NETMAP with SCALANCE M-800
6.1 NETMAP for the local network
SCALANCE M-800 Getting Started
206 Getting Started, 06/2015, C79000-G8976-C337-04
NETMAP for the local network
With NETMAP of the local network, the source address ① e.g. 192.168.20.20 is translated.
In this translation, the subnet part of the IP address is changed and the host part remains. In
the example, the subnet part is 192.168.20.0. This subnet part is replaced by 192.168.200.0.
The source IP address is translated by the M876
② and forwarded to the destination ③.
With incoming queries
③, the destination IP address 192.168.200.0 is replaced by
192.168.20.0. The destination IP address is translated by the M876
② and forwarded to the
destination
①. Only the NETMAP rules for the direction of the query are necessary. The
NETMAP rules for the replies are added implicitly. When PC1 sends a query to PC2, the
reply is translated based on it. This, however, does not apply to queries from PC2 to PC1.
For this, the following NETMAP rules are created on the M876 (initiator):
Local network > remote network:
The source IP subnet 192.168.20.0/24 is replaced by 192.168.200.0/24.
Remote network > local network:
The destination IP subnet 192.168.200.0/24 is replaced by 192.168.20.0/24
The two devices also communicate via a VPN tunnel.
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