virbr1    Link encap:Ethernet  HWaddr 52:54:00:82:3e:4e
          inet addr:192.168.100.1  Bcast:192.168.100.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:615 errors:0 dropped:0 overruns:0 frame:0
          TX packets:355 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:47897 (47.8 KB)  TX bytes:34634 (34.6 KB)

virbr2    Link encap:Ethernet  HWaddr 52:54:00:4f:a0:f3
          inet addr:192.168.101.1  Bcast:192.168.101.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:129 errors:0 dropped:0 overruns:0 frame:0
          TX packets:133 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:11775 (11.7 KB)  TX bytes:12674 (12.6 KB)

liunx@liunx-G41MT-S2PT:~/Work/DocBook/work/code-farmer-note/examples/chapter8$ cat router.sh
#!/bin/bash -
set -o nounset
# Treat unset variables as an error
/usr/local/bin/qemu-system-i386
    -m 64M
    -kernel images/bzImage
    -hda images/rootfs.ext2
    -append "root=/dev/sda console=ttyS0"
    -enable-kvm
    -daemonize
    -vnc :51
    -net nic,vlan=0,model=e1000,macaddr=52:54:00:12:34:01
    -net tap,vlan=0,ifname=router1,script=router1-ifup,downscript=router1-ifdown
    -net nic,vlan=1,model=e1000,macaddr=52:54:00:12:34:02
    -net tap,vlan=1,ifname=router2,script=router2-ifup,downscript=router2-ifdown
    -net nic,vlan=2,model=e1000,macaddr=52:54:00:12:34:11
    -net vde,vlan=2,sock=/tmp/lan1.ctl[]
    -net nic,vlan=3,model=e1000,macaddr=52:54:00:12:34:12
    -net vde,vlan=3,sock=/tmp/lan2.ctl[]
    -net nic,vlan=4,model=e1000,macaddr=52:54:00:12:34:13
    -net vde,vlan=4,sock=/tmp/lan3.ctl[]
    -net nic,vlan=5,model=e1000,macaddr=52:54:00:12:34:14
    -net vde,vlan=5,sock=/tmp/lan4.ctl[]