# I think that a set of rules that looks something like this would be easier
to maintain
# there are 500 little tricks that I could add if I was home and had my
notes

iptables -P INPUT DROP
iptables -A INPUT -i lo -j ACCEPT

#this will take care of all interfaces by default
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# maybe you should just use one interface for portage to connect through
such as eth0
# might also be a good plan to use the mac address instead of the ip it is a
little harder to spoof

#Allow rsync connections from study1 to update portage
iptables -A INPUT -i eth0 -p tcp -s 192.168.0.2 -m tcp --dport 873 -d
192.168.0.5 -j ACCEPT
#Allow tcp connections from study1 to download distfiles
iptables -A INPUT -i eth0 -p tcp -s 192.168.0.2 -m tcp --dport 1024 -d
192.168.0.5 -j ACCEPT
#      these rules are kinda taken car of by: iptables -P INPUT DROP
#       iptables -A INPUT -p tcp -i ${x} -j DROP
#        iptables -A INPUT -p udp -i ${x} -j DROP