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̈ Chapter 4: Management LANCOM Reference Manual LCOS 3.50
43
Management
The address range for translation must be at minimum as large as the
source address range.
Please notice that the N:N mapping functions are only effective when
the firewall has been activated. (’Firewall/QoS enabled’ →page 121)!
Additional configuration hints
By setting up address translation in the NAT table, the networks and worksta-
tions become only visible under another address at first in the higher network
compound. But for a seamless routing of data between the networks some
further settings are still necessary:
̈ Entries in the routing tables for packets with new addresses to find the
way to their destination.
̈ DNS forwarding entries, in order that inquiries about certain devices in the
respective other networks can be resolved into mapped IP addresses
(’DNS forwarding’ →page 279).
̈ The firewall rules of the gateways must be adjusted such that (if neces-
sary) authorized stations resp. networks from the outside are permitted to
set up connections.
̈ VPN rules for loopback addresses in order to transmit the newly assigned
IP addresses through an according VPN tunnel.
The IP address translation takes place in the LANCOM between fire-
wall and IP router on one hand, and the VPN module on the other
hand. All rules related to the own network use therefore the “unmap-