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Page 51 / 123 Scroll up to view Page 46 - 50
TW100-BRV304 User Guide
48
Virtual Servers
This feature allows you to make Servers on your LAN accessible to Internet users. Normally,
Internet users would not be able to access a server on your LAN because:
•
Your Server does not have a valid external IP Address.
•
Attempts to connect to devices on your LAN are blocked by the firewall in this device.
The "Virtual Server" feature solves these problems and allows Internet users to connect to your
servers, as illustrated below.
Figure 31: Virtual Servers
IP Address seen by Internet Users
Note that, in this illustration, both Internet users are connecting to the same IP Address, but
using different protocols.
To Internet users, all virtual Servers on your LAN have the same IP Address.
This IP Address is allocated by your ISP.
This address should be static, rather than dynamic, to make it easier for Internet users to
connect to your Servers.
However, you can use the
DDNS (Dynamic DNS)
feature to allow users to connect to your
Virtual Servers using a URL, instead of an IP Address.
Page 52 / 123
Internet Features
49
Using the DMZ port for Virtual Servers
You should connect your Virtual Servers to the DMZ port, for the following reasons:
•
Traffic passing between the DMZ and LAN passes through the firewall. The firewall will
protect your LAN if your Server is compromised and used to launch an attack on your
LAN.
•
For each enabled Virtual Server, a firewall rule to allow incoming traffic from the Internet
(WAN) to the DMZ is automatically created. If the Server is connected to the LAN (hub)
ports, you must add the firewall rule manually.
Note that the DMZ port is a normal port, not an "uplink" port. If connecting to a hub, connect
to the standard port on the hub.
Virtual Servers Screen
The
Virtual Servers
screen is reached by the
Virtual Servers
link on the
Internet
menu. An
example screen is shown below.
Figure 32: Virtual Servers Screen
This screen lists a number of pre-defined Servers,. providing a quick and convenient method to
set up the common server types.
Data - Virtual Servers Screen
Servers
This lists a number of pre-defined Servers, plus any Servers you
have defined. Details of the selected Server are shown in the
"Properties" area.
Enable
Use this to Enable or Disable support for this Server, as required.
•
If Enabled, any incoming connections will be forwarded to the
selected PC.
•
If Disabled, any incoming connection attempts will be blocked.
PC (Server)
Select the PC for this Server. The PC must be running the appro-
priate Server software.
Page 53 / 123
TW100-BRV304 User Guide
50
Defining your own Virtual Servers
If the type of Server you wish to use is not listed on the
Virtual Servers
screen, you can use the
Firewall Rules to allow particular incoming traffic and forward it to a specified PC (Server).
Connecting to the Virtual Servers
Once configured, anyone on the Internet can connect to your Virtual Servers. They must use
the Internet IP Address (the IP Address allocated to you by your ISP).
e.g.
It is more convenient if you are using a Fixed IP Address from your ISP, rather than Dynamic.
However, you can use the
Dynamic DNS
feature, described in the following section, to allow
users to connect to your Virtual Servers using a URL, rather than an IP Address.
Options
This screen allows advanced users to enter or change a number of settings. For normal opera-
tion, there is no need to use this screen or change any settings.
Figure 33: Options Screen
Data - Options Screen
IP Address
Enter the IP Address of the DNS (Domain Name Servers) here. These
DNS will be used only if the primary DNS is unavailable.
Page 54 / 123
Internet Features
51
MTU size
MTU (Maximum Transmission Unit) value should only be changed if
advised to do so by Technical Support.
•
Enter a value between 1 and 1500.
•
This device will still auto-negotiate with the remote server, to set
the MTU size. The smaller of the 2 values (auto-negotiated, or en-
tered here) will be used.
•
For direct connections (not PPPoE or PPTP), the MTU used is
always 1500.
Page 55 / 123
52
Chapter 7
Security Configuration
This Chapter explains the settings available via the security configuration
section of the "Security" menu.
Overview
The following advanced configurations are provided.
•
Admin Login
•
Access Control
•
Firewall Rules
•
Logs
•
Security Options
•
Scheduling
•
Services
Admin Login
The Admin Login screen allows you to assign a user name and password to the TW100-
BRV304 .
Figure 34: Admin Login Screen
1.
The default login name is "admin". Change this to the desired value.
2.
The default password is blank (no password). Enter the desired password in the
New
Password
and
Verify Password
fields.
3.
Save your changes.
You will see a login prompt when you connect to the TW100-BRV304, as shown below.
7

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