sudo iptables -t nat -A POSTROUTING -d 239.0.2.4 -o wlan0 -j DNAT --to 192.168.1.3 My problem is that a relay of my rtsp local server accepts only a multicast ip-address but I would that the packets are sent with a classical ip-address. Thanks
-A POSTROUTING : Append a rule to the POSTROUTING chain (-A stands for "append").-o eth1 : this rule is valid for packets that leave on the second network interface (-o stands for "output")-j MASQUERADE : the action that should take place is to 'masquerade' packets, i.e. replacing the sender's address by the router's address. pre-routing function of Cisco Unified Contact Center Enterprise makes a routing decision for each call while it is still in the IP network or PSTN and before it is sent to an agent or other target-enabling the system to segment customers and deliver each contact to the best available resource the first time. Always remember that in PREROUTING/POSTROUTING i.e. NAT table the ACCEPT/DROP/REJECT etc targets of the default FILTER table will not work. The NAT table is only used for taking routing decisions. You should use PREROUTING when taking any routing decisions i.e. the decisions which are needed to be taken before the packet will start traversing POSTROUTING: Routing decision has been made. Packets enter this chain just before handing them off to the hardware. A chain does not exist by itself; it belongs to a table. There are three tables: nat, filter, and mangle. Unless preceded by the option -t, an iptables command concerns the filter table by default. iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE The “liberal” form is better for temporary connections: MASQUERADE automatically chooses address
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT I am now trying to figure out what I need to do in order for DNS resolution to work on my private LAN.
With that, a simple iptables -L POSTROUTING -t mangle -v gives you a perfect counter for each flow. And as mentioned before it does also account the traffic of RELATED connections in the category of the parent connection. iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE service iptables save service iptables restart. Note: check if iptables is set to start during boot up. Or check the status of your iptables service: chkconfig –list iptables. If level 5 is on then it's ok othewise start the service at level 5 or level 2345.
The rule uses the NAT packet matching table (-t nat) and specifies the built-in POSTROUTING chain for NAT (-A POSTROUTING) on the firewall's external networking device (-o eth0). POSTROUTING allows packets to be altered as they are leaving the firewall's external device.
To run the command, log in to the NSX Edge CLI and enter basic mode. For more information, see the NSX Command Line Interface Reference.For example: show packet drops vShield Edge Packet Drop Stats: Firewall Drop Counters ===== Ipv4 Rules ===== Chain - INPUT rid pkts bytes target prot opt in out source destination 0 119 30517 DROP all -- * * 0.0.0.0/0 0.0.0.0/0 state INVALID 0 0 0 DROP all Configuring CentOS Linux server as a router. Software. Software used in this article: CentOS 6.7; iptables 1.4.7; What is Iptables? Iptables is a user-space application program that allows a users to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores. Sep 17, 2018 · sudo iptables -t nat -A POSTROUTING -o enp0s9 -p udp --dport 123 -j MASQUERADE OR sudo iptables -t nat -A POSTROUTING -o enp0s9 -p udp --dport 123 -j SNAT --to-source 192.168.2.125 NOTE: One mistake that is easy to make in this step is assuming the