Z Orinoca softwarovej AP udelat nejde. De to s kartami s Prism2 chipsetem, ke kterymu je dokumentace.
Jediny co pripada u orinoca v uvahu je provozovat vsechny karty v Ad-Hoc modu. Pokud na sebe nevidi kazdej s kazdym, musi se to trochu specialne routovat, a navic mame spatne zkusenosti kvuli vzajemnemu ruseni/pristupove metode....
Pokud na sebe vsichni vidi nemel by Ad-Hoc mod byt moc problem.
Vetsinou se dva AP navzajem spojit nedaji. Existuji vyjimky. Ke spojeni je tedy u jednoho z nich vetsinou potreba dalsi karta se smerovou antenou namirenou na ten druhy AP
Systém komunikace mezi AP a zároveň distribuce klientům v AP režimu je u hostap implementováno jako WDS. Systém wds funguje na 1 společném kanále, šířka pasma je omezena. WDS můze ušetřit náklady na infrastrukturu.
Viz hostap README.prism2:
--------------------------------------
Wireless distribution system (WDS)
==================================
IEEE 802.11 specifies a method for using wireless connection as a
distribution system. A special data frame with four addresses is
defined for this. This allows layer 2 bridging of packets (two
addresses, the immediate sender and receiver, are required for 802.11
frame acknowledgement; the other two addresses are the original
sending and receiver of the frame).
There is a bug in station firmware code used in Prism2/2.5 cards that
prevents standard-compliant 4-address frames being sent in Host AP
mode. To overcome this problem, the current version of the driver uses
a non-standard frame format, in which the 802.11 header has first
three addresses and the fourth address (which is usually also in the
header) is sent after the frame payload.
Note!
-----
Due to this non-standard frame format, this version of the driver does
not interoperate with standard-compliant AP devices as far as WDS
connections are concerned. The driver includes commented out code for
sending standard-compliant frames, should a fixed station firmware
become available for Prism2/2.5 cards.
The non-standard frame format should be identical to the one used in
OpenAP project (http://opensource.instant802.com/), so APs using their
code should interoperate (although this has not yet been tested).
Example WDS configuration:
- bridging between two wired network using a wireless link
- additional wireless net included in the bridge setup
Note! It should be needless to say, but this kind of bridging of wired
networks introduces serious security problems due to open nature of
the wireless network. This is just a simple example of what could be
done with bridging code and WDS links. Connections should be encrypted
in real networks, e.g., with IPSec, to prevent packets from being
captured of injected into the network.
Network 192.168.1.0/24 (same address space in each network)
<wired net A>--eth0 : AP-A : wlan0 -- <wireless net A>
|
WDS
|
wlan0 : AP-B : eth0--<wired net B>
Each AP has eth0 as the wired network device and Host AP driver loaded
and wlan0 as the wireless device.
AP-A: wireless LAN card with hwaddr 00:11:11:11:11:11, IP addr 192.168.1.1
AP-B: wireless LAN card with hwaddr 00:22:22:22:22:22, IP addr 192.168.1.2
(AP-B's wlan0 interface is not used in this example; all wireless
traffic goes through WDS link to AP-A using wlan0wds0)
'brctl show' should show br0 bridge with the added interfaces and STP
enabled.
'brctl showstp br0' should show more statistics about each bridge
port. 'state' should first be few seconds 'learning' and then change
to 'forwarding'.
'brctl showmacs br0' can be used to check behind which bridge port
each known mac addr is currently.
With this example configuration, the users of the network can be in
any of the three listed network. They can even move their computer to
another network and the bridging code will eventually (it seemed to
take about 30 seconds in my test; this can probably be adjusted with
bridge parameters) learn about the move. The bridging is performed on
layer 2, so other hosts in the 192.168.1.0/24 network look like they
were in the same physical network, no matter in which part of the
bridged network (wired net A, wired net B, wireless net A) they are.
Pod touto utilitou je možné karty s chipsetem Prism 2.X testovat ve vícero modech, jedním z modů je Wireless Distribution, což je WDS.
Do jaké míry to však skutečně funguje, to nedokážu v tuto chvíli posoudit.
Jen připomínám, že díky této utilitce se dá regulovat výstupní výkon karty. Lze vypínat ALC a nastavovat manuálně hexadecimální hodnoty do hardwarových registrů karty.
01.10.2002 v 08:21
