Programm does not work with a complex route setup

[tabacha]

My /sbin/route -n output is:
Kernel-IP-Routentabelle
Ziel Router Genmask Flags Metric Ref Use Iface
192.168.4.11 0.0.0.0 255.255.255.255 UH 0 0 0 tun0
192.168.52.0 192.168.1.1 255.255.255.0 UG 0 0 0 eth0
192.168.71.0 192.168.1.2 255.255.255.0 UG 0 0 0 eth0
192.168.5.0 192.168.1.2 255.255.255.0 UG 0 0 0 eth0
192.168.4.0 192.168.4.11 255.255.255.0 UG 0 0 0 tun0
192.168.51.0 192.168.1.1 255.255.255.0 UG 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.73.0 192.168.1.2 255.255.255.0 UG 0 0 0 eth0
192.168.72.0 192.168.1.2 255.255.255.0 UG 0 0 0 eth0
172.16.0.0 192.168.4.11 255.255.0.0 UG 0 0 0 tun0
239.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth1
0.0.0.0 192.168.1.10 0.0.0.0 UG 0 0 0 eth0