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Just wondering if it's possible to have virtual networking interfaces that are accessible through the host's interface and IP?

Then I'd like to assign a subdomain to it and have the host direct to the correct guest based on that.

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Are you running KVM manually, or are you using libvirt (e.g. virt-manager or virsh?) – sciurus Jun 30 '11 at 14:51

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there are two ways - you can either use libvirt's own iptables implementation, so the VMs are behind a NAT, or you can set up a bridge and use it instead. The bridge will ct as a virtual hub, into which the host and the VMs are plugged. in the first scenario, the VMs will be "behind" the host, since it will be acting as a router to the hosts' virtual network in the second, the VMs will be in the same network as the host (you can add VLANs in of course, to separate them)

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You want a network bridge, then:

http://www.linux-kvm.org/page/Networking#public_bridge

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Are the IPs assigned to the virtual machines will be internal private addresses and I can reach them through the one physical interface? – kobrien Jun 29 '11 at 15:29
If you scroll up, that scenario is documented as well. – Rilindo Jun 29 '11 at 15:57
They asked that the virtual machines be accessible through the hosts IP. That is not what a bridge would do. – sciurus Jun 30 '11 at 14:50
If you look at the second part of the submitter's request, he also wants to point a subdomain to the VM. You can do that using NATing rules, but it would just be easier to put the VM with its own IP, setup a network bridge (assuming that he has a free IP to use). In either case, both options are documented on the KVM site. – Rilindo Jun 30 '11 at 16:13

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