[vpn-help] Linux-Fritzbox-VPN-problem: no packet transmission although tunnel is enabled

[hp hpf]

Hi,
my configuration:

targt network :
avm Router (Fritzbox 7312)
configured according to avm online documentatiion
VPN-connections from Smartphone(Galaxy) and Windows-Host with
avm-vpn-client are running without problems

client :
OS : Linux (Fedora 16)
rp_filter set to 0 according to former bug reports
VPN-client: Shrewsoft Linux V2.2.1 configured according to
avm-onlien-description

Status after connecting:
Shrewsoft vpn-client reports "tunnel enabled"
avm-Fritzbox reports: connection bringup in progress
but no traffic will be routed, e.g. ping stalls

The problem remains the same when using the older Shrewsoft version 2.1.7

Does anybody know about this problem and possible solutions?

BR
Hans-Peter
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