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问题：ns33mtu 1500 qdisc noop state DOWN group default qlen 1000
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解决方法：
1 root@topcheer ~]# systemctl stop NetworkManager 2 [root@topcheer ~]# systemctl disable NetworkManager 3 Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service. 4 Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service. 5 Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service. 6 Removed symlink /etc/systemd/system/network-online.target.wants/NetworkManager-wait-online.service. 7 [root@topcheer ~]# service network restart 8 Restarting network (via systemctl): [ 确定 ] 9 [root@topcheer ~]# ifconfig 10 docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 11 inet 172.17.0.1 netmask 255.255.0.0 broadcast 0.0.0.0 12 ether 02:42:3b:db:cd:21 txqueuelen 0 (Ethernet) 13 RX packets 0 bytes 0 (0.0 B) 14 RX errors 0 dropped 0 overruns 0 frame 0 15 TX packets 0 bytes 0 (0.0 B) 16 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 17 18 ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 19 inet 192.168.180.113 netmask 255.255.255.0 broadcast 192.168.180.255 20 inet6 fe80::20c:29ff:fe4d:6737 prefixlen 64 scopeid 0x20<link> 21 ether 00:0c:29:4d:67:37 txqueuelen 1000 (Ethernet) 22 RX packets 10 bytes 1168 (1.1 KiB) 23 RX errors 0 dropped 0 overruns 0 frame 0 24 TX packets 28 bytes 4696 (4.5 KiB) 25 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 26 27 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 28 inet 127.0.0.1 netmask 255.0.0.0 29 inet6 ::1 prefixlen 128 scopeid 0x10<host> 30 loop txqueuelen 1000 (Local Loopback) 31 RX packets 68 bytes 5604 (5.4 KiB) 32 RX errors 0 dropped 0 overruns 0 frame 0 33 TX packets 68 bytes 5604 (5.4 KiB) 34 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 35 36 virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 37 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 38 ether 52:54:00:27:04:0d txqueuelen 1000 (Ethernet) 39 RX packets 0 bytes 0 (0.0 B) 40 RX errors 0 dropped 0 overruns 0 frame 0 41 TX packets 0 bytes 0 (0.0 B) 42 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 43 44 [root@topcheer ~]#