Non-Last Small IPv6 Fragments

[Timothy Winters <[e-mail]>]

We have encountered a potential Interoperability issue at the UNH-IOL while
running some testing.  The issue is around fragments.

The Linux Kernel updated based on the following CVE:

https://nvd.nist.gov/vuln/detail/CVE-2018-5391.

The fix was to reject IPv6 fragments less than 1280 that aren't last
fragment.  Section 4.5 of RFC 8200 allows for sending any fragment for
fragments as long they add up to the original packet.  This means that an
implementation that generates a non-last fragments with a size then 1280,
will be dropped by the updated kernel.

I'm willing to write a draft about the expected behavior, but before I do
that I wanted to get the working group feedback on if we think an
implementation should drop non-last fragments less then 1280.

~Tim