Linux 명령어 ss (Socket Statistics)

리눅스에서 네트워크 상태를 확인하기 위해 흔히 사용하는 명령어로는 netstat 를 들수 있는데,

대체 명령어로 ss도 사용할 수 있다.

 

CentOS 6.x x64 에서 가능하니 참고!

 

#ss [옵션] [필터]

-a : 모든 포트 확인

-t : TCP 포트 확인

-u : UDP 포트 확인

-l : LISTEN 상태 포트 확인

-p : 프로세스명을 표시

-n : 호스트 / 포트 / 사용자이름을 숫자로 표시

 

[root@centos7 ~]# ss | head -n 5
Netid  State      Recv-Q Send-Q Local Address:Port      Peer Address:Port
u_str  ESTAB      0      0       * 23740                * 23739
u_str  ESTAB      0      0       * 23707                * 23706
u_str  ESTAB      0      0       * 87021                * 88383
u_str  ESTAB      0      0       * 17056                * 17112

 

[root@centos7 ~]# ss -lt
State       Recv-Q Send-Q  Local Address:Port                Peer Address:Port
LISTEN      0      2                   *:kerberos-adm        *:*
LISTEN      0      128                 *:sunrpc              *:*
LISTEN      0      5                   *:kpasswd             *:*
LISTEN      0      10       192.168.1.14:domain              *:*
LISTEN      0      10          127.0.0.1:domain              *:*
LISTEN      0      5       192.168.122.1:domain              *:*
LISTEN      0      128                 *:ssh                 *:*

 

[root@centos7 ~]# ss -pl
Netid  State      Recv-Q Send-Q Local Address:Port     Peer Address:Port
tcp    LISTEN     0      128    :::http                :::*   

 

[root@centos7 ~]# ss
Netid  State      Recv-Q Send-Q Local Address:Port    Peer Address:Port
tcp    ESTAB      0      64     192.168.1.14:ssh      192.168.1.191:57091

 

[root@centos7 ~]# ss -n
Netid  State      Recv-Q Send-Q Local Address:Port    Peer Address:Port
tcp    ESTAB      0      0      192.168.1.14:22       192.168.1.191:57091

 

[root@centos7 ~]# ss -r
Netid  State      Recv-Q Send-Q Local Address:Port         Peer Address:Port
tcp    ESTAB      0      64     centos7.example.com:ssh    192.168.1.191:57091

 

[root@centos7 ~]# ss -l4
Netid  State      Recv-Q Send-Q     Local Address:Port        Peer Address:Port
udp    UNCONN     0      0              127.0.0.1:323         *:*
udp    UNCONN     0      0          192.168.122.1:domain      *:*
udp    UNCONN     0      0               *%virbr0:bootps      *:*
udp    UNCONN     0      0                      *:bootpc      *:*
tcp    LISTEN     0      128                    *:sunrpc      *:*
tcp    LISTEN     0      5          192.168.122.1:domain      *:*
tcp    LISTEN     0      128                    *:ssh         *:*
tcp    LISTEN     0      128            127.0.0.1:ipp         *:*
tcp    LISTEN     0      100            127.0.0.1:smtp        *:*

 

[root@centos7 ~]# ss -lt
State      Recv-Q Send-Q      Local Address:Port       Peer Address:Port
LISTEN     0      128                     *:sunrpc     *:*
LISTEN     0      5           192.168.122.1:domain     *:*
LISTEN     0      128                     *:ssh        *:*
LISTEN     0      128             127.0.0.1:ipp        *:*
LISTEN     0      100             127.0.0.1:smtp       *:*
LISTEN     0      128                    :::sunrpc    :::*
LISTEN     0      128                    :::http      :::*
LISTEN     0      128                    :::ssh       :::*
LISTEN     0      128                   ::1:ipp       :::*
LISTEN     0      100                   ::1:smtp      :::*