1、文档链接

• centos7 firewall-cmd 用活firewalld防火墙中的zone：
• Linux 双网卡绑定
• Linux中高级网络配置（链路聚合BOND&TEAM、桥接）(网络冗余)
• DNS：从零搭建公司内网DNS服务器

2、知识点：

1、查看可使用的端口：

sysctl net.ipv4.ip_local_port_rangecat

2、查看mac地址配置文件

cat /etc/sysconfig/network-scripts/ifcfg-eth0

3、ip地址配置文件

/etc/udev/rules.d/70-persistent-net.rules

4、查看网卡的状态

[root@centos ~]# ethtool ens32
Settings for ens32:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Link detected：yes表示有网线插入
如果Link detected:no 的话，尝试用命令ifconfig eth2 up，如果用ethtool查看任然为no的话，才能说明此网卡确实没有网线插入。