# 1. netstat
deprecated

# 2. ss
socket statistics

```shell
ss [options] [filter]
```

## 2.1. basic
listening 소켓을 제외하고 연결중인 모든 소켓 표시
```shell
ss
```

```
Netid              State               Recv-Q              Send-Q                                                                    Local Address:Port                                                Peer Address:Port               Process
u_str              ESTAB               0                   0                                              @37ef18770354690f/bus/systemd/bus-system 9789                                                           * 10972
u_str              ESTAB               0                   0                                @855d8616477e9c56/bus/systemd-timesyn/bus-api-timesync 9317                                                           * 6091
u_str              ESTAB               0                   0                                 @248f58c9224923fa/bus/systemd-resolve/bus-api-resolve 9316                                                           * 6090
icmp6              UNCONN              0                   0                                                                              *%enp1s0:ipv6-icmp                                                      *:*
tcp                ESTAB               0                   0                                                                        192.168.200.10:microsoft-ds                                     192.168.200.100:49576
tcp                ESTAB               0                   52                                                              [::ffff:192.168.200.10]:ssh                                     [::ffff:192.168.200.100]:49173
```

## 2.2. all
모든 소켓 표시

```shell
ss -a
```

## 2.3. numeric
서비스 이름 대신 숫자로 표기

```shell
ss

...
[::ffff:192.168.200.10]:ssh
```

```shell
ss -n

...
[::ffff:192.168.200.10]:22
```

## 2.4. process
관리자 권한 필요

```shell
ss -p

Netid                State                  Recv-Q                 Send-Q                                                                          Local Address:Port                                                     Peer Address:Port        Process
tcp                  ESTAB                  0                      36                                                                    [::ffff:192.168.200.10]:ssh                                          [::ffff:192.168.200.100]:49173       users:(("sshd",pid=3277,fd=4),("sshd",pid=3160,fd=4))
```