key length & fragmentation

[Bill Manning <bmanning@isi.edu>]

resend from last week.


        putzing about with keys of various lengths shows that 
        when keys are over a certain size, UDP fragmentation sets
        in,  In some cases, it is possible to actually get rollover
        to TCP (although this seems to be a corner case)

        now I've been told that UDP fragmentation can be a bad thing,
        leading to all sorts (well some kinds anyway) of odd 
        operational failures that are hard to debug.  UDP failure
        and rolling over to TCP is also considered a bad thing.

        so this question, "should key lengths be selected to 
        avoid fragmentation/TCP use?"

        if so, why?
        if not, why not?


-- 
--bill