I am new to qemu networking and pretty confused about the following situation. I launched 5 VMs. Each connects to br0 through a tap device. I also have a dnsmasq listening on br0 for DHCP.
The problem is dnsmasq does not hand out ip to VM according to the dhcp_host file I specified. The dhcp_host file has entries like: mac:ip. I thought when I put the mac addr in qemu, the dnsmasq should look up the ip from the dhcp_host file. But it didn't. Instead, it hands out ip randomly.
Now, when I checked with brctl. It shows 10 mac addresses instead of 5!? I searched a lot of qemu networking tutorials from google before come to ask here. None of them answer my questions. Could someone please explain the situation or give me some pointers? Thanks!
$ brctl show bridge name bridge id STP enabled interfaces br0 8000.1ed7c974ed93 no tap0 tap1 tap2 tap3 tap4
$ brctl showmacs br0 port no mac addr is local? ageing timer 1 02:2f:ef:29:be:36 no 1.73 1 1e:d7:c9:74:ed:93 yes 0.00 4 22:00:f4:a8:89:8a no 3.99 5 5a:e6:2a:d6:a0:50 yes 0.00 3 5e:18:64:12:3d:ec yes 0.00 3 72:22:53:51:f4:fa no 3.08 4 7a:e4:22:89:59:9a yes 0.00 5 82:9f:d3:6d:54:17 no 0.69 2 c2:fb:2a:3a:81:e9 no 32.99 2 e6:a6:7a:a4:49:d4 yes 0.00
Below is one sample qemu process info from
user 15983 99.9 8.0 5673100 5296180 ? Sl 12:29 214:30 qemu-system-x86_64 -enable-kvm -snapshot -no-shutdown -m 5120 -smp 2 -pidfile /home/user/vm-workingdir/instance-2/pid -monitor unix:/home/htrc/user/instance-2/monitor,server,nowait -serial file:/home/user/vm-workingdir/instance-2/release_mon -usb -net nic,vlan=0,macaddr=c2:b3:04:4b:8c:c8 -net tap,vlan=0,fd=3 -hda /home/user/vm-workingdir/instance-2/image.img -vnc :105,password