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Page 86 / 154 Scroll up to view Page 81 - 85
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
6-2
Advanced Configuration
Incoming traffic from the Internet is normally discarded by the gateway unless the traffic is a
response to one of your local computers or a service that you have configured in the Ports menu.
Instead of discarding this traffic, you can have it forwarded to one computer on your network. This
computer is called the Default DMZ Server.
Procedure 6-1:
Configuring A Default DMZ Server.
To assign a computer or server to be a Default DMZ server, follow these steps:
1.
Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User
Name of
admin
, default password of
password
, or using whatever Password and LAN
address you have chosen for the gateway.
2.
From the Main Menu, under Security, click the Rules link to view the menu, shown in
Figure 6-1
Figure 6-1: Security Rules Menu
3.
Click Default DMZ Server.
4.
Type the IP address for that server.
5.
Click Apply to save your changes.
Respond to Ping on Internet WAN Port
If you want the gateway to respond to a 'ping' from the Internet, click the ‘Respond to Ping on
Internet WAN Port’ check box. This should only be used as a diagnostic tool, since it allows your
gateway to be discovered. Don't check this box unless you have a specific reason to do so.
Page 87 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
Advanced Configuration
6-3
Configuring LAN IP Settings
The LAN IP Setup menu allows configuration of LAN IP services such as DHCP and RIP. These
features can be found under the Advanced heading in the Main Menu of the browser interface.
LAN TCP/IP Setup
The gateway is shipped preconfigured to use private IP addresses on the LAN side, and to act as a
DHCP server. The gateway’s default LAN IP configuration is:
•
LAN IP addresses—192.168.0.1
•
Subnet mask—255.255.255.0
These addresses are part of the IETF-designated private address range for use in private networks,
and should be suitable in most applications. If your network has a requirement to use a different IP
addressing scheme, you can make those changes in this menu.
Figure 6-2: LAN IP Setup Menu
Page 88 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
6-4
Advanced Configuration
The LAN TCP/IP Setup parameters are:
•
IP Address
This is the LAN IP address of the gateway.
•
IP Subnet Mask
This is the LAN Subnet Mask of the gateway. Combined with the IP address, the IP Subnet
Mask allows a device to know which other addresses are local to it, and which must be reached
through a gateway or router.
•
RIP Direction
RIP (Router Information Protocol) allows a router to exchange routing information with other
routers. The RIP Direction selection controls how the gateway sends and receives RIP packets.
Both is the default.
—
When set to Both or Out Only, the gateway will broadcast its routing table periodically.
—
When set to Both or In Only, it will incorporate the RIP information that it receives.
—
When set to None, it will not send any RIP packets and will ignore any RIP packets
received.
•
RIP Version
This controls the format and the broadcasting method of the RIP packets that the router sends.
It recognizes both formats when receiving. By default, this is set for RIP-1.
—
RIP-1 is universally supported. RIP-1 is probably adequate for most networks, unless you
have an unusual network setup.
—
RIP-2 carries more information. Both RIP-2B and RIP-2M send the routing data in RIP-2
format.
—
RIP-2B uses subnet broadcasting.
—
RIP-2M uses multicasting.
MTU Size
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 Bytes. For
PPPoE, the gateway adjusts the MTU size automatically. Changing this is rarely required, and
should not be done unless you are sure it is necessary for your ISP connection.
Note:
If you change the LAN IP address of the gateway while connected through the
browser, you will be disconnected. You must then open a new connection to the new IP
address and log in again.
Page 89 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
Advanced Configuration
6-5
Any packets sent through the gateway that are larger than the configured MTU size will be
repackaged into smaller packets to meet the MTU requirement. To change the MTU size:
1.
Under MTU Size, select Custom.
2.
Enter a new size between 64 and 1500. For PPPoE, use 1492.
3.
Click Apply to save the new configuration.
DHCP
By default, the gateway will function as a DHCP (Dynamic Host Configuration Protocol) server,
allowing it to assign IP, DNS server, and default gateway addresses to all computers connected to
the router's LAN. The assigned default gateway address is the LAN address of the gateway. IP
addresses will be assigned to the attached PCs from a pool of addresses specified in this menu.
Each pool address is tested before it is assigned to avoid duplicate addresses on the LAN.
For most applications, the default DHCP and TCP/IP settings of the gateway are satisfactory. See
“IP Configuration by DHCP“ on page B-10
” for an explanation of DHCP and information about
how to assign IP addresses for your network.
Use Gateway as DHCP server
If another device on your network will be the DHCP server, or if you will manually configure the
network settings of all of your computers, clear the ‘Use router as DHCP server’ check box.
Otherwise, leave it checked.
Specify the pool of IP addresses to be assigned by setting the Starting IP Address and Ending IP
Address. These addresses should be part of the same IP address subnet as the gateway’s LAN IP
address. Using the default addressing scheme, you should define a range between 192.168.0.2 and
192.168.0.253, although you may wish to save part of the range for devices with fixed addresses.
The gateway will deliver the following parameters to any LAN device that requests DHCP:
•
An IP Address from the range you have defined
•
Subnet Mask
•
Gateway IP Address is the gateway’s LAN IP address
•
Primary DNS Server, if you entered a Primary DNS address in the Basic Settings menu;
otherwise, the gateway’s LAN IP address
•
Secondary DNS Server, if you entered a Secondary DNS address in the Basic Settings menu
Page 90 / 154
Reference Manual for the Model DG824M Wireless ADSL Modem Gateway
6-6
Advanced Configuration
•
WINS Server, s
hort for
Windows Internet Naming Service Server,
determines the IP
address associated with a particular Windows computer. A WINS server records and
reports a list of names and IP address of Windows PCs on its local network. If you
connect to a remote network that contains a WINS server, enter the server’s IP address
here. This allows your PCs to browse the network using the Network Neighborhood
feature of Windows.
Reserved IP addresses
When you specify a reserved IP address for a PC on the LAN, that PC will always receive the
same IP address each time it access the gateway’s DHCP server. Reserved IP addresses should be
assigned to servers that require permanent IP settings.
To reserve an IP address:
1.
Click the
Add
button.
2.
In the IP Address box, type the IP address to assign to the PC or server.
Choose an IP address from the router’s LAN subnet, such as 192.168.0.X.
3.
Type the MAC Address of the PC or server.
Tip:
If the PC is already present on your network, you can copy its MAC address from the
Attached Devices menu and paste it here.
4.
Click
Apply
to enter the reserved address into the table.
Note:
The reserved address will not be assigned until the next time the PC contacts the router's
DHCP server. Reboot the PC or access its IP configuration and force a DHCP release and
renew.
To edit or delete a reserved address entry:
1.
Click the button next to the reserved address you want to edit or delete.
2.
Click Edit or Delete.
Procedure 6-1:
Configure LAN TCP/IP Setup
1.
Log in to the gateway at its default LAN address of http://192.168.0.1 with its default User
Name of
admin
, default password of
password
, or using whatever User Name, Password and
LAN address you have chosen for the gateway.

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