Kvm uses bond network card for bridging
[root@localhost network-scripts] # cat ifcfg-bond0 TYPE=EthernetBOOTPROTO=noneIPV6INIT=noDEVICE=bond0NAME=bond0DEVICE=bond0ONBOOT=yesBRIDGE=virbr0 [root@localhost network-scripts] # cat ifcfg-em1DEVICE=em1BOOTPROTO=noneMASTER=bond0SLAVE=yesONBOOT=yes [root@localhost network-scripts] # cat ifcfg-em2DEVICE=em2BOOTPROTO=noneMASTER=bond0SLAVE=yesONBOOT=yes [root@localhost network-scripts] # cat ifcfg-virbr0 DEVICE=virbr0BOOTPROTO=staticONBOOT=yesTYPE=BridgeIPADDR=10.10.54.11NETMASK=255.255.255.0GATEWAY=10.10.54.1DEFROUTE=yesPV4_FAILURE_FATAL=yesIPV6INIT=noDELAY=0USERCTL= no [root @ localhost network-scripts] # cat / etc/modprobe.d/bonding.conf alias bond0 bondingoptions bond0 miimon=100 mode=0 [root@localhost network-scripts] # modeprobe bonding this must be executed
