On 10/28/08 04:22, Kacheong Poon wrote: > Darren Reed wrote: > >> Correction: in theory this should only impact UDP traffic, >> in practice it affects UDP *and* TCP traffic. > > > Why in theory fragmentation should only impact UDP > traffic? What is in the protocol spec which says > that there cannot be TCP fragments? In theory, it > can happen with any traffic... > > In practice, I think most fragments in the Internet > are UDP traffic, such as streaming media data. At > least this is what the study I've read some years ago > indicates (*). For this kind of app, I believe it is > the response from server which is being fragmented. > And I guess to load balance this type of traffic, a > DSR set up is appropriate and the fragment issue does > not matter. > > The above study is old and I don't know if there is > any recent one. But given that nowadays most, if > not all, client TCP stacks in use support PMTUd, I > suspect that TCP fragments should be even rarer than > the data in the above study shows. Do you have data > showing that the above is no longer true in today's > Internet?
There is the continued feedback from ipfilter users that harass me when fragmentation things don't work. The problem isn't that "most fragments on the internet are UDP", it is the small percentage of TCP packets that are, which when not handled correctly, cause lots of noise. Darren _______________________________________________ networking-discuss mailing list [email protected]
