I have been using bridge network for guests. When I used other virtualisation software, there was not a significant delay of network connection at the guest’ start-up.
But for QEMU-KVM (VirtManager) it seems that it takes 10+, maybe 20+ seconds for the network connection becomes available. This is apparent when the guest is a Ubuntu server. It has by default some sort of service that waits at the boot until the network is connected. So, whenever I start the guest, the boot scroll stops at waiting for network connection.
Is this normal for KVM? Again, I did not have this problem with other hypervisors.