crc32 calculation
in [Embedded]
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From: Grant Edwards on 1 Apr 2010 17:53 On 2010-04-01, steve_schefter(a)hotmail.com <steve_schefter(a)hotmail.com> wrote: > I'm not following that. In your original post you indicated, "i can > see the light blink bt nothing gets through to ethereal." But to > answer your question, it would depend on who causes the LED to blink > -- the card's interrupt routine or packet processor. In my experience, the LED blink is caused by circuitry in the PHY. -- Grant Edwards grant.b.edwards Yow! Are we THERE yet? at gmail.com
From: steve_schefter on 1 Apr 2010 21:53 On Apr 1, 2:05 pm, "salimbaba" <ark_lightz(a)n_o_s_p_a_m.yahoo.com> wrote: > Do you have any idea how should i feed the bytes to the CRC32 generator ? I realize that that was your original question and my hoping to show how to confirm that it really was a CRC issue didn't address that. I'm afraid that it has been quite a long time since I have done any CRC in code. At the time, I took a sample short packet from a trace similar to ethereal, then ran the numbers through my algorithm to see if I can up with the same CRC as the trace showed. Steve
From: Christof Klaiber on 6 Apr 2010 03:06 Am Thu, 01 Apr 2010 08:53:58 -0700 schrieb steve_schefter: >> My ethernet card has an on board crc calculator. > > That will stop packets with bad CRCs from getting through then. You are > likely correct that it is a CRC problem, but if you want to be sure, > you'll have to get another card or test against another PC. If your problem is your ethernet card dropping the packets, why don't you give your localhost interface a go? /Christof
From: Grant Edwards on 6 Apr 2010 10:01
On 2010-04-06, Christof Klaiber <christof.klaiber(a)merath-maschinen.de> wrote: > Am Thu, 01 Apr 2010 08:53:58 -0700 schrieb steve_schefter: > >>> My ethernet card has an on board crc calculator. >> >> That will stop packets with bad CRCs from getting through then. You are >> likely correct that it is a CRC problem, but if you want to be sure, >> you'll have to get another card or test against another PC. > > If your problem is your ethernet card dropping the packets, why don't you > give your localhost interface a go? How do you send packets from an external, single-board computer to a PC's localhost interface? -- Grant Edwards grant.b.edwards Yow! Civilization is fun! at Anyway, it keeps me busy!! gmail.com |