iptables -t nat -A POSTROUTING -p TCP -j MASQUERADE --to-ports 1024-31000: Explanation: The --to-ports option is used to set the source port or ports to use on outgoing packets. Either you can specify a single port like --to-ports 1025 or you may specify a port range as --to-ports 1024-3000. In other words, the lower port range delimiter and
iptables is a command line interface used to set up and maintain tables for the Netfilter firewall for IPv4, included in the Linux kernel. The firewall matches packets with rules defined in these tables and then takes the specified action on a possible match. iptables -t nat -A POSTROUTING -p TCP -j MASQUERADE --to-ports 1024-31000: Explanation: The --to-ports option is used to set the source port or ports to use on outgoing packets. Either you can specify a single port like --to-ports 1025 or you may specify a port range as --to-ports 1024-3000. In other words, the lower port range delimiter and Aug 10, 2012 · iptables -A FORWARD -s 0/0 -i eth0 -d 192.168.1.58 -o eth1 -p TCP \ --sport 1024:65535 --dport 80 -j ACCEPT iptables is being configured to allow the firewall to accept TCP packets for routing when they enter on interface eth0 from any IP address and are destined for an IP address of 192.168.1.58 that is reachable via interface eth1. The /sbin/iptables application is the userspace command line program used to configure the Linux IPv4 packet filtering rules. Since Network Address Translation (NAT) is also configured from the packet filter rules, /sbin/iptables is used for this, too. There is a similar tool for IPv6 networks aka iptables-ipv6. Apr 28, 2011 · iptables -t nat -I PREROUTING 1 -j LOG iptables -t nat -I POSTROUTING 1 -j LOG iptables -t nat -I OUTPUT 1 -j LOG. These rules are not permanent a restart of the iptables service will flush them, to make them permanent execute. service iptables save. now take a peek inside /var/log/messages to see whats happening. To see it live execute
sudo sysctl -w net.ipv4.ip_forward=1 sudo iptables -A FORWARD -i wlan0 -j ACCEPT sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE I really dislike how search engines make the algorithm out to be some evil type of hack.. I use it merely so share my internet with my android phones.
Step-By-Step Configuration of NAT with iptables. This tutorial shows how to set up network-address-translation (NAT) on a Linux system with iptables rules so that the system can act as a gateway and provide internet access to multiple hosts on a local network using a single public IP address. iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables --append FORWARD --in-interface bond0 -j ACCEPT Iptables NAT FW (Without Full NAT, Just Insert) Dec 05, 2008 · By using iptables and its masquerade feature, it is possible to forward all traffic to the old server to the new IP. This tutorial will show which command lines are required to make this possible. In this article, it is assumed that you do not have iptables running, or at least no nat table rules for chain PREROUTING and POSTROUTING .
iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE iptables --append FORWARD --in-interface bond0 -j ACCEPT Iptables NAT FW (Without Full NAT, Just Insert)
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE The “liberal” form is better for temporary connections: MASQUERADE automatically chooses address