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NIST and SP800-119

On Tue, Feb 15, 2011 at 10:09 AM, Joe Abley <jabley at hopcount.ca> wrote:
> On 2011-02-14, at 21:41, William Herrin wrote:
>> On Mon, Feb 14, 2011 at 7:24 PM, TR Shaw <tshaw at oitc.com> wrote:
>>> Just wondering what this community thinks of NIST in
>>> general and their SP800-119 (
>>> http://csrc.nist.gov/publications/nistpubs/800-119/sp800-119.pdf )
>>> writeup about IPv6 in particular.
>> Well, according to this document IPv4 path MTU discovery is,
>> "optional, not widely used."
> Optional seems right. Have there been any recent studies on how widely pMTUd is actually used in v4?

Hi Joe,

Are you aware of a TCP implementation in an OS that shipped within the
last decade but doesn't enable IPv4 pMTUd by default? Each version of
Windows and all the major unixes use it on every TCP connection unless
you explicitly turn it off.


William D. Herrin ................ herrin at dirtside.com? bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004