Generate packet with bad CRC


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


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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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glen herrmannsfeldt

Smartbits tester will do it, here is an arbitrary card that says it does bad crc generation.

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"CRC error generation capability."

Not at all cheap.

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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 :

no stats available :(

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