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Routing between ppp0 <-> eth0


we want to use the devboard_lx as routing device between an incoming PPP
connection and outgoing ethernet connection.

How can we enable that routing path. At the moment we can make a ping to
the dev_board over PPP but eth0 devices are not reachable.

notebook <--ppp->Dev_board //ping OK
Dev_board <--eth0--> WEB //ping OK

Notebook<--ppp-->Dev_board<-->eth0<-->WEB //ping not ok  

At standard Linux we can enable routing by editing
/proc/sys/net/ipv4/ip_forward to 1. On the dev_board that file is not