Port Forwarding and Redirection with iptables DNAT
In honeypot deployments, captive portals, or specialized traffic inspection environments, administrators often need to forward all incoming traffic—regardless of destination port—to a single listening service (such as an HTTP inspection proxy or logging daemon). This can be accomplished at line rate within the Linux kernel using Netfilter Destination NAT (DNAT) via iptables. Redirecting Inbound Port Ranges via DNAT To redirect all incoming TCP traffic across ports 1 through 65535 arriving on interface eth0 to an internal service listening on port 80 at 192.168.1.10: ...