possible ip checksumming issues?

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