Iptables scratchpad
From thelinuxwiki
dynamically create iptables commands which allow gentoo emerge sync and fetch
on firewall to forward for gentoo servers
nslookup rsync.gentoo.org | grep -v "#" | grep Address |awk '{ printf "iptables -I FORWARD -p tcp -d " $2 " --dport 873 -j ACCEPT\n"}' nslookup distfiles.gentoo.org | grep -v "#" | grep Address |awk '{ printf "iptables -I FORWARD -p tcp -d " $2 " --dport 80 -j ACCEPT\n"}'
on firewalls, to update / sync the firewalls themselves
nslookup rsync.gentoo.org | grep -v "#" | grep Address |awk '{ printf "iptables -I OUTPUT -p tcp -d " $2 " --dport 873 -j ACCEPT\n"}' nslookup distfiles.gentoo.org | grep -v "#" | grep Address |awk '{ printf "iptables -I OUTPUT -p tcp -d " $2 " --dport 80 -j ACCEPT\n"}'