Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships
# netstat -h
-r, --route display routing table
-i, --interfaces display interface table
-s, --statistics display networking statistics (like SNMP)
-p, --programs display PID/Program name for sockets
-n, --numeric don't resolve names
-a, --all display all sockets (default: connected)
#man netstat
netstat {--help|-h}
OPTIONS
--route , -r
Display the kernel routing tables. See the description in route(8) for details.
netstat -r and route -e produce the same output.
--interfaces=iface , -I=iface , -i
Display a table of all network interfaces, or the specified iface.
--statistics , -s
Display summary statistics for each protocol.
OPTIONS
--numeric , -n
Show numerical addresses instead of trying to determine symbolic host, port or user names.
-p, --program
Show the PID and name of the program to which each socket belongs.
-a, --all
Show both listening and non-listening (for TCP this means established connections) sockets.
With the --interfaces option, show inter‐faces that are not up
# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 enp0s3 172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s3 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 br-295e2a4e2c26
# netstat -anp Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:199 0.0.0.0:* LISTEN 949/snmpd tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 942/php-fpm: master tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1328/mysqld tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 970/nginx: master p tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 970/nginx: master p tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 945/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1425/master tcp 0 0 0.0.0.0:10050 0.0.0.0:* LISTEN 966/zabbix_agentd tcp 0 0 0.0.0.0:10051 0.0.0.0:* LISTEN 1008/zabbix_server tcp 0 96 192.168.0.22:22 192.168.0.9:62742 ESTABLISHED 1594/sshd: root@pts tcp6 0 0 :::22 :::* LISTEN 945/sshd tcp6 0 0 ::1:25 :::* LISTEN 1425/master tcp6 0 0 :::10050 :::* LISTEN 966/zabbix_agentd tcp6 0 0 :::10051 :::* LISTEN 1008/zabbix_server udp 0 0 0.0.0.0:11728 0.0.0.0:* 744/dhclient udp 0 0 0.0.0.0:68 0.0.0.0:* 744/dhclient udp 0 0 0.0.0.0:161 0.0.0.0:* 949/snmpd udp 0 0 192.168.0.22:59110 13.230.38.136:123 ESTABLISHED 672/chronyd udp 0 0 127.0.0.1:323 0.0.0.0:* 672/chronyd udp6 0 0 :::4433 :::* 744/dhclient udp6 0 0 ::1:323 :::* 672/chronyd raw6 0 0 :::58 :::* 7 675/NetworkManager
# netstat -i Kernel Interface table Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg br-295e2 1500 1273 0 0 0 703 0 0 0 BMU docker0 1500 0 0 0 0 0 0 0 0 BMU enp0s3 1500 1273 0 0 0 703 0 0 0 BMRU lo 65536 3202 0 0 0 3202 0 0 0 LRU
# netstat -s
Ip:
4461 total packets received
0 forwarded
0 incoming packets discarded
4456 incoming packets delivered
3893 requests sent out
4 dropped because of missing route
Icmp:
0 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
4 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 4
IcmpMsg:
OutType3: 4
Tcp:
322 active connections openings
324 passive connection openings
1 failed connection attempts
0 connection resets received
1 connections established
4410 segments received
3872 segments send out
0 segments retransmited
0 bad segments received.
9 resets sent
(abbr)