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20
Chapter 5: Configuring the ADSL Gateway
The Setup Tab
ADSL Gateway
The Advanced Routing Tab
The
Advanced Routing
screen allows you to configure the NAT, dynamic routing, and static routing settings.
Advanced Routing
•
Operating Mode. In this section, you will configure the Gateway’s general routing settings.
•
NAT. NAT is a security feature that is enabled by default. It enables the Gateway to translate IP addresses
of your local area network to a different IP address for the Internet. To disable NAT, click the
Disabled
radio button.
•
Dynamic Routing. With Dynamic Routing you can enable the Gateway to automatically adjust to physical
changes in the network’s layout. Using RIP, the Gateway determines the network packets’ route based on the
fewest number of hops between the source and the destination. The RIP protocol regularly broadcasts routing
information to other Gateways on the network.
•
RIP. If you have multiple routers, you may want to use the Routing Information Protocol (RIP) so the routers
can exchange routing information with each other. To use RIP, select the
Enabled
radio button. Otherwise,
keep the default,
Disabled
.
•
Transmit RIP Version. To transmit RIP messages, select the protocol you want:
RIP1, RIP1-Compatible
(RIP1 broadcasts and RIP2 multicasts), or RIP2
. If you don’t want to transmit RIP messages, select
None
.
•
Receive RIP Version. To receive RIP messages, select the protocol you want:
RIP1
or
RIP2
. If you don’t
want to receive RIP messages, select
None
.
•
Static Routing. If the Gateway is connected to more than one network, it may be necessary to set up a static
route between them. A static route is a pre-determined pathway that network information must travel to
reach a specific host or network. To create a static route, change the following settings:
•
Select set number. Select the number of the static route from the drop-down menu. The Gateway
supports up to 20 static route entries. If you need to delete a route, then select the entry and click the
Delete This Entry
button.
•
Destination IP Address. The Destination IP Address is the address of the remote network or host to which
you want to assign a static route. Enter the IP address of the host for which you wish to create a static
route. If you are building a route to an entire network, be sure that the network portion of the IP address is
set to 0.
Figure 5-14: Advanced Routing
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21
Chapter 5: Configuring the ADSL Gateway
The Setup Tab
ADSL Gateway
•
Subnet Mask. Enter the Subnet Mask (also known as the Network Mask), which determines which portion
of an IP address is the network portion, and which portion is the host portion.
•
Gateway. Enter the IP address of the gateway device that allows for contact between the Gateway and the
remote network or host.
•
Hop Count. Hop Count is the number of hops to each node until the destination is reached (16 hops
maximum). Enter the Hop Count in the field provided.
•
Show Routing Table. Click the
Show Routing Table
button to open a screen displaying how data is routed
through your local network. For each route, the Destination LAN IP address, Subnet Mask, Gateway, and
Interface are displayed. Click the
Refresh
button to update the information. Click the
Close
button to return to
the previous screen.
PVC Routing Policy
If you have multiple PVCs, click the
PVC Routing Setting
button to configure which outgoing traffic will be routed
over which PVC. A window titled PVC Selection Table will appear.
Please select Active Connection. Open this drop-down list and specify the PVC for which you will select traffic.
Traffic can be selected on the basis of any of the following criteria, alone or in combination:
•
Destination (IP address and address mask)
•
Source (IP address and address mask, or MAC address)
•
Transport protocol (TCP, UDP, or All)
•
Destination port and/or source port (if protocol is set to TCP or UDP)
•
Presence of a specified IEEE 802.1D user priority marker
•
IEEE 802.3 Type/Length value (the value in the 13th and 14th octets of an Ethernet frame)
•
Presence of a specified IEEE 802.1Q virtual LAN (VLAN) ID
•
Packet length between specified minimum and maximum numbers of octets.
•
Presence of a specified DSCP (Diffserv Code Point) value (one kind of QoS marker)
Figure 5-15: Routing Table
Figure 5-16: PVC Routing
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22
Chapter 5: Configuring the ADSL Gateway
The Setup Tab
ADSL Gateway
Apply. To enable the selection criteria on one line of the table, click that line’s Apply box so a check appears in it.
To disable the line’s criteria, click the box to clear.
When you have finished making changes in this window, click the
Save
button to save the changes, or click the
Cancel
button to undo your changes. Then click
Close
. You will be returned to the Advanced Routing panel. Click
the
Save Settings
button to save your changes, or click the
Cancel Changes
button to undo your changes.
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23
Chapter 5: Configuring the ADSL Gateway
The Security Tab
ADSL Gateway
The Security Tab
The Security tab gives you access to firewall and VPN (virtual private network) settings.
The Firewall Tab
This panel shows firewall and filter settings. Use these features to enhance the security of your network.
Firewall
You can enable or disable the firewall, select filters to block specific Internet data types, and block anonymous
Internet requests.
To use the firewall, click
Enable
. If you do not want to use the firewall, click
Disable
.
Additional Filters
•
Filter Proxy. Use of WAN proxy servers may compromise the Gateway's security. Denying Filter Proxy will
disable access to any WAN proxy servers. To enable proxy filtering, click the checkbox.
•
Filter Cookies. A cookie is data stored on your computer and used by Internet sites when you interact with
them. To enable cookie filtering, click the checkbox.
•
Filter Java Applets. Java is a programming language for websites. If you deny Java Applets, you run the risk
of not having access to Internet sites created using this programming language. To enable Java Applet
filtering, click the checkbox.
•
Filter ActiveX. ActiveX is a programming language for websites. If you deny ActiveX, you run the risk of not
having access to Internet sites created using this programming language. To enable ActiveX filtering, click the
checkbox.
Block WAN Requests
•
Block Anonymous Internet Requests. This keeps your network from being “pinged” or detected and
reinforces your network security by hiding your network ports, so it is more difficult for intruders to discover
your network. Select
Block Anonymous Internet Requests
to block anonymous Internet requests or de-
select it
to allow anonymous Internet requests.
If you want to see activity logs for your security measures, then click the
View Logs
button. Click the
Clear
button to clear the log information. Click the
pageRefresh
button to refresh the information. Click the
Previous
Figure 5-18: Firewall Log
Figure 5-17: Firewall
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24
Chapter 5: Configuring the ADSL Gateway
The Security Tab
ADSL Gateway
Page
button to go to the previous page of information. Click the
Next Page
button to move to the next page of
information.
When finished making your changes on this tab, click the
Save Settings
button to save these changes, or click
the
Cancel Changes
button to undo your changes.
The VPN Tab
This panel shows VPN (virtual private network) settings. You can disable or enable passthrough for four kinds of
VPNs. You can also set up IPSec (Internet Protocol Security) VPN tunnels for secure remote access.
VPN Passthrough
Virtual Private Networking (VPN) is a security measure that basically creates a secure connection between two
remote locations. Configure these settings so the Gateway will permit VPN tunnels to pass through.
•
IPSec Passthrough. Internet Protocol Security (IPSec) is a suite of protocols used to implement secure
exchange of packets at the IP layer. To allow IPSec Passthrough, click the
Enable
button. To disable IPSec
Passthrough, click the
Disable
button.
•
PPPoE Passthrough. PPPoE Passthrough allows your PC(s) to use the PPPoE client software provided by your
ISP. Some ISPs may request that you use this feature on the Gateway. To allow PPPoE Passthrough, click the
Enable
button. To disable PPPoE Passthrough, click the
Disable
button.
•
PPTP Passthrough. Point-to-Point Tunneling Protocol Passthrough is the method used to enable VPN sessions
to a Windows NT 4.0 or 2000 server. To allow PPTP Passthrough, click the
Enable
button. To disable PPTP
Passthrough, click the
Disable
button.
•
L2TP Passthrough. Layering 2 Tunneling Protocol Passthrough is an extension of the Point-to-Point Tunneling
Protocol (PPTP) used to enable the operation of a VPN over the Internet.To allow L2TP Passthrough, click the
Enable
button. To disable L2TP Passthrough, click the
Disable
button.
IPSec VPN Tunnel
Use this section of the VPN panel to set up, enable, and disable secure IPSec tunnels between the Gateway and
remote IPSec gateways and clients. Note that you must have a working ADSL connection to complete the settings
in this section.
•
Select Tunnel Entry: You can enable up to five IPSec tunnels. Each has a number and a name. Use this
control to select the one you want to enable, disable, edit, or delete.
Figure 5-19: The VPN Panel
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