Check the LISTEN port of TCP
$ sudo netstat -plnt Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 1199/mysqld tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN 953/smbd tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 1191/dovecot tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1191/dovecot tcp 0 0 127.0.0.1:80 0.0.0.0:* LISTEN 18249/nginx tcp 0 0 10.1.192.180:22 0.0.0.0:* LISTEN 32423/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2140/master tcp 0 0 10.1.192.180:443 0.0.0.0:* LISTEN 18249/nginx tcp 0 0 0.0.0.0:445 0.0.0.0:* LISTEN 953/smbd tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 1191/dovecot tcp 0 0 10.1.192.180:5666 0.0.0.0:* LISTEN 22129/nrpe tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 1191/dovecot tcp6 0 0 :::139 :::* LISTEN 953/smbd tcp6 0 0 :::110 :::* LISTEN 1191/dovecot tcp6 0 0 :::143 :::* LISTEN 1191/dovecot tcp6 0 0 ::1:25 :::* LISTEN 2140/master tcp6 0 0 :::445 :::* LISTEN 953/smbd tcp6 0 0 :::993 :::* LISTEN 1191/dovecot tcp6 0 0 :::995 :::* LISTEN 1191/dovecot
看所有現在的 connection
$ netstat -n -a | grep 8080 tcp 0 0 10.42.92.34:8080 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:58080 0.0.0.0:* LISTEN tcp 0 0 10.42.92.34:8080 10.42.92.8:51923 ESTABLISHED tcp 0 0 10.42.92.34:8080 10.42.92.8:1896 ESTABLISHED tcp 0 0 10.42.92.34:8080 10.42.92.8:63793 ESTABLISHED tcp 0 0 10.42.92.34:8080 10.42.92.8:30276 ESTABLISHED tcp 0 0 10.42.92.34:8080 10.42.92.8:47118 TIME_WAIT tcp 0 0 10.42.92.34:8080 10.42.92.8:29695 TIME_WAIT tcp 0 0 10.42.92.34:8080 10.42.92.8:4093 TIME_WAIT tcp 0 0 10.42.92.34:8080 10.42.92.8:37087 TIME_WAIT tcp 0 0 10.42.92.34:8080 10.42.92.201:50008 TIME_WAIT
查 host name
$ host <ip> $ nslookup <ip> $ dig -x <ip> $ arp -a | grep <ip>
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