Contents
What is the physical network interface virtual network interface?
While physical networking connects computers through cabling and other hardware, virtual networking extends these capabilities by using software management to connect computers and servers over the Internet.
How many NICS do you want to connect?
Nics are fairly cheap. Normally recommended is 1 for mgmt,1 for kernel stuff, and 4-6 for the VM’s depending on how heavy IO they are. If you wantt SAN storgage add in 2 more and 2 more if using vmotion/clustering. Normally a dual port and quad port NIC extra are enough per server.
What does KVM mean by external IP address?
In this context, external means whatever your physical hosts are using, not necessarily non-private addresses. By default, KVM creates its own bridge, 192.168.122.1. This device acts as a virtual router for your virtual machines and will grant them IP addresses in this range. However, we want our machines to lease external addresses.
Can a KVM host be in routed mode?
This is due to the fact that the KVM host will immediately route the traffic from one internal virtual bridge to another (instead of routing back to the upstream router) and the iptables rules for routed networks is not configured to allow this.
How to set the default gateway in KVM?
Guest-side: Set the default gateway to the IP address of the host (make sure the host and guest IP addresses are in the same subnet): Note: If the host is not on the same subnet as the guest, then you must manually add the route to the host before you create the default route: Another option is using VDE (Virtual Distributed Ethernet).
How to create a KVM on a NAT Network?
First check the currently defined networks recognized by libvirt. Use the following command: To create a new NAT network, create an xml file “nat223.xml”. Use either the physical network or bridge name connected to the physical network for the “dev” attribute of the element.