How can I use Net::SSH2 or Net::SSH::Perl in krb5 authen env?

[chenlin rao]

Hello all:
    I usually like to use Net::SSH2 or Net::SSH::Perl module to send
commands to the cluster. But now, these servers change to be authenticated
by kerberos5.When I kinit and try my old scripts, it failed!
    $ssh2->auth_list return "gssapi-keyex" and "gssapi-micpasswd", but
nothing related in PODs of Net::SSH2/Net::SSH::Perl.
    Thanks for help~~