From mboxrd@z Thu Jan  1 00:00:00 1970
From: Axel Neumann <axel@open-mesh.net>
Subject: Re: [B.A.T.M.A.N.] two-way-tunnel quirks
Date: Tue, 4 Dec 2007 10:05:46 +0100
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To: The list for a Better Approach To Mobile Ad-hoc Networking <b.a.t.m.a.n@open-mesh.net>

Hi,

On Dienstag 04 Dezember 2007, Jan Hetges wrote:
> Hi Axel
>
> On Sun, Dec 02, 2007 at 07:54:24PM +0100, Axel Neumann wrote:
> > ...
> >
> > > > - Can you describe it in way that i can reproduce it ?
> > >
> > >   A---B---C
> > >
> > > A: your computer
> > >
> > > B: bmxd_rv804  client node      }
> > >                                  }running 2-way-tunnel
> > > C: bmxd_rv804    gw node        }
> >
> > I am just curious, can you confirm if the following correctly
> > describes the HNA/SNAT of your setup:
> >
> > for the two-way-tunnel setup:
> >  - you were doing SNAT at Cs' upstream interface AND at Bs' bat0
> > interface
>
> MASQUERADE
>
> > for the one-way tunnel setup:
> >  - you are only doing SNAT at Cs' upstream interface
>
> no, i still do MASQUERADE also on Bs' bat0, because i was too lazy to
> comment it out ;-)

Interesting to know that this is possible, because (as I understand):

- Internet Uplink packets are MASQUERADEd (*) when being entunnelled at Bs' 
bat0 interface and a second time at your upstream GW interface

 A          B                C      
eth0    eth0 bat0        bat0 dsl0   Internet
 >---------->*===============>*--------->
        MASQUERADE       MASQUERADE


- Downlink packets are de-MASQUERADED (*) at Cs' upstream interface (dsl0).
But using one-way-tunnel, the Downlink packets are NOT routed via the 
bat-tunnel, therefore downlick packets will not come out of Bs' bat0 
interface and (I thought) would not be de-MASQERADEd (?) !

 A          B                C      
eth0    eth0 wlan0      wlan0 dsl0   Internet
 <----------<?---------------<*---------<
       de-MASQUERDE?   de-MASQUERADE 


catched my draft ? Please correct me if I misunderstood!

ciao
/axel 


>
> >  - and additionally an HNA announcement by B for the address used by A
>
> yes, but also with 2-way-tunnel (because i want net internal routing)
>
> cheers
>
>   --Jan