课程第31次
检查网络配置：<font size="2">netstat -antp</font>Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd
tcp 0 0 0.0.0.0:6000 0.0.0.0:* LISTEN 18199/X
tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 18296/dnsmasq
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 7889/sshd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 18143/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 8187/master
tcp 0 208 192.168.0.4:22 192.168.0.165:56697 ESTABLISHED 19914/sshd: root@pt
tcp6 0 0 :::111 :::* LISTEN 1/systemd
tcp6 0 0 :::6000 :::* LISTEN 18199/X
tcp6 0 0 :::22 :::* LISTEN 7889/sshd
tcp6 0 0 ::1:631 :::* LISTEN 18143/cupsd
tcp6 0 0 ::1:25 :::* LISTEN 8187/master
静态固定配网络：
网络的配置文件：
1. 接口设备/etc/sysconfig/network-scripts/ifcfg-xxx
xxx 是由模块（lsmod : e100; rmmod e1000;modprobe e1000）
DEVICE=xxx
IPADDR=10.10.10.10
NETMASK=255.255.255.0
GATEWAY=10.10.10.12. 名字服务器的客户端：
/etc/resolv.conf:
search example.com
nameserver 192.168.0.1
nameserver 8.8.8.83. 自己的主机名：
/etc/hostname:
station4.example.comRHEL6含之前：
/etc/sysconfig/network:
HOSTNAME=station4.example.com4. 其他机器的主机名（没有DNS的时候认识其他主机使用，有DNS时，优先级也高于DNS）
/etc/hosts:
127.0.0.1localhost.localdomainlocahost
10.10.10.4 station4.example.comstation4
...............动态适应配网络：
NetworkManager/nmcli/nm-connection-editor
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一个物理网卡，同时有多个IP地址：
# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>mtu 1500
inet 192.168.0.4netmask 255.255.255.0broadcast 192.168.0.255
inet6 fe80::20c:29ff:fe8c:a433prefixlen 64scopeid 0x20<link>
ether 00:0c:29:8c:a4:33txqueuelen 1000(Ethernet)
RX packets 5915bytes 741821 (724.4 KiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 1857bytes 385845 (376.8 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>mtu 1500
inet 192.168.0.104netmask 255.255.255.0broadcast 192.168.0.255
ether 00:0c:29:8c:a4:33txqueuelen 1000(Ethernet)
lo: flags=73<UP,LOOPBACK,RUNNING>mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10<host>
looptxqueuelen 1000(Local Loopback)
RX packets 2359bytes 156920 (153.2 KiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 2359bytes 156920 (153.2 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
# pwd
/etc/sysconfig/network-scripts
# ls
ifcfg-ens33 ifdown-isdn ifup-bnep ifup-routes
ifcfg-ens33:0 ifdown-post ifup-eth ifup-sit
ifcfg-ens33.bakifdown-ppp ifup-ib ifup-Team
ifcfg-lo ifdown-routes ifup-ippp ifup-TeamPort
ifdown ifdown-sit ifup-ipv6 ifup-tunnel
ifdown-bnep ifdown-Team ifup-isdn ifup-wireless
ifdown-eth ifdown-TeamPortifup-plip init.ipv6-global
ifdown-ib ifdown-tunnel ifup-plusbnetwork-functions
ifdown-ippp ifup ifup-post network-functions-ipv6
ifdown-ipv6 ifup-aliases ifup-ppp
# cat ifcfg-ens33
DEVICE=ens33
IPADDR=192.168.0.4
NETMASK=255.255.255.0
# cat ifcfg-ens33
DEVICE=ens33
IPADDR=192.168.0.4
NETMASK=255.255.255.0
#
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