Hi Ole,
Thank you for your reply.
I am not using any tunneling protocol in my case(IPV6+UDP+ payload)
RFC 6935 says,
"The update is specified for use by a tunnel protocol that transports packets
that are themselves protected by a checksum."
>>> In VPP we basically leave it up to the application to decide if it
requires the UDP checksum or not.
So, will VPP maintain the same behavior even for non-tunneled IPV6 UDP
datagrams?
Thanks
Shiva
On Thu, Jan 2, 2020 at 4:03 PM <otr...@employees.org> wrote:
> Hi Shiva,
>
> > I was going through ip6 code, and observed VPP skips calculating UDP
> checksum for packets with explicit zero checksum, and process the packet
> "normally". (This, after disabling HW checksum offload)
> >
> > But, as per RFC-2460,
> > "IPv6 receivers must discard UDP packets containing a zero checksum, and
> should log the error."
> >
> > Is this expected behavior from VPP? Or will it be modified to be RFC
> compliant?
>
> The IPv6 UDP checksum behaviour was updated with RFC6935 and RFC6936.
> In VPP we basically leave it up to the application to decide if it
> requires the UDP checksum or not.
>
> Best regards,
> Ole
>
>
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