[e2e] Internet packet size distribution
rishisin at usc.edu
Wed Oct 26 12:55:46 PDT 2005
On Wed, 26 Oct 2005, John Heidemann wrote:
> On Mon, 24 Oct 2005 11:05:25 PDT, "Ghanwani, Anoop" wrote:
> >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.
> Good point.
> My assumption is that VPN'ed traffic is much, much more common than
> tunneled IPv6 (particularly at USC where all wireless was VPNed until
> recently), but it would be good to validate that assumption.
None of the 1300B packets seen in our Los Nettos and USC Internet2 traces
seem to be tunneled IPv6. The protocol field is almost always 6 (TCP) or
17 (UDP). It's never 41 (IPv6).
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