Re: 63/67 characters? Was RE: [wg-c] Consensus vote - "no" onprocedural grounds

[Karl Auerbach <karl@CaveBear.com>]

> the only other limitation is that the sum of all labes and dots [fqdn]
> must be less than 255 bytes, i think that this is an OS limtation.

Attached is the *official* Internet Standard on this matter.  These are
*not* OS limitations.  This RFC was issued more than 12 years ago, so
these are nothing new.

		--karl--


RFC 1035        Domain Implementation and Specification    November 1987

2.3.4. Size limits

Various objects and parameters in the DNS have size limits.  They are
listed below.  Some could be easily changed, others are more
fundamental.

labels          63 octets or less

names           255 octets or less

TTL             positive values of a signed 32 bit number.

UDP messages    512 octets or less