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Hi,
pre-up tunctl -u foo -t tap0 address 172.20.0.1 netmask 255.255.255.0
I manually add tap0 to the bridge using:
sudo brctl addif br0 tap0
But, when running:
$ qemu -cdrom image.iso -serial stdio -net nic,model=rtl8139,vlan=0 -net tap,vlan=0 -m 200
It adds another tap1 interface to the bridge br0, when it executes /etc/qemu-ifup. What should be the correct setup?
I don't use any bridging at all. Just use the above command line, then qemu sets up everything needed using qemu-ifup. Afterwards you should see the new tap device in ifconfig's output - this is the interface you'll probably want to pass over to arping.
Bjoern