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ru.networks
- RU.NETWORKS ------------------------------------------------------------------
From : Michael Kochetov 2:5020/400 25 Dec 2003 10:34:44
To : Andrew Natolochny
Subject : Re: Wake on Lan
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Здравия желаю, Andrew!
Вы писали для Michael Kochetov, Thu, 25 Dec 2003 23:22:18 +0300:
===[Поскипано мною]===
MK>> Можно даже на Васике написать, я пpобовал, получается ...
AN> а можешь исходники бpосить??? плиз... на derza@ukr.net
Hе сохранилось ...
Использовался какой-то контрол для создания пакетов, самый стандартный ...
Описание технологии от AMD (вроде они разработали):
http://www.amd.com/us-en/ConnectivitySolutions/ConnectivityApplications/0,,50_23
32_2627_2481,00.html
=========Hачало цитаты==============
Magic Packet Technology Details
Once the LAN controller has been put into the Magic Packet mode, it scans all
incoming frames addressed to the node for a specific data sequence, which
indicates to the controller that this is a Magic Packet frame. A Magic Packet
frame must also meet the basic requirements for the LAN technology chosen, such
as SOURCE ADDRESS, DESTINATION ADDRESS (which may be the receiving station's
IEEE address or a MULTICAST address which includes the BROADCAST address), and
CRC. The specific sequence consists of 16 duplications of the IEEE address of
this node, with no breaks or interruptions. This sequence can be located
anywhere within the packet, but must be preceded by a synchronization stream.
The synchronization stream allows the scanning state machine to be much simpler.
The synchronization stream is defined as 6 bytes of FFh. The device will also
accept a BROADCAST frame, as long as the 16 duplications of the IEEE address
match the address of the machine to be awakened. If the IEEE address for a
particular node on the network was 11h 22h 33h 44h 55h 66h, then the LAN
controller would be scanning for the data sequence (assuming an Ethernet Frame):
DESTINATION SOURCE MISC. FF FF FF FF FF FF 11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33
44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66
11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33 44 55 66 11 22 33
44 55 66 MISC. CRC.
There are no other restrictions on a Magic Packet frame. For instance, the
sequence could be in a TCP/IP packet, an IPX packet, etc. The frame may be
bridged or routed across the network, without affecting its ability to wake up a
node at the destination of the frame.
If the LAN controller scans a frame and does not find the specific sequence
shown above, it discards the frame and takes no further action. If the
controller detects the data sequence, however, then it alerts the PC's power
management circuitry to wake up the system.
=========Конец цитаты================
--
Честь имею, Кочетов Михаил, Hовороссийск (colonel at nsma dot ru)
Si vis pacem para bellum
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