bridge on linux Post: 72588

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Top Forums UNIX for Dummies Questions & Answers bridge on linux Post 72588 by hachik on Sunday 22nd of May 2005 10:56:15 AM

05-22-2005

Registered User

hm, i found following information in the internet, i think you all should know this, and thx all who tried to help.

Quote:

Originally Posted by http://gentoo-wiki.com/HOWTO_setup_a_gentoo_bridge#The_Gentoo_802.1d_Bridge_Guide

Creating 802.11/802.3 Bridges

Quite simply, Linux does not support this easily. From Jean Tourrilhes' site:
The conventional Ethernet bridging method (promiscuous sniffing) doesn't work with most wireless LAN standard, because of the header encapsulation and the interactions with link layer retransmissions. In other word, most often, when you use a software bridge on a wireless LAN (such as the Linux bridge on a 802.11 card), it doesn't work (moreover, quite often promiscuous is broken as well).
The driver could work around this restriction by creating its own MAC headers (802.11 headers instead of 802.3, and putting the right bits in the right place), but in fact most vendors don't provide the specification on how to this with their hardware (when they don't explicitely prevent it in hardware, to force you to buy their Access Points). (http://www.hpl.hp.com/personal/Jean_...ess.usage.html)

The eventual goal is to bridge a wireless network to a wired network. Fortunately, this is exactly what an access point does. There are several out there from which to choose. If you have lots of money or need VLAN/QoS support, the Cisco Aironet 1100 and Aironet 1200 access points are a great investment. If your budget is more of a requirement, the Linksys WAP54G or WRT54G are cheap and quite effective. (The Linksys Cable/DSL "routers" can easily be turned into a regular access point via a single selection box in the configuration.)

So rather than trying to hack a Linux 802.11/802.3 bridge together, spend the $100 and save yourself a lot of headach

hachik

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LEARN ABOUT NETBSD

atu

ATU(4)							   BSD Kernel Interfaces Manual 						    ATU(4)

NAME

     atu -- Atmel at76c50x 802.11B wireless network interfaces

SYNOPSIS

     atu* at uhub? port ?

DESCRIPTION

     The atu driver provides support for wireless network adapters based around the Atmel at76c503, at76c503a, at76c505, and at76c505a USB
     chipsets.

     Supported features include 802.11 and 802.3 frames, power management, BSS, IBSS, ad-hoc, and host-based access point mode.

     The atu driver encapsulates all IP and ARP traffic as 802.11 frames, however it can receive either 802.11 or 802.3 frames.  Transmit speed is
     selectable between 1Mbps fixed, 2Mbps fixed, 2Mbps with auto fallback, 5.5Mbps, 8Mbps, or 11Mbps depending on your hardware.

     Four different radio chipsets are used along with the device, each requiring a different firmware.

     By default, the atu driver configures the card for BSS operation (aka infrastructure mode).  This mode requires the use of an access point
     (base station).

     For more information on configuring this device, see ifconfig(8).

     The following devices are among those supported by the atu driver:

	   Acer Peripherals AWL400
	   AcerP AWL-300
	   Aincomm AWU2000B
	   Atmel 2662W-V4
	   Atmel BW002
	   Atmel DWL-120
	   Atmel WL-1330
	   Belkin F5D6050
	   Geowave GW-US11S
	   Linksys WUSB11
	   Linksys WUSB11-V28
	   Ovislink AirLive
	   SMC 2662W-AR

SEE ALSO

     arp(4), ifmedia(4), intro(4), netintro(4), usb(4), ifconfig(8), wiconfig(8)

AUTHORS

     The atu driver was written by Daan Vreeken and ported to OpenBSD by Theo de Raadt and David Gwynne.  The OpenBSD driver was then ported to
     NetBSD by Jesse Off <joff@NetBSD.org>.

BSD
								 January 23, 2005							       BSD