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asked 2026-01-09 10:22:09 +0000

threinem gravatar image

UDP datagram wrongly reassembled

I am analyzing a 10G SR connection between an IoT device and a Linux computer without a switch in between. Captured data is here The filter ip.fragment.error shows some errors, eg for packet: 1125980. But this packet is correct. However the following datagram is not correctly reassembled.

wrongly reassembled packet image

Packet 1125995 is regarded as last fragment, but it has the "more fragments flag" set. It is followed by two additional packets, where 1125997 has a cleared "more fragments flag" and is not used for reassembling.

What's wrong with this packets?

I'm using version 4.6.2

Thanks

Tom

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updated 2026-01-09 11:41:22 +0000

grahamb gravatar image

UDP datagram wrongly reassembled

I am analyzing a 10G SR connection between an IoT device and a Linux computer without a switch in between. Captured data is here

The filter ip.fragment.error shows some errors, eg for packet: 1125980. But this packet is correct. However the following datagram is not correctly reassembled.

wrongly reassembled packet image

Packet 1125995 is regarded as last fragment, but it has the "more fragments flag" set. It is followed by two additional packets, where 1125997 has a cleared "more fragments flag" and is not used for reassembling.

What's wrong with this packets?

I'm using version 4.6.2

Thanks

Tom