refowarding the radius request when authentication fails

[laurent.feron at free.fr]

Hello,

in the authentication step, i try several authentication against otp server, but if all are failed if the user is not know, i would like to re forward the radius request to another radius server.

except the suffix mechanism in authorize section that i know a little bit, i don't see how to do that easily in the authentication section.
The only solution i see, but not very nice, is to build a radius client in perl (define in the authentication function (rlm_perl)).
If someone has an idea ???

Regards,
Laurent