R: [Voyage-linux] How to realize a Point to Point Connection

Tue Feb 7 00:59:29 HKT 2006

Seems to not work for me and my test setup, proxy arp makes it work (sort
of). Although something else maybe going on I have not quite learned how
madwifi-ng all works.

> Hi guys,
> Same as managed mode, I think you can't bridge in Ad-hoc mode, am I right?
>
> - Punky
>
> Tommaso wrote:
>>
>> Thank you Andrew and Punky,
>>
>> I made the first links using one wrap in Master mode with 802.11g, in
>> this mode I can successfully connect to the AP with my laptop getting
>> up to 24 Mbps of ftp transfer rate.
>>
>> Then I have switched two Wraps in Ad-Hoc mode and 802.11a giving the
>> same SSID to both the Wrap and then I have tried a link within few
>> meters. I have connected a PC via eth0 to each Wrap, then I tried to
>> exchange IP traffic between the PCs. I can exchange IP traffic between
>> the two clients but at very low speed < 1 Mbps and with iwconfig
>> "saying" that the speed was 0 kbps.
>>
>> Maybe it’s an IP configuration problem.
>>
>> I use the following IP configuration for both the clients of the
>> bridge, this is the interfaces file for one client:
>>
>> /auto eth0/
>>
>> /iface eth0 inet static/
>>
>> / address 192.168.2.11/
>>
>> / netmask 255.255.255.0/
>>
>> / /
>>
>> /auto ath0/
>>
>> /iface ath0 inet static/
>>
>> / address 192.168.2.1/
>>
>> / netmask 255.255.255.0/
>>
>> / broadcast 192.168.2.255 /
>>
>> / up iwconfig ath0 essid VOYAGEM mode Ad-Hoc/
>>
>> / up nat.sh ath0 eth0 "192.168.2.0/24"/
>>
>> Then I have created a script file inserted in the if-up.d directory:
>>
>> /iwpriv ath0 mode 1
>>
>> iwconfig ath0 enc off
>>
>>
>> #Bridge
>> brctl addbr br0
>> brctl addif br0 eth0
>> brctl addif br0 ath0
>> ifconfig br0 192.168.2.21 netmask 255.255.255.0
>> ifconfig br0 up
>> #End Bridge
>> /
>>
>> The IP configuration was the following:
>>
>> Client1 Client2
>>
>> ath0: 192.168.2.1 ath0:192.168.2.2
>>
>> eht0: 192.168.2.11 eht0:192.168.2.12
>>
>> br0: 192.168.2.21 br0: 192.168.2.22
>>
>> PC: 192.168.2.31 PC: 192.168.2.32
>>
>> I haven’t used route rules because surprisingly the two PCs could see
>> each other without any route rule. It’s seems a little strange, I
>> haven’t fully understood why.
>>
>> Looking at the Andrew example I have understood that it’s not
>> necessary to assign an IP to the ath0 and eth0 when they are bridged,
>> is it correct?
>>
>> Thanks for the advices.
>>
>> Tommaso
>>
>> -----Messaggio originale-----
>> Da: Punky Tse [mailto:punkytse at punknix.com]
>> Inviato: lunedì 6 febbraio 2006 6.01
>> A: Punky Tse
>> Cc: Tommaso; voyage-linux at voyage.hk
>> Oggetto: Re: [Voyage-linux] How to realize a Point to Point Connection
>>
>> Tommaso,
>>
>> I got your meaning wrong... I thought you are talking about long
>>
>> distance link.
>>
>> What mode (a/b/g) do you run master mode before and what mode for
>>
>> Ad-hoc? It sounds like you set 11b/g mode in master and then switch to
>>
>> 11a for ad-hoc? If using 11a, does the antenna support 5 GHz?
>>
>> The one of the difference betweeen pre1 nad pre3 is madwifi driver.
>>
>> pre1 uses madwifi-old while pre3 uses madwifi-ng (r1408). I had tested
>>
>> the madwifi-ng with Ad-hoc and it can even communicate to RM2 (prism54)
>>
>> with good throughput in 11b/g mode (e.g. downloading Apple movie
>>
>> trailer). If pre3 makes no difference then its not driver problem.
>>
>> - Punky
>>
>> Punky Tse wrote:
>>
>> > Tommaso,
>>
>> >
>>
>> > It is a tricky for tuning madwifi for long distance link. See:
>>
>> >
>>
>> > http://madwifi.org/wiki/UserDocs/LongDistance
>>
>> >
>>
>> > Punky
>>
>> >
>>
>> > Tommaso wrote:
>>
>> >>
>>
>> >> Hi to all,
>>
>> >>
>>
>> >> I’m actually using the 0.2pre1 version over a Wrap board with one CM9
>>
>> >> card. I have no problem having the ath0 interface working in Master
>>
>> >> Mode, I get a very good Access Point. Now I’m interested in testing
>>
>> >> the possibility to perform long (>5 Km) point to point links. I’m not
>>
>> >> a 802.11a-guru, so maybe I’m wrong, but I have put the ath interface
>>
>> >> of both clients in Ad-Hoc mode with the same SSID. I get the two
>>
>> >> clients connecting each other but with a very very low speed < 1Mps,
>>
>> >> the iwconfig reports 0 Kbps even if the received signal is bigger
>>
>> >> than -18 dBm (when the two clients are few meters away). I have
>>
>> >> changed the radio cards and the antenna, but it definitely seem a
>>
>> >> software problem.
>>
>> >>
>>
>> >> It’s a problem of the madwifi driver included in the 0.2pre1?
>>
>> >>
>>
>> >> Tomorrow I will update to the 0.2pre3 version, but I would to know if
>>
>> >> the Ad-Hoc mode is the best one for a point to point link; in fact,
>>
>> >> reading the madwifi-ng documentation I am a bit confused since you
>>
>> >> can use both the Ad-Hoc (iwconfig) mode and the WDS functionality
>>
>> >> putting one client in STA mode and the other one in AP mode.
>>
>> >>
>>
>> >> Thanks.
>>
>> >>
>>
>> >> Tommaso
>>
>> >>
>>
>> >> ------------------------------------------------------------------------
>>
>> >>
>>
>> >> _______________________________________________
>>
>> >> Voyage-linux mailing list
>>
>> >> Voyage-linux at list.voyage.hk
>>
>> >> http://list.voyage.hk/mailman/listinfo/voyage-linux
>>
>> >>
>>
>> >
>>
>> >
>>
>> --
>>
>> Regards,
>>
>> Punky
>>
>> P U N K N ! X . c o m
>>
>> Technology + Lifestyle
>>
>> (http://www.punknix.com)
>>
>> Voyage Linux
>>
>> (http://www.voyage.hk/software/voyage.html)
>>
>
>
> --
> Regards,
> Punky
> P U N K N ! X . c o m
> Technology + Lifestyle
> (http://www.punknix.com)
>
> Voyage Linux
> (http://www.voyage.hk/software/voyage.html)
>
>
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