On my system bytes are counted on the lo device for data transferred
there, there is no apparent problem with this (but I haven't checked very
closely).
As for ppp it just doesn't count the bytes. Install this patch
(against 2.1.45 but still applies to 2.1.65)
ftp://snoopy.virtual.net.au/Linux/kernel/patch/byte_count.45 to fix the
problem.
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