iptables -t filter -S iptables -t nat -S iptables -t mangle -S If the firewalld does it job, then you should see familiar rules within the -t nat and in forwarding chains within -t filter. Fascinating.
Linux 2.4 NAT HOWTO: Saying How To Mangle The Packets There is a specialized case of Destination NAT called redirection: it is a simple convenience which is exactly equivalent to doing DNAT to the address of the incoming interface. ## Send incoming port-80 web traffic to our squid (transparent) proxy # iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 \ -j REDIRECT --to-port 3128 nat - Prerouting with iptables, destination port to DHCP I have an iptables rule that translates requests to the same IP from different internal hosts by changing the source port. iptables -t NAT -A POSTROUTING -p TCP -d 173.32.1.2 --dport 873 \ -m state --state NEW,ESTABLISHED -j SNAT --to-source 173.32.1.1:44000-44300
% nft add rule inet nat prerouting dnat ip to 10.0.0.2 % nft add rule inet nat prerouting dnat ip6 to feed::c0fe Incompatibilities. You cannot use iptables and nft to perform NAT at the same time before kernel 4.18. So make sure that the iptable_nat module is unloaded:
sudo iptables -t nat -A PREROUTING -p tcp --dport 2221 -j DNAT --to-destination 192.168.2.100:2222 >sudo iptables -t raw -L Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination >sudo iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source Port Forwarding Using iptables - SysTutorials Dec 28, 2019
Apr 20, 2018
Jul 13, 2020 · examples of SNAT, DNAT with iptables for Advantech, Conel routers, with comments (probably will work on other routers where iptables can be manipulated, care needs to be taken on applying these commands after reboot) - snat_dnat_advantech.md sudo iptables -t nat -A PREROUTING -p tcp --dport 2221 -j DNAT --to-destination 192.168.2.100:2222 >sudo iptables -t raw -L Chain PREROUTING (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination >sudo iptables -t nat -L Chain PREROUTING (policy ACCEPT) target prot opt source