[dns-operations] Limit on Name Servers & their IPs for a sub-domain

[Mark Andrews]

Makes basically no difference.

All but the first NS record takes 15 byte.  2 byte label + compression pointer.
Each A record takes 16 bytes.
Each AAAA record takes 28 bytes.

Going from *.root-servers.org -> *.r saves 15 bytes in the first NS record.

> On 13 Jan 2018, at 10:56 am, Rubens Kuhl <rubensk at nic.br> wrote:
> 
> 
> 
>> On 12 Jan 2018, at 10:06, James Stevens <James.Stevens at jrcs.co.uk> wrote:
>> 
>> On 12/01/18 01:19, George Michaelson wrote:
>>> 11 servers. 11 labels. 11 named entities, each with a single IPv6 binding..
>> 
>> In a world of IPv6 only, then can't you also safely assume an end-to-end MTU of 1280 and EDNS0 support - so would 11 still be the magic number?
>> 
> 
> 
> Only if the servers are of the *.root-servers.net format. They could be *.root-servers or *.root or *.rz or *.r and then a different number of them would fit into a given MTU, whether 512 or 1280. 
> 
> 
> 
> 
> Rubens
> 
> 
> 
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-- 
Mark Andrews, ISC
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