[libvirt-users] How to start guset os with specified IP address

Hi! Dear everyone. I met a problem with virsh. What should I do if I hope to start my guest os with specified IP address and guest os can be accessed by external computers? I tried to use route mode to configure my virbr0, but it cannot assign an IP to my guest os! If virbr0 are set NAT mode and act as a switch with dhcp, then the guest os cannot be accessed by external computer. note: Ubuntu server are install in host without xwindows, so I have to work with command line. Thanks!