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Host & Group
List
This table shows the current bindings.
5.2
Routing
This section is only relevant if your LAN has other Routers or Gateways.
y
If you don't have other Routers or Gateways on your LAN, you can ignore the
Static
Routing
page completely.
y
If your LAN has other Gateways and Routers, you must configure the Static Routing
screen as described below. You also need to configure the other Routers.
Figure: Routing
Note:
If there is an entries in the Routing table with an Index of zero (0), these are System entries.
You cannot modify or delete these entries.
Settings – Routing
Dynamic
Routing
•
RIP v2
– RIP is a dynamic routing protocol which is used to
direct traffic over the network. Disable it if you don't need to
use it.
•
LAN and WAN1
– If enabled, any WAN or LAN can execute
RIP function.
Static Routing
If there is more than one router on a network, this Routing table
must be configured because the router needs to know what packet
goes to which router. A routing table entry is required for each LAN
segment on the network
•
Network Address
– The address of the destination network
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segment.
•
Netmask
–The subnet mask used to select the bits from an IP
Address that corresponds to the subnet.
•
Gateway
–The router that the packets destined for the subnet
with
Network Address
will be forwarded to.
•
Interface
– The device's port that the packets destined for the
subnet with Network Address will be passed through.
•
Metric
– The number of routers that must be traversed to
reach the destination network segment
Routing List
List of static route that you configured previously.
Configuring Other Routers on your LAN
All traffic for devices not on the local LAN must be forwarded to the Router, so that they
can be forwarded to the Internet. This is done by configuring other Routers to use the
Router as the Default Route or Default Gateway, as illustrated by the example below.
Static Routing – Example
Router B
(192.168.2.90)
(192.168.3.70)
Router A
Segment 0
Segment 2
Segment 1
(192.168.1.xx)
(192.168.2.xx)
(192.168.1.100)
(192.168.1.1)
(192.168.3.xx)
(192.168.2.80)
Figure: Routing Example
y
For the Router Gateway's Routing Table
For the LAN shown above, with 2 routers and 3 LAN segments, the Router requires 2
entries as follows.
Entry 1 (Segment 1)
Destination IP Address
192.168.2.0
Network Mask
255.255.255.0
Gateway IP Address
192.168.1.100
Interface
LAN
Metric
2
Entry 2 (Segment 2)
Destination IP Address
192.168.3.0
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Network Mask
255.255.255.0
(Standard Class C)
Gateway IP Address
192.168.1.100
Interface
LAN
Metric
3
y
For Router A's Default Route
Destination IP Address
0.0.0.0
Network Mask
0.0.0.0
Gateway IP Address
192.168.1.1
Metric
2
y
For Router B's Default Route
Destination IP Address
0.0.0.0
Network Mask
0.0.0.0
Gateway IP Address
192.168.2.80
Interface
LAN
Metric
3
5.3
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:
y
Your Server's IP address is only valid on your LAN, not on the Internet.
y
Attempts to connect to devices on your LAN are blocked by the firewall in the Router.
The "Virtual Server" feature solves these problems and allows Internet users to connect to
your servers, as illustrated below.
Figure: Virtual Servers
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29
Note that, in this illustration, both Internet users are connecting to the same IP Address,
but using different protocols.
Connecting to the Virtual Servers
Once configured, anyone on the Internet can connect to your Virtual Servers. They must
use the Router's Internet IP Address (the IP Address allocated by your ISP).
e.g.:
•
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
Dynamic DNS
feature (explained
later in this chapter) to allow users to connect to your Virtual Servers using a URL,
instead of an IP Address.
e.g.
HTTP://my_domain_name.dyndns.org
FTP://my_domain_name.dyndns.org
Figure: Virtual Server
Settings – Virtual Server
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Virtual Server
Configuration
•
Enable
– To activate or deactivate the current entry.
•
Server Name
– A unique name for identifying the virtual
server.
•
Protocol
– Select the protocol (either TCP or UDP) used
by the server software.
•
IP Address
–
LAN:
Enter the IP address of the server on
the device's LAN side. The hosts used as Virtual Servers
need static IP addresses or reserved IP addresses.
WAN:
The WAN port that the virtual server is bound on.
•
Port Range
–
LAN:
The range of port numbers used by
the server. If only one port number is used, fill the same
number in both starting and ending fields.
WAN:
The
range of port numbers for users in public to access the
virtual server. If only one port number is used, fill the same
number in both starting and ending fields.
•
Allowed Remote IP
– The range of IP addresses that are
allowed to access the virtual server.
Virtual Server List
The Virtual Server List shows details of all Virtual Servers which
have been defined.
5.4
Special Applications
If you use Internet applications which have non-standard connections or port numbers, you
may find that they do not function correctly because they are blocked by the firewall in the
Router. In this case, you can define the application as a "Special Application" in order to
make it work.
Note that the terms "Incoming" and "Outgoing" on this screen refer to traffic from the client
(PC) viewpoint
Figure: Special Applications

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