Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Broken PMTUD for . + TLD servers, was: Re: Smallest Transit MTU

  • From: Iljitsch van Beijnum
  • Date: Sun Jan 09 18:41:11 2005

On 10-jan-05, at 0:08, Mark Andrews wrote:

	Well DNS (not EDNS) is limited to 512 octets so you unless there
	are real links (not ones artificially constrained to demonstrate
	a issue) this should not be a issue in practice.
No, fortunately not. But it's still VERY wrong and it must be fixed.

	Note for IPv6 one sets IPV6_USE_MIN_MTU on the UDP socket so this
	should be a non-issue there.
In IPv6 PMTUD is handled at the IP layer so the second packet that's too large will be fragmented at the source, so there is no issue.





Discussion Communities


About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home


Merit Network, Inc.