Does somebody has an idea, that what kind of iptables/pf rule must i use to achieve this?:
i only want to allow these connections [on the output chain]: on port 53 output only allow udp - dns on port 80 output only allow tcp - http on port 443 output only allow tcp - https on port 993 output only allow tcp - imaps on port 465 output only allow tcp - smtps on port 22 output only allow tcp - ssh on port 20-21 output only allow cp - ftp on port 989-990 output only allow tcp - ftps on port 1194 output only allow udp - OpenVPN So that e.g.: OpenVPN on port 443 would be blocked, because only HTTPS is allowed on port 443 outbound. Any ideas? :\
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