I am experimenting with openvpn and I try to understand how the mtu is calculated. If I set `--link-mtu 1460`, then the tun0 mtu I see with `ip a` is 1408. I understand that the IP + UDP headers are 28 bytes. What are the other 24 bytes openvpn substracts? I thought it would have sth to do with encryption, so I disabled encryption (using `--cipher none`), but the same happened.
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