A quirk from OpenVPN 2.4 is that the peer-info value IV_NCP=2 signals the client supports (and wants to use) AES-128-GCM and AES-256-GCM. Newer openvpn servers (>= 2.5) will look after IV_NCP=2 if IV_CIPHERS is not present.
The IV_NCP=2 value could be removed if we do not desire to support OpenVPN 2.4 (and other implementations with the same quirk).
A quirk from OpenVPN 2.4 is that the peer-info value IV_NCP=2 signals the client supports (and wants to use) AES-128-GCM and AES-256-GCM. Newer openvpn servers (>= 2.5) will look after IV_NCP=2 if IV_CIPHERS is not present.
The IV_NCP=2 value could be removed if we do not desire to support OpenVPN 2.4 (and other implementations with the same quirk).
Addresses #152.