[libvirt-users] net passthrough (hostdev) and external DNS problem - libvirt host claims DNS update

hi everybody I'm having I pretty regular setup, so I'd like to think. Guest network is to use passthrough and a DNS+DHCP on a neighbour system gets requests and then DHCP updates DNS records but with libvirt host's name instead of guest's. Am I missing something here? How do make a guest claim DNS update and the not host on which that guest is running? many thanks P.