> > Isn't the rhel way to install NetworkManager anyway? Because then you can forget all your ifcfg scripts anyway because they will be overwritten by NM. > At least that was the cause when i had NetworkManager installed... (That was why i removed it if i remember correctly) > Does anyone have a good link on that subject? > > IBM says that tap interfaces are best practice: > http://publib.boulder.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatkvmvirsh.htm > > My RHCSA course material doesn't even touch the subject (At least not until now). The Red Had documentation is only focused on using virt-manager and thereby explains not much in that regards. > Of course RHCSA doesn't touch this subject... That's very basic - RHCE doesn't cover this either in fact (or at least didn't 2 years back and I doubt that has changed). Don't look at IBM's stuff when you are using RHEL - always check docs.redhat.com - admittedly from the point you are at you may not know the actual question you need to ask anyway... NetworkManager doesn't support bridging (in rhel anyway) so you need to remove nm and use the regular network service configuring ifcfg appropriately to make all this work. Here's the relevant documentation you should be using for creating the bridge in the first place: https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s2-networkscripts-interfaces_network-bridge.html With that working it will then show as an interface to select when you create a vm.