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LANCOM Reference Manual LCOS 3.50 ̈ Chapter 7: Routing and WAN connections
86
Routing and WAN
connections
of the mapping address. Therefore, in an assignment of 10.0.0.0/
255.255.255.0 to 192.168.1.0, a server of the LAN with IP address
10.1.1.99 will get assigned the mapping address 192.168.1.99.
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
“unmapped” original addresses. The entries of the remote network