cd /etc/xen/scripts
vim my-network-bridge
#!/bin/bash
case "$1" in
start)
        /etc/xen/scripts/network-bridge start bridge=eth0 netdev=eth0 vifnum=0 antispoof=no
        #/usr/sbin/ethtool -K eth0 tx off
        /etc/xen/scripts/network-bridge start bridge=dummy0 netdev=dummy0 vifnum=1 antispoof=no
        #/usr/sbin/ethtool -K dummy0 tx off
;;
stop)
        /etc/xen/scripts/network-bridge stop bridge=eth0 netdev=eth0 vifnum=0
        /etc/xen/scripts/network-bridge stop bridge=dummy0 netdev=dummy0 vifnum=1
;;
restart)
$0 stop
$0 start
;;
status)
        /etc/xen/scripts/network-bridge status
;;
*)
echo "usage: $0 {start|stop|restart}"
esac
exit 0

chmod u+x /etc/xen/scripts/my-network-bridge

vim /etc/xen/xend-config.sxp

#(network-script network-bridge)
(network-script my-network-bridge)