At 07:07 p.m. 20/08/2008, Sam Stickland wrote:
Yet all OSes have it enabled and there is no fallback to
fragmentation in PMTUD: if your system doesn't get the ICMP
messages, your session is dead in the water.
Windows Vista/2007 has black hole detection enabled by default. It's
not massively elegant, but it will keep sessions up (falls back to
536 byte MTU).
http://support.microsoft.com/kb/925280
IPv4 minimum MTU is 68 bytes, not 536. 536 is the minimum fragment
re-assembly buffer size. Falling back to 536-byte packets does not
guarantee that sessions will be kept up.
Kind regards,
--
Fernando Gont
e-mail: [EMAIL PROTECTED] || [EMAIL PROTECTED]
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