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Re: [NANOG] Microsoft.com PMTUD black hole?
From: "Tomas L. Byrnes" <tomb () byrneit net>
Date: Wed, 7 May 2008 13:43:35 -0700
Some Edumacation on the topic is here: http://www.netheaven.com/pmtu.html
-----Original Message----- From: Iljitsch van Beijnum [mailto:iljitsch () muada com] Sent: Wednesday, May 07, 2008 1:35 PM To: Michael Sinatra Cc: nanog () merit edu Subject: Re: [NANOG] Microsoft.com PMTUD black hole? On 7 mei 2008, at 21:46, Michael Sinatra wrote:MS does in fact block _all_ ICMP at the edge of their network, that they are aware thatthis will infact break PMTUD, and that they have no current plans tochange thispractice which they have implemented in the interest of security.Perhaps they should also block _all_ TCP and UDP as well, and thenwe can moveon.I agree with Iljitsch that it happens frequently, but I think I am justified in expecting more than that from Microsoft.Anything lesswould be unprofessional.Right. Now Microsoft is also the company that built the OS that could be crashed by a maliciously crafted fragmented IP packet, so maybe there's something to this security policy. (One hopes that this bug and others like it are now fixed.) However, in that case the only workable course of action would be TO DISABLE PATH MTU DISCOVERY! You can't have your cake and eat it too. _______________________________________________ NANOG mailing list NANOG () nanog org http://mailman.nanog.org/mailman/listinfo/nanog
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Current thread:
- Re: [NANOG] Microsoft.com PMTUD black hole?, (continued)
- Re: [NANOG] Microsoft.com PMTUD black hole? Michael Sinatra (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Iljitsch van Beijnum (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Tomas L. Byrnes (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Nathan Anderson/FSR (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Iljitsch van Beijnum (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Nathan Anderson/FSR (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Tomas L. Byrnes (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Iljitsch van Beijnum (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Tomas L. Byrnes (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Nathan Anderson/FSR (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Tomas L. Byrnes (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Nathan Anderson/FSR (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Bjørn Mork (May 08)
- Re: [NANOG] Microsoft.com PMTUD black hole? Joel Jaeggli (May 08)
- Re: [NANOG] Microsoft.com PMTUD black hole? Iljitsch van Beijnum (May 08)
- Re: [NANOG] [OPSEC] Microsoft.com PMTUD black hole? Smith, Donald (May 08)
- Re: [NANOG] Microsoft.com PMTUD black hole? Hank Nussbacher (May 08)
- Re: [NANOG] Microsoft.com PMTUD black hole? Deepak Jain (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? SML (May 07)
- Re: [NANOG] Microsoft.com PMTUD black hole? Tony Finch (May 08)
- Re: [NANOG] Microsoft.com PMTUD black hole? Blaine Christian (May 08)