Richard Boekamp wrote:

> Does anybody have a clue in which direction I should search?

cat /proc/sys/net/ipv4/ip_forward

If it contains a 0 try:

echo 1 > /proc/sys/net/ipv4/ip_forward

Also the router must be able to find the modem user, so maybe you'll
need to use the proxy arp pppd option as well...

Or just add a static arp entry on the server using:

arp -s 10.0.0.190 mac_address_of_server

X.