RHEL7网络管理

ping检查网络连通性

ping 常常用来测试与目的主机的连通性。

可以ping通

[root@chao ~]# ping 172.16.1.254
PING 172.16.1.254 (172.16.1.254) 56(84) bytes of data.
64 bytes from 172.16.1.254: icmp_seq=1 ttl=128 time=0.529 ms
64 bytes from 172.16.1.254: icmp_seq=2 ttl=128 time=0.297 ms
64 bytes from 172.16.1.254: icmp_seq=3 ttl=128 time=0.135 ms
64 bytes from 172.16.1.254: icmp_seq=4 ttl=128 time=0.245 ms
64 bytes from 172.16.1.254: icmp_seq=5 ttl=128 time=0.214 ms
^C
--- 172.16.1.254 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4001ms
rtt min/avg/max/mdev = 0.135/0.284/0.529/0.133 ms
[root@chao ~]# 

不可以ping通

[root@chao ~]# ping 172.16.1.250
PING 172.16.1.250 (172.16.1.250) 56(84) bytes of data.
From 172.16.1.16 icmp_seq=1 Destination Host Unreachable
From 172.16.1.16 icmp_seq=2 Destination Host Unreachable
From 172.16.1.16 icmp_seq=3 Destination Host Unreachable
From 172.16.1.16 icmp_seq=4 Destination Host Unreachable
From 172.16.1.16 icmp_seq=5 Destination Host Unreachable
From 172.16.1.16 icmp_seq=6 Destination Host Unreachable
From 172.16.1.16 icmp_seq=7 Destination Host Unreachable
From 172.16.1.16 icmp_seq=8 Destination Host Unreachable
^C
--- 172.16.1.250 ping statistics ---
9 packets transmitted, 0 received, +8 errors, 100% packet loss, time 8003ms
pipe 4

配置网络

设置ip

[root@chao ~]# ifconfig ens33:1 172.16.1.114 netmask 255.255.255.0 up

更改mac地址

[root@chao ~]# ifconfig ens33:1 hw ether 00:0c:29:0b:07:77

修改路由表

显示路由表

[root@chao ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.1.254    0.0.0.0         UG    100    0        0 ens33
172.16.1.0      0.0.0.0         255.255.255.0   U     100    0        0 ens33
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0

添加路由

[root@chao ~]# route add -net 172.16.2.0 netmask 255.255.255.0 gw 172.16.1.254

删除路由

[root@chao ~]# route del -net 172.16.2.0 netmask 255.255.255.0 

查看网络状态

查看所有端口

[root@chao ~]# netstat -a|head -4
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:sunrpc          0.0.0.0:*               LISTEN     
tcp        0      0 chao:domain             0.0.0.0:*               LISTEN     

查看tcp端口

[root@chao ~]# netstat -at
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 0.0.0.0:sunrpc          0.0.0.0:*               LISTEN     
tcp        0      0 chao:domain             0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN     
tcp        0      0 localhos:x11-ssh-offset 0.0.0.0:*               LISTEN     
tcp        0     36 chao:ssh                172.16.1.100:57418      ESTABLISHED
tcp6       0      0 [::]:sunrpc             [::]:*                  LISTEN     
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN     
tcp6       0      0 localhos:x11-ssh-offset [::]:*                  LISTEN

查看udp端口

[root@chao ~]# netstat -au
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
udp        0      0 chao:domain             0.0.0.0:*                          
udp        0      0 0.0.0.0:bootps          0.0.0.0:*                          
udp        0      0 localhost:323           0.0.0.0:*                          
udp6       0      0 localhost:323           [::]:*             

traceroute查看路由信息

[root@chao ~]# traceroute to www.baidu.com (103.235.46.39), 30 hops max, 60 byte packets
 1  gateway (172.16.1.254)  0.132 ms  0.062 ms  0.086 ms
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  * * *
 9  * * *
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *

telnet测试远程端口

[root@chao ~]# telnet 172.16.1.16 80

wget下载网络文件

[root@chao ~]# wget https://mirror.bit.edu.cn/Apache/httpd/httpd-2.4.43.tar.gz

https://www.linuxprobe.com/rhel-network-mgmt.html