We assume here that you can only get connected to internet through a serial modem connection and that you want to share that connection with other (internal) computers in your home or office. What follows describe the configuration of this dial-up modem router. Your external interface (to the internet) will be ppp0, your internal interface (to your internal network) is supposed to be done through an ethernet network card (eth0).

The PPP-Howto is a useful reference for this section.

Comments on this section should be addressed to its maintainer: Eric Spakman <espakman at users.sourceforge.net>. Thanks to Lee who provided useful additions to this section.

Bering-uClibc comes with two ppp daemons, one with filter support and one without. The ppp.lrp package on the base image contains the ppp daemon without filter support. The ppp-filter.lrp package can be used for demand-dialing mode and needs the libpcap.lrp package. Before using the filter version, the package needs to be renamed to ppp.lrp.

The ppp source is version 2.4.2 and supports ipv6, mschapv2, mppe and optional pppoe or pppoatm with plugins