Igazad van A nem válaszól:
b$ ping 10.21.1.1
PING 10.21.1.1 (10.21.1.1) 56(84) bytes of data.
^C
--- 10.21.1.1 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3000ms
b# tcpdump -nni tun0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tun0, link-type RAW (Raw IP), capture size 262144 bytes
14:49:27.713401 IP 10.21.1.2 > 10.21.1.1: ICMP echo request, id 17787, seq 1, length 64
14:49:28.713475 IP 10.21.1.2 > 10.21.1.1: ICMP echo request, id 17787, seq 2, length 64
14:49:29.713447 IP 10.21.1.2 > 10.21.1.1: ICMP echo request, id 17787, seq 3, length 64
14:49:30.713450 IP 10.21.1.2 > 10.21.1.1: ICMP echo request, id 17787, seq 4, length 64
14:49:41.436521 IP 10.21.1.1 > 10.21.1.2: ICMP echo request, id 22601, seq 1, length 64
a# tcpdump -nni tun0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tun0, link-type RAW (Raw IP), capture size 262144 bytes