Nat/Napt - Siemens SCALANCE XM-400 Configuration Manual

Technical basics

4.9 NAT/NAPT

Example
In this example the source sends a multicast to the connected router. The router sends this
information to the rendezvous point.
The recipient sends an IGPM Join to its IGMP querier and designated router. The DR forwards
the request to the RP.
Based on the routing table, the shortest path is selected for the multicast.
4.9 NAT/NAPT
Note
NAT/NAPT is possible only on layer 3 of the ISO/OSI reference model. To use the NAT
function, the networks must use the IP protocol.
When using the ISO protocol that operates at layer 2, it is not possible to use NAT.
In Network Address Translation (NAT) IP subnets are divided into "Inside" and "Outside". The
division is from the perspective of a NAT interface. All networks reachable via the NAT interface
68
VLAN 1
Recipient
IGMP querier and DR
VLAN 2 VLAN 3
Rendezvous point
VLAN 4
Unicast routing topology
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
Source