> On Mar 10, 2016, at 9:29 AM, Poscic, Kristian (Nokia - US) > <[email protected]> wrote: > > Hi, > > Does anyone have any info on the percentage of UDP packets with zero-checksum > for IPv4 packets in today’s networks (enterprise, internet, any network). > Seems like there is not a whole lot of info about this on the WEB. Anyone has > any firsthand/realworld experience with this? Thanks. > > Kris
A good place to start might be https://tools.ietf.org/html/rfc6936 6936 Applicability Statement for the Use of IPv6 UDP Datagrams with Zero Checksums. G. Fairhurst, M. Westerlund. April 2013. (Format: TXT=99557 bytes) (Status: PROPOSED STANDARD) (DOI: 10.17487/RFC6936) The big consideration there is a middleware device (usually a router, but potentially something else) that is receiving packets at line rate one a set of interfaces and funneling them to another interface on which it is obligated to send them tunneled in UDP packets, or a corollary device at the other end of the tunnel. It would be theoretically possible to add hardware that could parse to the correct point and calculate the checksum while the data being received was stored into memory. However, practically, that is far more likely to be done as a second step, to packets it is applicable to. The configuration of a tunnel that creates or verifies a UDP checksum on a tunneled datagram, in such a case, is essentially a DOS vector. Any discussion of "percentages of traffic for which X is true in the Internet" are necessarily vague and hand-wavy. The Internet is the proverbial elephant, and those that would statistically describe it are the proverbial philosophers. How one describes it has a lot to do with what part of it one touches.
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