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http://blog.kvv213.com/2017/03/podklyuchaemsya-k-udalennomu-routeru-zyxel-po-ipsec-vpn-cherez-strongswan-na-headless-ubuntu-14lts/
Подключаемся к удаленному роутеру ZyXEL по IPsec VPN через StrongSwan на Headless Ubuntu 14LTS