[libvirt-users] Setup a network

Hello, this isn't a bug report or an advanced usage question. This is just a question from a noob who is new to kvm and needs some help to setup a network between the host and the guests. If you're willing to spend a little time to help me out please continue reading :) See the attached image for more information. I have a host running with a public ip adress. I want to setup some vm for different tasks (webserver, mailserver, database, fileserver). I need to setup a network where the host can speak to the guests, the guest can speak to each other and the guests can speak to the host (meaning to the internet). The host also works as a firewall. Some examples: A) A package for the webserver (port 80) needs to be routed fron the host to the vm1. B) The mailserver needs to access the database. C) The mailserver needs to access the internet for sending an email. So every vm needs one interface. I don't know if it would work if I setup one virtual switch for the guest interconnections and use the host as a router to route the different ports to the vm interfaces. I hope this wasn't so confusing :) What would be the best way to accomplish my goal using virt-install and virsh. Thanks for everyone who is trying to help me out. Kind regards, Felix