How to apt-get over ssh tunnel through a firewall?

[Mitchell Laks <mlaks@post.harvard.edu>]

Hi,

I have a number of debian  machines that live behind a firewall. 

Debian Machine A is granted internet access and can browse
the internet. However machines B-D were not granted internet access and live on the general internal network,
and were originally installed with Debian by utilizing a private network with machine A
192.168.4.x, and getting internet access via NAT through A. 

Now machines B-D no longer live on the private network but can ssh into machine A.

Now I know how to browse the internet on B-D 
by creating  a ssh tunnel to A and utilizing the Iceweasel Browser settings to use a 
local Socks proxy.


Can I do something similar with  apt-get so that I can apt-get update and apt-get upgrade 
over ssh without
physically moving the machines B-D to the private network 192.168.4.x with machine A?


thanks,
mitchell