Not picking up partial updates

I have just installed FC7 and am having extreme difficulty in upgrading
as my dial up connection is reset every 2 hours and yum -y update will
not restart any partial updates made before the connection was lost.
This is not a problem for smaller files but for larger files having to
start from the beginning of say a 30mb evolution upgrade is very
annoying and makes downloading files greater than this impossible.

 I am dual booting with FC6 and have no problem there.If anyone can help
I would be much obliged. I have copies of my FC6 yum.conf file and
wonder if copying this to FC7 may work but I have no idea what the
problem can be as yum.conf help file does not really show options that
would apply.The only difference between the two files is:
pkgpolicy=newest
distroverpkg=redhat-release
tolerant=1
not present in FC7 yum.conf

many thanks in advance