armadillo:# tcpdump -i tun0 icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tun0, link-type RAW (Raw IP), snapshot length 262144 bytes

14:18:07.398224 IP 10.8.0.1 > 192.168.250.180: ICMP echo request, id 1, seq 239, length 40
14:18:07.398296 IP 192.168.250.180 > 10.8.0.1: ICMP echo reply, id 1, seq 239, length 40
14:18:08.411197 IP 10.8.0.1 > 192.168.250.180: ICMP echo request, id 1, seq 240, length 40
14:18:08.411260 IP 192.168.250.180 > 10.8.0.1: ICMP echo reply, id 1, seq 240, length 40
14:18:09.430931 IP 10.8.0.1 > 192.168.250.180: ICMP echo request, id 1, seq 241, length 40
14:18:09.430987 IP 192.168.250.180 > 10.8.0.1: ICMP echo reply, id 1, seq 241, length 40
14:18:10.435792 IP 10.8.0.1 > 192.168.250.180: ICMP echo request, id 1, seq 242, length 40
14:18:10.435847 IP 192.168.250.180 > 10.8.0.1: ICMP echo reply, id 1, seq 242, length 40
14:18:11.456163 IP 10.8.0.1 > 192.168.250.180: ICMP echo request, id 1, seq 243, length 40
14:18:11.456219 IP 192.168.250.180 > 10.8.0.1: ICMP echo reply, id 1, seq 243, length 40

10 packets captured
10 packets received by filter
0 packets dropped by kernel

armadillo:# ip route
default via 192.168.11.1 dev mlan0 src 192.168.11.3 metric 600
default dev ppp0 scope link metric 700
10.8.0.0/24 dev tun0 scope link src 10.8.0.2
192.168.11.0/24 dev mlan0 scope link src 192.168.11.3 metric 600
192.168.250.0/24 via 10.8.0.1 dev tun0
192.168.250.0/24 dev eth1 scope link src 192.168.250.180 metric 100