ippd uses the same files for authentification as pppd for modem-connections: /etc/ppp/pap-secrets /etc/ppp/chap-secrets (ppp-Howto, /usr/share/doc/ppp/FAQ.gz) for pap-authentification is it: username * very_secret for chap-authentification: client (username) server (providername) very_secret [ip-address] Very well explained in german: Peter H. Ganten: Debian GNU/Linux, S. 527 ff, isbn 3-540-65841-6 regards, mfg bernward