1: netstate [deprecated]
netstat role:
| demand | Original instruction | New command |
|---|---|---|
| 1: Network connection | netstat -a | ss |
| 2: Routing Table | netstat -r | ip route |
| 3: Statistical Interface | netstat -v | ip -s link |
| 4: Pseudo connection | netstat -M | ss |
| 5: multicast member | netstat -g | ip maddr |
2: ss: Socket Statistics: get socket statistics
1：查询ss是否安装
[root@localhost ~]# rpm -qf /usr/sbin/ss
iproute-3.10.0-13.el7.x86_64
[root@localhost ~]# rpm -q iproute
iproute-3.10.0-13.el7.x86_64
2：查看当前服务器的网络连接统计
[root@localhost ~]# ss -s
Total: 434 (kernel 459)
TCP: 6 (estab 2, closed 0, orphaned 0, synrecv 0, timewait 0/0), ports 0
Transport Total IP IPv6
* 459 - -
RAW 1 0 1
UDP 2 2 0
TCP 6 4 2
INET 9 6 3
FRAG 0 0 0
3：查看所有打开的网络端口
[root@localhost ~]# ss -l
[root@localhost ~]# ss -pl | grep sshd ### -p列出具体的程序名称
tcp LISTEN 0 128 *:ssh *:* users:(("sshd",1618,3))
tcp LISTEN 0 128 :::ssh :::* users:(("sshd",1618,4))
### 1618为pid
4：查看这台服务器的所有socket连接
[root@localhost ~]# ss -a
[root@localhost ~]# ss -ta|ua|wa|xa ### TCP/UDP/RAW/UNIX sockets3: net-tools and Comparative iproute2
| effect | net-tools usage | iproute2 usage |
|---|---|---|
| Native to show all network interfaces | ifconfig | ip link show |
| 2: to open a network interface | ifconfig eth0 up | ip link set up eth0 |
| 3: Stop a network interface | ifconfig eth0 down | ip link set down eth0 |
| 4: Set the network address of the network interface Ip | ifconfig eth0 10.0.0.1/24 | ip addr add 10.0.0.1/24 dev eth0 |
| 5: Remove the network Ip address | ifconfig eth0 0 | ip addr del 10.0.0.1/24 dev eth0 |
| 6: Shows the IP address of a network interface | ifconfig eth0 | ip addr show dev eth0 |
| 7: Displays the routing table | route -n | ip route show |
| 8: Adding the default gateway | route add default gw 192.168.1.2 eth0 | ip route add default via 192.168.1.2 eth0 |
| 9: Delete the default gateway | route del default gw 192.168.1.2 eth0 | ip route del default via 192.168.1.2 eth0 |
| 10: show arp table | arp -an | ip neigh |
| 11: Add ARP entries | arp -s 192.168.1.100 00 :0c：29：c0：5d：ef |
ip neigh add 192.168.1.100 lladdr 00 :0c：29：c0：5d：ef |
| 12: delete arp entries | arp -d 192.168.1.100 | ip neigh del 192.168.1.100 dev eth0 |
| 13: View of multicast information | ipmaddr show dev eth0 | ip maddr list dev eth0 ### Note format |
| 14: state display socket | netstat -l | ss -l |
Check the man page for details
[root@localhost ~]# man ip route