Prev-20 Home Next-20 1 msg BGP issues qwest in Burbank, CA 1 msg Looking for Yahoo-SOC contact 1 msg Cachefly Contact 2 msg auth*.ns.uu.net 1 msg auth00/auth100.ns.uu.net down ? 3 msg PCH BGP Archive down? 1 msg Looking for Flickr contacts 2 msg Charter - Southern Oregon routing issues 1 msg Google Contact 1 msg Bob Crooks/SaskTel/CA is out of the office. Microsoft.com PMTUD black hole? \ Nathan Anderson/FSR (6 May 2008) . \ Brandon Butterworth (6 May 2008) . . \ Iljitsch van Beijnum (6 May 2008) . . . \ Nathan Anderson/FSR (6 May 2008) . . . . \ Nathan Anderson/FSR (6 May 2008) . . . . \ Iljitsch van Beijnum (7 May 2008) . . . . . \ Nathan Anderson/FSR (7 May 2008) . . . \ Bjørn Mork (7 May 2008) . . \ Nathan Anderson/FSR (6 May 2008) . \ Robert Bonomi (6 May 2008) . . \ Tomas L. Byrnes (7 May 2008) . . . \ Marshall Eubanks (7 May 2008) . . . \ Nathan Anderson/FSR (7 May 2008) . . \ Nathan Anderson/FSR (7 May 2008) . . . \ Randy Bush (7 May 2008) . . . \ Glen Turner (7 May 2008) . . . . \ Mark Newton (7 May 2008) . . . . \ Patrick Giagnocavo (7 May 2008) . . . \ Rich Kulawiec (7 May 2008) . . . . \ Nathan Anderson/FSR (7 May 2008) . . . . . \ Michael Sinatra (7 May 2008) . . . . . . \ Iljitsch van Beijnum (7 May 2008) . . . . . . . \ Tomas L. Byrnes (7 May 2008) . . . . . . . . \ Nathan Anderson/FSR (7 May 2008) . . . . . . . . . \ Iljitsch van Beijnum (7 May 2008) . . . . . . . . . . \ Nathan Anderson/FSR (7 May 2008) . . . . . . . . . \ Tomas L. Byrnes (7 May 2008) . . . . . . . . . . \ Iljitsch van Beijnum (7 May 2008) . . . . . . . . . . . \ Tomas L. Byrnes (7 May 2008) . . . . . . . . . . \ Nathan Anderson/FSR (7 May 2008) . . . . . . . \ Tomas L. Byrnes (7 May 2008) . . . . . . . . \ Nathan Anderson/FSR (7 May 2008) . . . . . . . \ Bjørn Mork (8 May 2008) . . . . . . . . \ Joel Jaeggli (8 May 2008) . . . . . . . . . \ Iljitsch van Beijnum (8 May 2008) . . . . . . . . . . \ Smith, Donald (8 May 2008) . . . . . . \ Hank Nussbacher (8 May 2008) . . . . . \ Deepak Jain (7 May 2008) . . . . . . \ SML (7 May 2008) . . . . . . \ Tony Finch (8 May 2008) . . . . . . . \ Blaine Christian (8 May 2008) . . \ Stephen Sprunk (7 May 2008) . \ Iljitsch van Beijnum (7 May 2008) . \ Nathan Anderson/FSR (7 May 2008) . . \ Tomas L. Byrnes (7 May 2008) . . . \ Nathan Anderson/FSR (7 May 2008) . . . \ Matthew Petach (12 May 2008) . \ Michael Sinatra (7 May 2008) . \ Scott Weeks (8 May 2008) . \ Janet Sullivan (8 May 2008) . . \ Niels Bakker (8 May 2008) 4 msg Strange network behaviour 1 msg Was Burma off the air due to the Cyclone ? 17 msg OSPF minutia, and, technote publication venues 2 msg Deadline Extension UBICOMM 2008, September 29 -... 1 msg [Fwd: Re: outages] 2 msg outages 21 msg Did Youtube not pay their domain bill? 9 msg Introducing latency for testing? 33 msg fair warning: less than 1000 days left to IPv4 ... Prev-20 Home Next-20

Prev-Msg Prev-Thread Nanog May-2008 Next-Thread Next-Msg Subject: Re: Microsoft.com PMTUD black hole? Group: Nanog From: Nathan Anderson/FSR Date: 7 May 2008 Tomas L. Byrnes wrote: > The remedy you have below is NOT the only one, and is, in fact, a > non-sequitur in this case. How so? Iljitsch is suggesting that ICMP blockers originate packets without DF set if they are going to block the ICMP messages that PMTUD needs in order to work in the first place. That's what (I think) he means by "disabling path MTU discovery." > The network-level solution to ping of death is to BLOCK fragmented > packets, and the way to ensure this doesn't self-deny-service is to > perform PMTUD and Black-Hole Router discovery. Which end are you talking about here, the servers or the client? If the servers, how do you expect them to do PMTUD if they _can't hear the ICMP messages_? Also, for some reason, as I pointed out before, XP black hole router discovery doesn't seem to be working for me for whatever reason. Does anybody have any clue why that might be the case? -- Nathan Anderson First Step Internet, LLC nathana _______________________________________________ NANOG mailing list NANOG http://mailman.nanog.org/mailman/listinfo/nanog Prev-Msg Prev-Thread Nanog May-2008 Next-Thread Next-Msg

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