[Qemu-discuss] Bridging not working across qemu guests.

[dE]

Hi!

I'm trying to get 2 qemu guest to connect via bridging. This is what I'm 
doing --

modprobe tun;ip tuntap add mode tap veth;ip a add fc00::1001/124 dev 
veth;ip link set dev veth up

qemu-system-x86_64 -machine accel=kvm,kernel_irqchip=on,mem-merge=on 
-drive 
file=centos7.qcow,id=centos,if=ide,media=disk,cache=unsafe,aio=native,index=0 
-vnc :2 -no-acpi -device e1000,id=ethnet,vlan=0 -net 
tap,ifname=veth,script=no,downscript=no,vlan=0 -m 512

modprobe tun;ip tuntap add mode tap veth0;ip a add fc00::1003/124 dev 
veth0;ip link set dev veth0 up

qemu-system-x86_64 -machine accel=kvm,kernel_irqchip=on,mem-merge=on 
-drive 
file=centos7_2.qcow,id=centos,if=ide,media=disk,cache=unsafe,aio=native,index=0 
-vnc :2 -no-acpi -device e1000,id=ethnet,vlan=0 -net 
tap,ifname=veth0,script=no,downscript=no,vlan=0 -m 512
ensure to change default IP in VM2.

ip a del fc00::1003/124 dev veth0
ip a del fc00::1001/124 dev veth
ip link set dev veth down
ip link set dev veth0 down
brctl addbr br
brctl stp br off
brctl addif br veth veth0
ip link set dev veth up
ip link set dev veth0 up
ip link set promisc on dev veth0
ip link set promisc on dev veth
ip link set dev br up
ip a add fc00::1001/124 dev br

The host can connect to both the VMs, and the VMs can ping it back, BUT 
the VMs cannot connect to each other. They claim "destination 
unreachable"; that means routes are present.

I've tried with both CentOS and system rescue CD.

Thanks or any help.