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`virbr0` 和 `virbr0-nic` 的作用是什麼？

tag-icon • tag-icon networking kvm libvirt
`virbr0` 和 `virbr0-nic` 的作用是什麼？

在我的 CentOS 7.2 中，我安裝了以下軟體包：

yum install -y epel-release qemu-kvm libvirt virt-install bridge-utils

然後當我展示時ip a：

[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether e8:9a:8f:50:4a:dc brd ff:ff:ff:ff:ff:ff
    inet 13.19.241.25/29 brd 13.19.241.31 scope global em1
       valid_lft forever preferred_lft forever
    inet 13.19.241.26/8 brd 13.255.255.255 scope global em1
       valid_lft forever preferred_lft forever
    inet6 fe80::ea9a:8fff:fe50:4adc/64 scope link 
       valid_lft forever preferred_lft forever
3: em2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether e8:9a:8f:50:4a:dd brd ff:ff:ff:ff:ff:ff
    inet 103.193.241.25/29 brd 103.193.241.31 scope global em2
       valid_lft forever preferred_lft forever
    inet6 fe80::ea9a:8fff:fe50:4add/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:f9:a9:cf 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
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:f9:a9:cf brd ff:ff:ff:ff:ff:ff

您會看到新增了兩個網路設備：virbr0和virbr0-nic。它們是什麼，它們的作用是什麼？

哪個軟體包安裝了增加的兩個設備？

答案1

當您安裝libvirt服務時，會virbr0自動建立一個virtual network switch.

所有虛擬機器都將連接到virbr0.

預設virbr0使用NAT模式，可以透過NAT模式提供Internet存取。預設會virbr0指派位址192.168.122.1，並且可以為連接到它的其他虛擬介面提供 DHCP 服務。

如果你使用，你可以找到一個名為brctl show的介面：virbr0virbr0-nic

[root@localhost network-scripts]# brctl show
bridge name bridge id       STP enabled interfaces
...
virbr0      8000.5254003caaaa   yes     virbr0-nic

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