On Thu, Apr 16, 2020 at 11:40:59PM -0400, Rich Felker wrote:

> TC bit is for truncation, and means that the complete response would
> have been larger than 512 bytes and was truncated to whatever number
> of whole RRs fit in 512 bytes.

Actually whole RRsets.  Nameservers must not truncate in the middle of
an RRset.  Stub resolvers need to perform TCP retries on TC=1.

-- 
    Viktor.

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