注：本文基于CentOS 7.4編寫

1、網絡設備類型

linux網絡設備的抽象類型有：Bridge、VLAN、VETH、TAP等，我們可以通過ip命令查看系統支持的類型，

[root@master ~]# ip link help ... TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |bridge | bond | team | ipoib | ip6tnl | ipip | sit | vxlan |gre | gretap | ip6gre | ip6gretap | vti | nlmon | team_slave |bond_slave | ipvlan | geneve | bridge_slave | vrf | macsec }

2、查看指定設備的類型

2.1 通過ip命令

[root@master ~]# ip -d link show cni0 9: cni0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP mode DEFAULT group default qlen 1000link/ether d2:3f:f8:78:5f:7a brd ff:ff:ff:ff:ff:ff promiscuity 0 bridge ... [root@master ~]# ip -d link show flannel.1 8: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN mode DEFAULT group default link/ether de:cf:b3:4a:ba:08 brd ff:ff:ff:ff:ff:ff promiscuity 0 vxlan ... 10: vethe3c50e20@if3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue master cni0 state UP mode DEFAULT group default link/ether 06:15:32:92:43:25 brd ff:ff:ff:ff:ff:ff link-netnsid 0 promiscuity 1 veth ... [root@master ~]# ip -d link show kube-ipvs0 7: kube-ipvs0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default link/ether c6:88:49:fc:4c:78 brd ff:ff:ff:ff:ff:ff promiscuity 0 dummy ... [root@master ~]# ip -d link show virbr0-nic 4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN mode DEFAULT group default qlen 1000link/ether 52:54:00:76:db:df brd ff:ff:ff:ff:ff:ff promiscuity 1 tun ...

但是對于普通的網絡設備，倒是不顯示，

[root@master ~]# ip -d link show ens33 2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000link/ether 00:0c:29:7e:24:31 brd ff:ff:ff:ff:ff:ff promiscuity 0 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535

2.2 通過ethtool命令

[root@master ~]# ethtool -i cni0 | grep driver driver: bridge [root@master ~]# ethtool -i ens33 | grep driver driver: e1000 [root@master ~]# ethtool -i flannel.1 | grep driver driver: vxlan [root@master ~]# ethtool -i vethe3c50e20 | grep driver driver: veth [root@master ~]# ethtool -i virbr0 | grep driver driver: bridge [root@master ~]# ethtool -i virbr0-nic | grep driver driver: tun

但是對于虛擬設備這個方式不奏效，

[root@master ~]# ethtool -i kube-ipvs0 | grep driver Cannot get driver information: Operation not supported

總結

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