Apt-cacher

##### Apt-cacher Server ######
/etc/apt-cacher/apt-cacher.conf
cache_dir = /var/cache/apt-cacher
daemon_port = 3142
allowed_hosts = *

/etc/default/apt-cacher
AUTOSTART=1

/etc/iptables/up/rules
-A INBOUND -p tcp -m tcp --dport 3142 -j ACCEPT
-A INBOUND -p udp -m udp --dport 3142 -j ACCEPT

sudo /usr/share/apt-cacher/apt-cacher-import.pl -s /var/cache/apt/archives

sudo /etc/init.d/apt-cacher start

##### Apt-cacher Client #####
/etc/apt/apt.conf.d/01proxy
Acquire::http::Proxy "http://your-server:3142/apt-cacher/";