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Re: [lwip-users] fragmentation failure with stm32 if length > 1704
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From: |
Simon Goldschmidt |
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Subject: |
Re: [lwip-users] fragmentation failure with stm32 if length > 1704 |
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Date: |
Wed, 18 Dec 2019 12:35:17 +0100 |
ranran wrote:
> Hi,
>
> I've solved this issue after increasing size as was suggested here. Thanks !
> (The issue was also posted here:
> https://community.st.com/s/question/0D50X0000BozSc5SQE/ethernet-fragmentation-issues)
>
> Yet, whenever lwip receives (from PC) big packet , above its limit, it gets
> into exception as was described above.
I didn't quite get the post which seemed to suggest to increase some size, but
this still seems like a driver issue. lwIP does *not* in general have problems
with this!
>
> This seems like a high security issue.
Yes, it is!
>
> Any idea how it can be solved ?
Fix your driver :-)
Maybe your MAC just accepts jumbo packets? The idea of fragmentation is that
jumbo packets are split into multiple packets of 1514 bytes max each...
Regards,
Simon