网络配置多会话实验

• nmcli配置多会话
• 绑定两块网卡

---

• 实验1
  网卡支持多会话功能，由于工作环境不同，需要配置不同的网络：如在家里使用使用DHCP获取，在公司使用固定ip，如果使用修改方式比较麻烦，配置多会话功能，在不同场景激活即可。
  实验环境：
  centos7、home：DHCP、company：static，自动连接
  配置过程：配置信息会保存至/etc/sysconfig/network-scripts/ifcfg-name

  • 添加会话

    [root@xt ~]# nmcli connection add con-name company autoconnect yes ifname ens36 type ethernet 
    Connection 'company' (46f14092-152e-4af3-9273-5acbf573b2a2) successfully added.
    [root@xt ~]# nmcli connection add con-name home autoconnect no ifname ens36 type ethernet 
    Connection 'home' (d3c8a326-e494-47b9-b6ea-92f18998b9b6) successfully added.
    [root@xt ~]# nmcli connection show 
    NAME         UUID                                  TYPE            DEVICE      
    eno16777736  2361aff4-2de8-4868-9fd6-5d30ccdada02  802-3-ethernet  eno16777736 
    home         d3c8a326-e494-47b9-b6ea-92f18998b9b6  802-3-ethernet  --          
    company      46f14092-152e-4af3-9273-5acbf573b2a2  802-3-ethernet  ens36       
    [root@xt ~]# nmcli device status 
    DEVICE       TYPE      STATE      CONNECTION  
    eno16777736  ethernet  connected  eno16777736 
    ens36        ethernet  connected  company     
    lo           loopback  unmanaged  --          

  • 修改IP地址
    如果不修改默认为自动分配；
    [root@xt ~]# nmcli connection modify company ipv4.addresses 172.16.0.10/16 ipv4.method manual
    还可以配置DNS、gateway...
  • 查看效果

    [root@xt ~]# systemctl restart network #重启服务 
    [root@xt ~]# nmcli device status  #ens36当前自动连接至company会话
    DEVICE       TYPE      STATE      CONNECTION  
    eno16777736  ethernet  connected  eno16777736 
    ens36        ethernet  connected  company     
    lo           loopback  unmanaged  --          
    [root@xt ~]# ifconfig ens36 #ens36的ip信息配置正常
    ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
    inet 172.16.0.10  netmask 255.255.0.0  broadcast 172.16.255.255
    inet6 fe80::20c:29ff:fe20:b507  prefixlen 64  scopeid 0x20<link>
    ether 00:0c:29:20:b5:07  txqueuelen 1000  (Ethernet)
    RX packets 187  bytes 23730 (23.1 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 88  bytes 10998 (10.7 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    [root@xt ~]# nmcli connection up home  #将网卡会话切换至home会话
    Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/9)
    [root@xt ~]# nmcli device status 
    DEVICE       TYPE      STATE      CONNECTION  
    eno16777736  ethernet  connected  eno16777736 
    ens36        ethernet  connected  home        #ens36当前会话状态
    lo           loopback  unmanaged  --          
    [root@xt ~]# ifconfig ens36 #此时ip信息是自动获取
    ens36: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
    inet 192.168.175.133  netmask 255.255.255.0  broadcast 192.168.175.255
    inet6 fe80::20c:29ff:fe20:b507  prefixlen 64  scopeid 0x20<link>
    ether 00:0c:29:20:b5:07  txqueuelen 1000  (Ethernet)
    RX packets 190  bytes 24476 (23.9 KiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 98  bytes 12306 (12.0 KiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0