Rick Stevens wrote:
I have. It's a nightmare, but unfortunately many Asian ISPs use it to spam. Makes your iptables and firewall rules rather nasty.
You should not be using iptables or firewall rules to fight spam. That is a losing battle.
Also, you should not make ridiculous statements such as "Asian ISPs use (non-contiguous masks) to spam".
-- You are in a maze of little twisting passages, all alike.