possible ip checksumming issues?

[Samium Gromoff]

     I`ve got a following problem with kernels
 2.4.4-2.4.7 on two different hosts, two different
 modems (so it hardly can be an hardware issue):
 when i try to gather some files ( http://uwsg.iu.edu/hypermail/linux/kernel/0108.1/0367.html
 for example) receive stalls at some fixed offsets,
 which ones are strictly individual for each failing file.
 these errors are unrecoverable, i.e. i can`t by any
 means download such files.

 it seems to me that these errors are strictly data-
 dependent, so i made an assumption  about ip checksumming.

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cheers,

   Samium Gromoff