I've got Comcast, and I have no issues with my internal network when
Comcast goes poof. Are you getting public IP address from Comcast for
all your computers, or do you have your network behind a router and
you're NATing, or do you have some other setup?

If you're home network is a private subnet, you should just be able to
add that subnet to the hosts.allow and/or /etc/exports and be fine.

Ie:

/bigdamndisk        192.168.1.0/255.255.255.0(rw)

-- 
Andrew S. Zbikowski | http://andy.zibnet.us
 A password is like your underwear; Change it
 frequently, don't share it with others, and
     don't ask to borrow someone else's.