On Tue, 15 Feb 2011, Steven Bellovin wrote:
On Feb 15, 2011, at 10:36 54AM, William Herrin wrote:
On Tue, Feb 15, 2011 at 10:09 AM, Joe Abley <[email protected]> wrote:
On 2011-02-14, at 21:41, William Herrin wrote:
On Mon, Feb 14, 2011 at 7:24 PM, TR Shaw <[email protected]> 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.
All modern TCPs support it; many firewalls are configured to block the
necessary ICMPs.
Then probably blackholing themselves the firewall operators....
Best Regards,
Janos Mohacsi
