Lancom Systems 821 - Manual (Page 41)

LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN
̈ Chapter 3: Basic configuration
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ቨ The basic setup wizard reports that all the necessary information has been
provided. You can end the wizard with Go on.
3.4 TCP/IP settings to workstation PCs
The correct addressing of all devices within a LAN is extremely important for
TCP/IP networks. In addition, all computers must know the IP addresses of two
central points in the LAN:
̈
Default gateway – receives all packets that are not addressed to comput-
ers within the local network.
̈ DNS server – translates network names (www.lancom.de) or names of
computers (www.lancom.de) to actual IP addresses.
The LANCOM can perform the functions of both a default gateway and a DNS
server. In addition, as a DHCP server it can also automatically assign valid IP
addresses to all of the computers in the LAN.
The correct TCP/IP configuration of the PCs in the LAN depends on the method
used to assign IP addresses within the LAN:
̈ IP address assignment via the LANCOM (default)
In this operating mode the LANCOM not only assigns IP addresses to the
PCs in the LAN, it also uses DHCP to specify its own IP address as that of
the default gateway and DNS server. The PCs must therefore be config-
ured so that they automatically obtain their own IP address and the IP
addresses of the standard gateway and DNS server (via DHCP).
̈ IP address assignment via a separate DHCP server
The workstation PCs must be configured so that they automatically obtain
their own IP address and the IP addresses of the standard gateway and
DNS server (via DHCP). The IP address of the LANCOM must be stored on
the DHCP server so that the DHCP server transmits it to the PCs in the LAN
as the standard gateway. In addition, the DHCP server should also specify
the LANCOM as a DNS server.
̈
Manual IP address assignment
If the IP addresses in the network are assigned static ally, then for each PC
the IP address of the LANCOM must be set in the TCP/IP configuration as
the standard gateway and as a DNS server.
For further information and help on the TCP/IP settings of your
LANCOM, please see the reference manual. For more information on