Weird downloads

[Fred Grant]

When I need to download large files I either go to my son's house (cable
modem) or a friend's house (dsl) or the library (no one seems to know
what they use).

On the dsl system, he downloaded a file of about 90 Mb in about 2
seconds but nothing was on it (zero bytes).

On the cable system, I downloaded F7 ISO in bout 2 seconds but nothing
was on it.  This was from a mirror that indicated extremely high speed
downloads.

In both of the above I changed download sources and was successful,
although it took quite a bit longer.  Also, all of the above use Windows
systems.

What do you think is going on here?
-- 
Fred