nanog mailing list archives
Re: IP Fragmentation
From: Iljitsch van Beijnum <iljitsch () muada com>
Date: Mon, 25 Aug 2008 12:56:34 +0200
On 25 aug 2008, at 12:27, Fernando Gont wrote:
http://support.microsoft.com/kb/925280
IPv4 minimum MTU is 68 bytes,
That's kind of like "a human being can live without food for four to six weeks". It's not a recommendation.
536 is the minimum fragment re-assembly buffer size. Falling back to 536-byte packets does not guarantee that sessions will be kept up.
But:"PMTU black hole router detection is triggered on a TCP connection when TCP starts retransmitting full-sized segments with the DF flag set. TCP resets the PTMU for the connection to 536 bytes. Then, TCP retransmits its segments when the DF flag is clear."
Current thread:
- RE: IP Fragmentation, (continued)
- RE: IP Fragmentation Tony Li (Aug 28)
- Re: IP Fragmentation Glen Kent (Aug 28)
- Re: IP Fragmentation Iljitsch van Beijnum (Aug 29)
- Re: IP Fragmentation Valdis . Kletnieks (Aug 29)
- Re: IP Fragmentation Jim Shankland (Aug 20)
- Re: IP Fragmentation Iljitsch van Beijnum (Aug 20)
- Re: IP Fragmentation Sam Stickland (Aug 20)
- Re: IP Fragmentation Fernando Gont (Aug 25)
- Re: IP Fragmentation Iljitsch van Beijnum (Aug 25)
- Re: IP Fragmentation Simon Leinen (Aug 26)
- RE: IP Fragmentation Tim Sanderson (Aug 20)