Re: Bridging with WLAN interface

["Marcin M. Jessa" <lists%yazzy.org@localhost>]

Manuel Bouyer wrote:
> On Tue, Aug 05, 2008 at 10:58:36PM +0200, Marcin M. Jessa wrote:
> > Quentin Garnier wrote:
> > > On Tue, Aug 05, 2008 at 09:00:13PM +0200, Marcin M. Jessa wrote:
> > > [...]
> > > > Any idea why this isn't working? This is very strange.
> > > 802.11 is not 802.3 even if it's designed to act quite like it.  iwn(4)
> > > would have to make associations for all adresses it is bridging for.  I
> > > don't know if there is work currently to add such bridge capability
> > > to our net80211 layer in infrastructure mode.
> > Ok, thanks. So if my option is NATing, is there any reason why we don't 
> > have xen/scripts/vif-nat ?
>
> There is vif-ip. NAT is just a special case of IP routing, I don't think
> it needs a different script. 

Exactly, I just discovered I can do the same with the if-bridge script.
Please let me know if there is a better way of doing this:


Like I said I just used "bridge mode" and created an interface I know 
would not get occupied by anything else - tap100 :



# cat /etc/ifconfig.tap100
inet 192.168.0.1 netmask 255.255.255.0

And I made tap100 member of bridge0 (the same one as XEN uses):

# cat /etc/ifconfig.bridge0
create
!brconfig $int add tap100
up

# brconfig -a
bridge0: flags=41<UP,RUNNING>
        Configuration:
                priority 32768 hellotime 2 fwddelay 15 maxage 20
                ipfilter disabled flags 0x0
        Interfaces:
                xvif1.0 flags=3<LEARNING,DISCOVER>
                        port 8 priority 128
                tap100 flags=3<LEARNING,DISCOVER>
                        port 5 priority 128
        Address cache (max cache: 100, timeout: 1200):


The tap100 has IP in the same network as my DomU hosts and is used as 
DomUs's default route.

Then I just simply NAT traffic from my DomU hosts on both my wired and 
wireless interface using PF:

# Macros
wired_if="wm0"
wlan_if="iwn0"
xen_if="tap100"
xen_net="192.168.0.0/24"

nat on $wired_if from $xen_net to any -> ($wired_if)
nat on $wlan_if from $xen_net to any -> ($wlan_if)


Cheers,
Marcin.