Re: IPv6 root DNS change

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Frank Ellermann wrote:
> Stuart D. Gathman wrote:
> > I understand it is too late, since we already mentioned 512 in the
> > rfc.  But maybe a SHOULD support at least 811... 
>
> Of course 4408bis could adjust 512 to 811 if that's *really* common
> practice at this time (for the reasons stated by you).
>
> But what should the remaining receivers limited to what UDP offers do ? 
> They get a truncated policy.  What do existing implementations in this
> case if they don't pull "MAY ignore" in the RFC ?  Caveat, my DNS
> knowledge is extremely limited, I hope for a simple answer :-)

If the packet got truncated, its truncated bit is set and you cannot use 
the SPF record (trying to parse it from the packet anyway is likely to 
run you into the packet's end boundary anyway).

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