Generate packet with bad CRC
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Posted by Keul on June 21, 2007, 9:15 am
Please log in for more thread options Hi, Does someone know if there's a way to send ethernet packet with bad CRC, with a fiber optic card? And if it is also possible to count them on a fiber optic card? it seems that "ethtool -S eth0" can displays statistics including bad CRC packet count, but i don't know if it is possible with all fiber optic cards. Thanks for help Keul | ||||||||||||||||
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Posted by glen herrmannsfeldt on June 21, 2007, 4:04 pm
Please log in for more thread options Keul wrote: Many likely can count them, but not generate them. As far as I know, there are some cards specifically designed for use in testing that have extra abilities, and probably an extra large price tag. I don't know any specific model numbers, though. -- glen | ||||||||||||||||
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Posted by on June 24, 2007, 6:56 pm
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> Keul wrote:
> > Does someone know if there's a way to send ethernet packet with bad
> > CRC, with a fiber optic card? > > And if it is also possible to count them on a fiber optic card? > > it seems that "ethtool -S eth0" can displays statistics including bad > > CRC packet count, but i don't know if it is possible with all fiber > > optic cards. >
> Many likely can count them, but not generate them. As far as I know, > there are some cards specifically designed for use in testing that > have extra abilities, and probably an extra large price tag. > > I don't know any specific model numbers, though. Smartbits tester will do it, here is an arbitrary card that says it does bad crc generation. http://www.toyo-spirent.com/smartbits/pdf/gx1421a.pdf "CRC error generation capability." Not at all cheap. | ||||||||||||||||
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Posted by Keul on June 25, 2007, 8:41 am
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On Jun 25, 12:56 am, B...@hotmail.co.uk wrote: >
> > Keul wrote:
> > > Does someone know if there's a way to send ethernet packet with bad
> > > CRC, with a fiber optic card? > > > And if it is also possible to count them on a fiber optic card? > > > it seems that "ethtool -S eth0" can displays statistics including bad > > > CRC packet count, but i don't know if it is possible with all fiber > > > optic cards. >
> > Many likely can count them, but not generate them. As far as I know,
> > there are some cards specifically designed for use in testing that > > have extra abilities, and probably an extra large price tag. >
> > I don't know any specific model numbers, though.
>
> Smartbits tester will do it, here is an arbitrary card > that says it does bad crc generation. > > http://www.toyo-spirent.com/smartbits/pdf/gx1421a.pdf > "CRC error generation capability." > > Not at all cheap. Thanks for the link but I think i will try to use a cheaper way (a RJ45 ethernet product that can make crc error packets with a fiber converter.) (baybe I will arrive to disable the CRC filter of the converter...) So do you know witch fiber card and network (gigabit) card could count crc errors? For my fiber card : >ethtool -S eth2
no stats available
:( | ||||||||||||||||
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> CRC, with a fiber optic card?
> And if it is also possible to count them on a fiber optic card?
> it seems that "ethtool -S eth0" can displays statistics including bad
> CRC packet count, but i don't know if it is possible with all fiber
> optic cards.