[libvirt-users] nwfilter and address of network ip address

[Nicolas Bock]

On Mon, May 08, 2017 at 03:35:19PM +0100, Daniel P. Berrange wrote:
>On Sat, May 06, 2017 at 08:09:49PM -0400, Dan wrote:
>> On Fri, May 5, 2017 at 4:29 PM, Nicolas Bock <nicolasbock at gmail.com> wrote:
>>
>> > Hi,
>> >
>> > I am running a webserver on the libvirt host and would like to add a
>> > nwfilter such that a VM can access that server. The corresponding iptables
>> > rule would look like this:
>> >
>> > iptables --append INPUT --in-interface virbr0 --destination 192.168.122.1
>> > --protocol tcp --dport 80 --jump ACCEPT
>> >
>> > where the network is using virbr0 and sits at 192.168.122.1. I don't want
>> > to hardcode the host IP address in the nwfilter so that I can use that
>> > filter for other networks. Is it possible to reference the host's IP
>> > address in the filter?
>
>There is a pre-defined parameter for the VM's own IP address:
>
>  http://libvirt.org/formatnwfilter.html#nwfelemsRulesAdvIPAddrDetection
>
>but we don't have anything for the host's IP address. We could fairly
>easily add it though I reckon - eg provide a HOST_IP parameter.

Thanks Daniel.

>Regards,
>Daniel