[e2e] Internet packet size distribution

[Tatsuya MORI]

> > > We traced the recommendations for 1300B MTU to several sources. For
> > > example VPN MTU recommendations, see our web page.
> > 
> > Could this be because of IPv6 traffic being tunneled in IPv4?
> > IPv6 requires that the link layer support an MTU of at least
> > 1280 bytes.  Add 20 bytes for an IPv4 tunnel header and you
> > get 1300 bytes.
> 
> The statistics of several IPv6 links have been collected by the
> researchers from MAWI WG, WIDE project.  
> We can see the jump at 1300B. 

It seems that the jumps measured on the v6 links are at 1280B of IP
packet length; although I don't know whether they are related to the
1300B measured on the v4 links (v6 over v4 tunneling?).

Here is an example obtained from the following v6 packet trace.
> http://tracer.csl.sony.co.jp/mawi/samplepoint-C/2005/200510250900.html

length  count
72      524317
60      410304
1500    236794
104     100459
64      72420
68      25436
94      23686
91      21196
81      20000
84      18906
80      17938
79      14239
108     14210
78      14140
141     13001
1280    12623 <--
89      12011
148     11987
...<snip>...

Best regards,
 
-- Tatsuya