> 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
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: ma...@isc.org

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