Port: 53
tcpdump -i eth0 -l -n -v -Q in dst port 53
tcpdump -i ens3 -l -n -v -Q in dst port 53
Port: 443
tcpdump -i ens3 -nn -s0 -v -Q in dst port 443
tcpdump -i eth0 -nn -s0 -v -Q in dst port 443
Port: 853
tcpdump -i ens3 -nn -s0 -v -Q in dst port 853
tcpdump -i eth0 -nn -s0 -v -Q in dst port 853
Port: 8443
tcpdump -i ens3 -nn -s0 -v port 8443
tcpdump -i eth0 -nn -s0 -v port 8443// ss cmd
watch -n 1 "ss -t4 state established"
ss -s && free -g
// ping over tcp via hping3
apt install hping3
hping3 -S -p 443 1.1.1.1
//netcat nc port scan
nc -z -v jp1.ookangzheng.com 1-1000
nc -u -z -v jp1.ookangzheng.com 1-1000 (UDP)
netstat -a|grep 853
netstat -a|grep 443 | grep ESTABLISHED
//
// Port 8443
netstat -an udp | grep :8443 | sort
//
// USE THIS
tcpdump -i wg0 -nn -s0 -v -Q in dst port 53
tcpdump -i ens3 -nn -s0 -v -X -s1500 -Q in dst port 53
tcpdump -i ens3 -nn -s0 -v -Q in dst port 443
tcpick -i ens3 -C "port 853"
tcpdump -vv -x -X -s1500 -i ens3 'port 53'
tcpdump -l -n -i ens3 dst port 8443 and inbound (inbound port 8443)
or
tcpdump -l -n -i ens3 dst port 8443 -Q in ('in',out' and `inout')
//tcp dump
tcpdump -i ens3 -n udp port 8443 (UDP port 8443)
tcpdump -i ens3 -n udp port 8443 -X (With header)
tcpdump -i ens3 -nn -s0 -v port 8443
tcpdump -i eth0 -nn -s0 -v port 8443
// List port 53 udp, tcp, dnscrypt connection
netstat -n 2>/dev/null | grep :53
netstat -n 2>/dev/null | grep :8443
// Grep port 443 with establised tag
$ netstat -anp | grep :443 | grep ESTABLISHED | wc -l
// Grep port 443
$ netstat -anp |grep 443 |wc -l
// with TCP
// netstat -t
//awk no 5 feild
$ netstat -tn 2>/dev/null | grep :53 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
$ netstat -tn 2>/dev/null | grep :8443 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
$ netstat -tn 2>/dev/null | grep :853 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
$ netstat -tn 2>/dev/null | grep :443 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head
// with UDP, TCP
netstat -n 2>/dev/null | grep :443 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | headSources