[smokeping-users] Re: Biggest fping size

[Arnold Nipper]

On 23.03.2006 20:45 Edinilson J. Santos wrote

> Niko, take a look in the following results:
> 
> fping -b 8148 -C 5 -q -B1 -r1 172.16.254.150
> 172.16.254.150 : 86.02 69.94 69.15 103.19 87.92
> 
> fping -b 8149 -C 5 -q -B1 -r1 172.16.254.150
> 172.16.254.150 : - - - - -
> 
> As you can see, in the first test I've used 8148 bytes and in the second, 
> 8149 bytes.
> For some reason fping doesn't accept values above 8148 bytes.
> 

 From "man fping"

        -bn  Number of bytes of ping data to send.   The  minimum  size
             (normally 12) allows room for the data that fping needs to
             do its work (sequence number,  timestamp).   The  reported
             received  data  size  includes  the IP header (normally 20
             bytes) and ICMP header (8 bytes),  so  the  minimum  total
             size  is 40 bytes.  Default is 56, as in ping.  Maximum is
             the theoretical maximum IP  datagram  size  (64K),  though
             most  systems  limit  this  to a smaller, system-dependent
             number.


Arnold
-- 
Arnold Nipper, AN45

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