[CentOS-virt] OT: adding a wifi adapter to openvswitch

Thu Sep 24 11:47:30 UTC 2015
Alvin Starr <alvin at netvel.net>

Actually I do a similar thing.

I use a VM as my home/office firewall.

It works quite well and I would argue it is as secure as your standard 
firewall based on something like openWRT running on dedicated hardware.

I also run a wireless AP in bridged mode to allow local network access 
on an appliance.

There should be no reason that you could not put both on the same 
physical hardware.

As for the openvswitch original question.
Openvswitch has an API that you can access to manage your traffic along 
with supporting Openflow.
If you can get events from your wireless interface then you could write 
some programs to connect to the switch API.

I am not sure the overall result is worth the effort but it will teach 
you lots about your wifi interface and Openvswitch.

On 09/24/2015 06:59 AM, Dmitry E. Mikhailov wrote:
> On 09/24/2015 03:21 PM, C. L. Martinez wrote:
>> Thanks Dimitry, but I use wlan0 or eth0 to connect my laptop to
>> different networks. I use a vm as fw and I would like to have all vms
>> and laptop behind this fw vm guest.
>> Another option is to assign an IP to these interfaces and natting all
>> to this fw vm ... but I don't like this option
> It isn't going to be safe, simple and reliable. You won't have 
> anything like 'NetworkManager' on the laptop host OS. It either should 
> be heavily scripted or not done at all.
> You could write some fancy ebtables rules to do one-to-one MAC mapping 
> between the fw VM interface and host interface and run DHCP client on 
> the fw VM.
> On the host you'd have static route to another fw VM interface.
> But I can't imagine all the hotplug event scripting. How could fw VM 
> find out if it's time to (re-)run DHCP client? How would you configure 
> WPA keys on the host. How would find out if WiFi is disconnected, 
> cable is connected and it's time to redo MAC mapping with another MAC 
> address?
> Without some real effort it's going to be fully(partly?) manual config 
> with wpa_supplicant, ebtables and ssh'ing to fw VM involved. I doubt I 
> would like to change from NetworkManager to this stuff instead.
> That's why they do https://www.anonabox.com/
> Otherwise you can get some OpenWRT on a commodity router to run some 
> VPN or T#r or some other funny stuff
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