3Com OfficeConnect 3C857, User Manual

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Firewall 61
6 Select an idle time from the Maximum Idle Time drop-down list.
This value will correspond to the amount of idle time (no Internet activity)
that will pass before the Gateway automatically ends your PPTP session.
7 IP settings must be used when establishing a PPTP connection. Fill in the
Initial IP Address and the Initial Subnet Mask fields if your ISP has
provided you with these settings. Alternatively, if the PPTP server is
located in your DSL modem, click
Suggest to select an IP address on the
same subnet as the PPTP server.
Firewall
On the main frame of the Firewall setup screen is a menu with four tabs:
Virtual Servers, Special Applications, PCs Privileges, and Security.
Virtual Servers Selecting the Firewall option on the main menu displays the Virtual
Servers setup screen. ( Figure 46 )
Virtual DMZ
Figure 46 Virtual Servers Screen
DMZ (De-Militarized Zone) Host is a computer without the protection of
the firewall. This feature allows a single computer to be exposed to
unrestricted 2-way communication from outside of your network. This
feature should be used only if the Virtual Server or Special Applications
options do not provide the level of access needed for certain applications.
To configure one of your computers as a DMZ host, enter the last digit(s)
of the IP address of the computer in the
IP Address of DMZ Host text box,
and then click Apply .