How to block all tcp traffic on port 80 in iptables except for ip 1.1.1.1/32 for example?

Question

linux

Add to table with minimal CPU load.

Answer 1

# iptables -A INPUT -p tcp --dport 80 -j DROP
# iptables -A INPUT -s 1.1.1.1/32 -m state --state NEW -p tcp --dport 80 -j ACCEPT