ogogon wroteCan I configure the OpenVPN server so that the authentication of clients to work effectively, but the his traffic is not encrypted?
The manual suggests this:
The Manual wrote--cipher alg
Encrypt data channel packets with cipher algorithm alg. The default is BF-CBC, an abbreviation for Blowfish in Cipher Block Chaining mode. Blowfish has the advantages of being fast, very secure, and allowing key sizes of up to 448 bits. Blowfish is designed to be used in situations where keys are changed infrequently.
For more information on blowfish, see
http://www.counterpane.com/blowfish.html
To see other ciphers that are available with OpenVPN, use the --show-ciphers option.
OpenVPN supports the CBC, CFB, and OFB cipher modes, however CBC is recommended and CFB and OFB should be considered advanced modes.
Set alg=none to disable encryption.
This may effect other elements of your VPN ..