid 3