Wireshark Capture File : ROUTER 5, where the destination IP is the gateway i.e 11.2.1.2 Wireshark Capture File: WIRED NODE 1, where the destination IP is the gateway i.e 11.1.1.1 The flow graph for UDP traffic between Wired Node 1 and Wired Node 3, based on packet capture done at all the intermediate devices is shown below: The IP header of one of the UDP packets is shown below: In the case of Application 1 which involves Wired Node 1 and Wired Node 2 which are part of the same network, communication happens using the Private IP Address itself, without the need for NAT and Public IP Addresses. We have configured UDP traffic between two nodes within the same network and two nodes that communicate across the network. Let us consider the following network configuration: NAT can be configured to advertise to the outside world only one address for the entire network.Įxamples Use Cases (Experiment file is attached which can be imported - NetSim v11,1) If more than one exit point exists, each NAT must have the same translation table. When a packet enters the domain, NAT translates the globally unique destination address into a local address. When a packet leaves the domain, NAT translates the locally significant source address into a globally unique address. In a typical environment, NAT is configured at the exit device between a stub domain (inside the network) and the backbone. A device that is configured with NAT will have at least one interface to the inside network and one to the outside network.

NAT helps to improve security and decrease the number of IP addresses an organization needs. NAT (Network Address Translation or Network Address Translator) is the virtualization of Internet Protocol (IP) addresses.

Hence users would notice that end destination IP is logged in Wire-shark / packet trace If static routes are configured, then that is given higher preference over NAT/Public IP functions.

When forwarding packets within a LAN, Public IP is obviously not considered.The public IP of a node is the IP address of the interface of the router to which it is connected.

The destination IP address field (can be seen when logged in Wireshark/packet trace) changes per Public IP/NAT rules.

The IP Addresses of the end nodes are assumed to be private.

The Source IP logged in Wireshark and packet trace is always the IP of the source.

Ip address wireshark