管理IPv4网络连接
1. 使用 nmcli 检查所有连接
[root@desktop1 ~]# nmcli connection NAME UUID TYPE DEVICE eno33554960 5be7dba9-6baf-407d-9227-88c034fb7e9c 802-3-ethernet -- Bridge eno16777736 d2d68553-f97e-7549-7a26-b34a26f29318 bridge br0 System eno16777736 8863e6a4-94da-488b-9de7-160b3b5951c8 802-3-ethernet eno16777736 virbr0 b50fb815-6e76-49d3-937b-bbe0b7b137c1 bridge virbr0 eno50332184 8e064c29-9aad-433c-a75e-1f80e6051018 802-3-ethernet -- [root@desktop1 ~]#
2. 删除‘virbr0’外的所有 connection
[root@desktop1 ~]# nmcli connection delete 'Bridge eno16777736' 'System eno16777736' 'eno50332184'
3. 使用 ip addr 和 ping 确认你的 desktop 无法访问网络
[root@desktop1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:7a brd ff:ff:ff:ff:ff:ff 3: eno33554960: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:84 brd ff:ff:ff:ff:ff:ff 4: eno50332184: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:8e brd ff:ff:ff:ff:ff:ff 6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether a2:11:a8:b3:ca:97 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever [root@desktop1 ~]# ping 192.168.0.254 connect: Network is unreachable [root@desktop1 ~]#
4. 创建一个新的 connection，名称为 net1，接口为你的 desktop 的第一个网卡(eno16777736)，开启自动连接 (查看网卡信息：nmcli device status)
[root@desktop1 ~]# nmcli connection add con-name net1 type ethernet ifname eno16777736 autoconnect yes Connection 'net1' (4e2cba1b-b8ff-4036-812f-9772d2a5cdd8) successfully added. [root@desktop1 ~]#
5. 修改 net1，IPv4 地址为手动地址，地址是 192.168.0.1/24 ，网关和 dns 是 192.168.0.254
[root@desktop1 ~]# nmcli connection modify net1 ipv4.addresses '192.168.0.1/24 192.168.0.254' ipv4.dns '192.168.0.254' ipv4.method manual [root@desktop1 ~]#
6. 重新启动 net1，确认 IP 地址是静态 IP 地址
[root@desktop1 ~]# nmcli connection up net1 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4) [root@desktop1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:7a brd ff:ff:ff:ff:ff:ff inet 192.168.0.1/24 brd 192.168.0.255 scope global eno16777736 valid_lft forever preferred_lft forever inet6 fe80::20c:29ff:fe94:d37a/64 scope link valid_lft forever preferred_lft forever 3: eno33554960: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:84 brd ff:ff:ff:ff:ff:ff 4: eno50332184: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:94:d3:8e brd ff:ff:ff:ff:ff:ff 6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN link/ether a2:11:a8:b3:ca:97 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever [root@desktop1 ~]# ip route default via 192.168.0.254 dev eno16777736 proto static metric 1024 192.168.0.0/24 dev eno16777736 proto kernel scope link src 192.168.0.1 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 [root@desktop1 ~]# ping 192.168.0.254 PING 192.168.0.254 (192.168.0.254) 56(84) bytes of data. 64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=0.688 ms 64 bytes from 192.168.0.254: icmp_seq=2 ttl=64 time=0.658 ms ^C --- 192.168.0.254 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2003ms rtt min/avg/max/mdev = 0.658/0.681/0.698/0.027 ms [root@desktop1 ~]#
7. 修改 net1，增加一个 dns 地址为 192.168.1.254
[root@desktop1 ~]# nmcli connection modify net1 +ipv4.dns '192.168.1.254' [root@desktop1 ~]# nmcli connection up net1 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5) [root@desktop1 ~]# cat /etc/resolv.conf # Generated by NetworkManager search example.com nameserver 192.168.0.254 nameserver 192.168.1.254 [root@desktop1 ~]#
8. 修改 net1，删除上一步配置的 dns192.168.1.254，但保留 192.168.0.254
[root@desktop1 ~]# nmcli connection modify net1 -ipv4.dns '192.168.1.254' [root@desktop1 ~]# nmcli connection up net1 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6) [root@desktop1 ~]# cat /etc/resolv.conf # Generated by NetworkManager search example.com nameserver 192.168.0.254 [root@desktop1 ~]#
9. 编辑 hosts 文件，确保访问“myserver”会被解析为 192.168.0.(100+X )
[root@desktop1 ~]# echo '192.168.0.101 myserver' >> /etc/hosts [root@desktop1 ~]# ping myserver PING myserver (192.168.0.101) 56(84) bytes of data. 64 bytes from myserver (192.168.0.101): icmp_seq=1 ttl=64 time=0.679 ms 64 bytes from myserver (192.168.0.101): icmp_seq=2 ttl=64 time=0.509 ms 64 bytes from myserver (192.168.0.101): icmp_seq=3 ttl=64 time=0.595 ms 64 bytes from myserver (192.168.0.101): icmp_seq=4 ttl=64 time=0.773 ms ^C --- myserver ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3004ms rtt min/avg/max/mdev = 0.509/0.639/0.773/0.097 ms [root@desktop1 ~]#
