Shorewall(8), shorewall-accounting(5), shorewall-actions(5), shorewall-blacklist(5), shorewall-hosts(5), shorewall-interfaces(5), shorewall-ipsec(5), shorewall-maclist(5), shorewall-masq(5), shorewall-nat(5), shorewall-params(5), shorewall-policy(5), shorewall-providers(5), shorewall-proxyarp(5), shorewall-route_rules(5), shorewall-routestopped(5), shorewall-rules(5), nf(5), shorewall-tcclasses(5), shorewall-tcdevices(5), shorewall-tcrules(5), shorewall-tos(5), shorewall-tunnels(5), shorewall-zones(5) NOTES 1. It specifies a SOURCE network for DNAT rules and a DESTINATON network for SNAT rules. iptables -t nat -A PREROUTING -d 1.2.3.0/24 -j NETMAP -to 5.6.7.0/24 iptables -t nat -list Chain PREROUTING (policy ACCEPT) target prot opt source destination NETMAP all - anywhere 1.2.3.0/24 5.6.7.0/24 Supported options for NETMAP target are : -to address /mask -> Network address to map to. NET3 (Optional) - network-address Added in Shorewall 4.4.11. NET2 - network-address Network in CIDR format For example, ppp0 in this file will match a m shorewall-interfacesm (8) entry that defines ppp+. Shorewall allows loose matches to wildcard entries in m shorewall-interfacesm (5). The interface must be defined in m shorewall-interfacesm (5). INTERFACE - interface The name of a network interface. I am trying to setup it on my OpenWRT router. However the traffic is still going to original IP, not 1.1.1.1:80. iptables -t nat -A OUTPUT -p tcp -dport 44444 -j DNAT -to-destination 1.1.1.1:80 iptables -t nat -A OUTPUT -p tcp -dport 44444 -j LOG -log-prefix. NET1 - network-address Network in CIDR format (e.g., 192.168.1.0/24). So I want to make all out-going traffic to port 44444 redirected to 1.1.1.1:80. iptables -t nat -A PREROUTING -d 10.25.39.0/24 -j NETMAP -to. If SNAT, traffic leaving INTERFACE with a source address in NET1 has it's source address rewritten to the corresponding address in NET2. iptables -t nat -A POSTROUTING -o eth0 -s 10.25.39.2 -j SNAT -to-source 44.92.21.5.

The second rule is needed only if you have default FORWARD policy DROP or REJECT. If DNAT, traffic entering INTERFACE and addressed to NET1 has its destination address rewritten to the corresponding address in NET2. Doing a basic google search youвЂ™ll find handful DNAT rule for this: iptables -A PREROUTING -t nat -i eth0 -p tcp -dport 8000 -j DNAT -to 192.168.1.1:8000 iptables -A FORWARD -p tcp -d 192.168.1.1 -dport 8000 -j ACCEPT. To use this file, your kernel and iptables must have NETMAP support included. NAME netmap - Shorewall NETMAP definition file SYNOPSIS /etc/shorewall/netmap DESCRIPTION This file is used to map addresses in one network to corresponding addresses in a second network.

Iptables netmap dnat