header cheksum error

[satj...@gmail.com]

Hi all,

I am trying to send udp multicast stream via ostinato.
I captured a udp multicast packet with wireshark and after opening it with ostinato I am trying to send it.
I can send the first packet but when I capture it with wireshark again I have an
Header checksum: 0xc537 [incorrect, should be 0xc4c5 (may be caused by "IP checksum offload" ?)].
What I am missing ?
I tried to modify manualy the IP checksum but the message is alway the same with the same value.

Regards
Tony

[Srivats P]

Did you edit any fields in the packet after importing? Edit the
stream, uncheck the (override) checkbox next to the checksum field, so
that Ostinato recalculates checksums.

When importing packets, Ostinato aims to preserve the exact same
content of the packet, so by default "overrides" all checksum fields
with the imported value rather than calculating them.

Srivats

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