This a good VPN source
源代码在线查看: icmp-output.txt
IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter IP 192.0.1.254 > 192.0.1.2: icmp 212: host 192.0.2.1 unreachable - admin prohibited filter