tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
17:10:11.921568 IP PROXYSERVER_IP.43542 > CLIENT_IP.4141: UDP, length 11 // netcat
17:10:33.071689 IP CLIENT_IP.62036 > PROXYSERVER_IP.4141: UDP, length 3 // auth 0x05 0x01 0x00
17:10:33.071709 IP PROXYSERVER_IP > CLIENT_IP: ICMP PROXYSERVER_IP udp port 4141 unreachable, length 39 // response?