Interpreting ping response? (the POD lives??)

Charles Swiger cswiger at
Mon Apr 19 10:17:18 PDT 2004

On Apr 18, 2004, at 6:10 PM, Kevin D. Kinsey, DaleCo, S.P. wrote:
> A further question, if I may ... from a FBSD box at,
> I can ping up to  { -s 65507 }.  Windows XP at *.*.*.10
> responds as long as { -s < 25153 } ... if Ethernet Maximum is 1500,
> and that's the reason for the error <?>  why doesn't FreeBSD, or
> even Windows, elicit a similar response?  Nah, maybe that's a bad
> question ... they aren't the same OS ... :-(
> So, MTU is an OS feature/stat rather than general Ethernet?

You can send ICMP or UDP packets larger than the local MTU because the 
IP layer includes support for fragmenting datagrams if they are too 
big.  This capability works remarkably well but can be expensive in 
terms of system resources to break apart and reassemble fragments.

MTU is a parameter of a network transport layer, it has nothing to do 
with the OS...


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