> On 17 Jan 2019, at 6:56 am, Mark Andrews <ma...@isc.org> wrote:
>
> While legal it is most definitely not a good idea. You first have to probe to
> find out the EDNS buffer size. Then you may also need to deal with PMTUD
> issues. The you need to deal with broken middle boxes and fragmentation.
> Dealing with all of this is done at the application level. Add to that TCP
> still needs to be supported on the server anyway there really is no point in
> trying.
>
> Named does not attempt to send larger than 512 byte updates via UDP. There
> are no plans to do so.
s/named/nsupdate/
> --
> Mark Andrews
>
>> On 17 Jan 2019, at 00:14, Fumiya Obatake <fobat...@gmail.com> wrote:
>>
>> Is it possible to use nsupdate with edns0?
>>
>> Hello, all.
>> I have some questions about nsupdate.
>>
>> I try to update a set of TXT records over 512 bytes in all by using
>> nsupdate without -v option, and it makes TCP connection automatically.
>> In RFC2136, `An update transaction may be carried in a UDP datagram,
>> if the request fits, or in a TCP connection (at the discretion of the
>> requestor).`, so I guess this behavior is due to the not fitting
>> request packet (since over 512 bytes).
>> But RFC6891, EDNS0, should be able to use over 512 bytes DNS message.
>> I think this is applicable to DNS update, but no one refers to it as
>> far as I can see.
>>
>> My question is:
>> 1. Does it violate RFC2136 to use EDNS0 with DNS Update?
>> 2. If not, does BIND have any plan to implement nsupdate with EDNS0?
>> 3. Or, is any other solution to update over 512 bytes message by UDP?
>>
>> Best regards,
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--
Mark Andrews, ISC
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PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org
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