# 创建brdge br0
# brctl addbr br0

# 将br0绑定到ens33

# brctl addif br0 ens33

auto ens33
iface ens33 inet manual

auto br0

iface br0 inet static

           address 192.168.1.2

           network 192.168.1.0

           netmask 255.255.255.0

           broadcast 192.168.1.255

           bridge_ports eth0

           bridge_bridgeprio 32767

           bridge_portprio eth0 129

           bridge_fd 5

IFACE OPTIONS

       A   little  explanation  on  the  new  options  that  can  be  used  on

       /etc/network/interfaces to setup the bridge, so you don't  have  to  go

       and look at the scripts...

       bridge_ports interface specification

              this option must exist for the scripts to setup the bridge, with

              it you specify the ports you want to add to your bridge,  either

              using  "none" if you want a bridge without any interfaces or you

              want to add them later using brctl, or a list of the  interfaces

              you want to add separated by spaces, for example:

              bridge_ports eth0 eth4

              You  should  not  put any lines to configure the interfaces that

              will be used by the bridge, as this will be setup  automatically

              by the scripts when bringing the bridge up.

              If you need to specify the interfaces more flexibly, you can use

              the following syntax (most useful on a Xen dom0):

              bridge_ports regex (eth|vif).*

              This means to evaluate (as in  egrep(1))  the  expressions  that

              follow  after  "regex"  until  either  the  end  or  a "noregex"

              statement is reached.  The  regular  expressions  are  evaluated

              against all local interfaces and those that match are added.

              Specifying  "all"  is  short  for  "regex  eth.*  em.*  p[0-9].*

              noregex" and will get all the ethX and  biosdevname-format  (emX

              and pX) interfaces added to the bridge.

              Carrying this to the extremes, the following is valid syntax:

              bridge_ports all regex if.0 noregex ext0 regex vif.*

              This will add all ethX interfaces, the ifX0 interfaces, the ext0

              interface and all vifX interfaces.

       bridge_ageing time

              set ageing time, default is 300, can have a fractional part.

       bridge_bridgeprio priority

              set bridge priority, priority is between 0 and 65535, default is

              32768,  affects  bridge  id,  lowest priority bridge will be the

              root.

       bridge_fd time

              set bridge forward delay to time seconds,  default  is  15,  can

              have a fractional part.

       bridge_gcint time

              set  garbage  collection interval to time seconds, default is 4,

              can have a fractional part.  Available on Linux kernel  versions

              < 2.6.0.

       bridge_hello time

              set  hello  time  to  time  seconds,  default  is  2, can have a

              fractional part.

       bridge_hw MAC address

              set the Ethernet MAC address of the bridge to the specified one.

              There  were some concerns of how this was done in the past, see:

              http://bugs.debian.org/271406 but we are doing it on a  new  way

              now that shouldn't be as bad, see: http://bugs.debian.org/725786

              however you should know what you are  doing  before  using  this

              option.

       bridge_maxage time

              set  max  message age to time seconds, default is 20, can have a

              fractional part.

       bridge_maxwait time

              forces to time seconds the maximum time that the  Debian  bridge

              setup  scripts  will  wait  for  the  bridge ports to get to the

              forwarding status, doesn't allow factional part. If it is  equal

              to 0 then no waiting is done.

       bridge_pathcost port cost

              set  path  cost  for a port, default is 100, port is the name of

              the interface to which this setting applies.

       bridge_portprio port priority

              set port priority, default is 32, affects port id, port  is  the

              name  of  the interface to which this setting applies.  On Linux

              kernels older than 2.6.0 the max value is 255, the default  128.

              Newer kernels have a maximum value of 63 and a default of 32.

       bridge_stp state

              turn  spanning  tree protocol on/off, state values are on or yes

              to turn stp on and any other thing to set it  off,  default  has

              changed  to  off  for security reasons in latest kernels, so you

              should specify if you want stp on or off with this  option,  and

              not rely on your kernel's default behaviour.

       bridge_waitport time [ports]

              wait for a max of time seconds for the specified ports to become

              available, if no ports are specified  then  those  specified  on

              bridge_ports  will be used here. Specifying no ports here should

              not be used if we are using regex or "all" on  bridge_ports,  as

              it wouldn't work.