System Administration Guide, Volume 3

auth_algs

This option enables IPsec AH for a tunnel, with the authentication algorithm specified. It has the following format:


auth_algs authentication_algorithm

The algorithm can be either a number or an algorithm name, including the parameter any, to express no specific algorithm preference. You must specify all IPsec tunnel properties on the same command line. To disable tunnel security, specify the following option:


auth_alg none