lug-bg: RE: lug-bg: Странен трафик

["b_ned" <b_ned@xxxxxxxxx>]

Виж това, може да ти е от полза...!!!


============================================================================
Ethernet flow/control
    *
     With large switches it is necessary to be able to limit the flow of
packets to avoid packet discarding following an overflow
    *
      Vendors had tried to implement non standard mechanism to overcome the
problem
    *
      One of this mechanism that could be used for half/duplex links is
sending carrier bursts to simulate a busy channel
    *
      This mechanism does’nt apply to full/duplex links
    *
      MAC control protocol : to support flow control on f/d links
          o a new ethernet type = 0x8808, for frames of 46 bytes (min
length)
          o first 2 bytes are the opcode other are the parameters
          o opcode = 0x0001 PAUSE stop txmitting
          o dst address = 01-80-c2-00-00-01 (an address not forwarded by
bridges)
          o following 2 bytes represent the number of 512 bit times to stop
txmission
===========================================================================

И това:
===========================================================================
● IEEE802.3x（全二重フロー制御／Full Duplex PAUSE Operation）
宛先アドレス      ＝ 01-80-C2-00-00-01
イーサネットタイプ＝ 0x8808
MAC制御命令       ＝ 0x0001
===========================================================================


-----Original Message-----
From: owner-lug-bg@xxxxxxxxxxxxxxxxxx
[mailto:owner-lug-bg@xxxxxxxxxxxxxxxxxx] On Behalf Of Иво Тачев
Sent: Tuesday, March 01, 2005 7:22 PM
To: lug-bg@xxxxxxxxxxxxxxxxxx
Subject: Re: lug-bg: Странен трафик

На 01 03 2005 18:30 Dragomir Zhelev написа:
> Здравейте,
>
> от няколко седмици наблюдавам с tcpdump сле
дния трафик :
>
>
> 18:22:17.358898 00:00:00:00:00:00 > 01:80:c2:00:00:01, ethertype Unknown
> (0x8808), length 60:
> --- cut ---
>
> П.С тия 00:00:00:00:00:00 > 01:80:c2:00:00:01 не са MAC адре
си от мрежата
> ми понеже претърсих за тях във всички ет
ерс бази без да открия каквото и да
> е.
>
ethertype е регистриран от Bay Networks - това може и
да помогне?

--
Иво Тачев
"ЕСКОРТ" СД - компютърен сервиз
тел. /02/963-04-02
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