[Dnsmasq-discuss] many tap devices, provide dhcp and ipv6 slaac

[Vasiliy Tolstov]

2016-05-27 17:56 GMT+03:00 Neil Jerram <neil at tigera.io>:
> Hi Vasiliy,
>
> I assume your TAP devices are _not_ bridged on the host?
>
> If so, you can use the same approach as we use for Calico networking in
> OpenStack -
> http://docs.openstack.org/developer/networking-calico/implementation-notes.html#dhcp
>
> You'll need:
>
> a dummy interface, with an address in the 85.143.220/24 CIDR
> to populate the dnsmasq hosts file with the IP/MAC mappings for your VMs
> to tell dnsmasq to listen on the dummy interface and all the TAPs, and treat
> the TAPs as aliases of the dummy interface (using --bridge-interfaces).
>
> Hope that helps - happy to provide more detail if you need.
>
>   Neil
>
>


Thanks! Does i need on dummy interface address with corresponding
netmask or i can use /32 address that acts like gateway for vm?
I have some discussion on libvirt mailing list about plain ethernet
devices and my next plans add ability to configure dnsmasq via libvirt
for this networks.
So in case of libvirt i have running dnsmasq on virtbr0 for example
and on each vm start i need to reconfigure dnsmasq to add needed tap
device to it? Why i can't use --interface=tap* ? DOes dnsmasq monitors
network intnerfaces via netlink and automatic listen it when it added
to the host?

-- 
Vasiliy Tolstov,
e-mail: v.tolstov at yoctocloud.net