Multitech PROXYSERVER MTPSR1-120 User's Guide Page 26

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Dual Ethernet ProxyServer User Guide
Configuration 2 - Existing Dual-LAN with Router
Another typical configuration ties the private LAN (LAN 1) to an existing Internet Services
Network, which already provides Internet services. This configuration provides firewall and
gateway security for the LAN users, and supports Internet access restrictions based on IP
address, client protocols, or a list of forbidden sites.
Internet Services
Network
MTPSR1-120 Firewall
IP Address 192.168.0.101
Mask 255.255.255.0
Internet
Novell Server
IP Address
192.168.0.102
Windows NT Server
IP Address
192.168.0.103
Mail Server
IP Address
192.168.0.104
Workstation
IP Address
192.168.0.105
Workstation
IP Address
192.168.0.106
Workstation
IP Address
192.168.0.107
HUB
TM
TM
LAN 1
Private
LAN 2
Public
Video Server
IP Address
204.26.12.40
Web Server
IP Address
204.26.12.20
FTP Server
IP Address
204.26.12.30
HUB
Private LAN
Router
IP address
204.26.12.10
Internet LAN
IP Address 204.26.12.9
Mask 255.255.255.0
Figure 4-2. Existing Dual-LAN with Router Configuration
In the configuration shown in Figure 4-2, the ProxyServer is connected to the private LAN via the
LAN 1 connection of the back of the ProxyServer. The Internet Services Network, or public LAN,
is connected to the LAN 2 connector on the back of the unit. Connection to the Internet is then
provided by the existing router connected to the Internet Services Network.
During the loading of the Firewall software, the Secured LAN Port Parameters group (in the IP
Setup dialog box) was configured to include an IP Address of 192.168.0.101, and a default Net
Mask of 255.255.2.55.0 for the private LAN (LAN 1). The Internet LAN Port Parameters group
was configured with the DHCP Client option disabled, and the static IP Address of 204.26.12.10
was entered. This address is the existing static IP address that had already been assigned to the
Internet Services Network router. A Net Mask of 255.255.255.0 was then entered to complete the
configuration of the public LAN (LAN 2).
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