iptables controls five different tables: filter, nat, mangle, raw and security.On a given call, iptables only displays or modifies one of these tables, specified by the argument to the option -t (defaulting to filter).To see the complete state of the firewall, you need to call iptables on each of the tables successively.. Additionally, to get an accurate representation of the rules, you need
iptables -t nat -I PREROUTING -p tcp -d $(nvram get wan_ipaddr) --dport 8000 -j DNAT --to 192.168.1.1:8000 Port Forwarding to a specific LAN IP. Port Forwarding can be accomplished from within the web interface here. However, the very same thing can be done a bit differently (tested and working), via command line. How to Use Netfilter on Your Linux System: Enabling a iptables -A INPUT -i ! lo -j REJECT iptables -A FORWARD -j REJECT. The first iptables command, for example, appends to the INPUT chain (-A INPUT) the rule that if the packet doesn’t come from the lo interface (-i ! lo), iptables rejects the packet (-j REJECT).. Before rejecting all other packets, you may add more rules to each INPUT chain to allow specific packets in. Quick-Tip: Linux NAT in Four Steps using iptables Then you'll need to configure iptables to forward the packets from your internal network, on /dev/eth1, to your external network on /dev/eth0. You do this will the following commands: # /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # /sbin/iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT # /sbin
How To Set Up a Firewall Using Iptables on Ubuntu 14.04
How IP forwarding Helps Connecting Private interface to Apr 22, 2015 An In-Depth Guide to iptables, the Linux Firewall Aug 29, 2017
With port forwarding, you can remote desktop to a back-end VM by using the IP address of the load balancer and the front-end port value defined in the NAT rule. In the portal, on the Overview page for MyLoadBalancer, copy its public IP address. Hover over the address and select the Copy icon to copy it.
How-To: Redirecting network traffic to a new IP using IPtables