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Russ Allbery <rra@stanford.edu> wrote:
> Lars Magne Ingebrigtsen <larsi@gnus.org> writes:
>> Anyway, I just realized that totally relying on
>> `make-network-process' isn't necessary at all -- DNS can be done
>> perfectly well via TCP as well.
>
> Just be warned that this won't work with some DNS servers, since the DNS
> protocol requires that you try UDP first and only fall back to TCP if the
> server returns a truncated response.  Some DNS servers that already know
> that their entire response database fits into UDP packets will therefore
> choose not to listen or respond to TCP connections at all (since DNS over
> TCP is a widely used attack target for bugs in BIND).

But Gnus will be talking to a resolver, not to an authoritative data
server.  Resolvers don't know what the data that passes through them
will look like, so they'd better support TCP.  I don't know of any
that don't.


paul