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Page 81 / 172 Scroll up to view Page 76 - 80
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
Advanced Configuration of the Router
7-9
July 2004 202-10036-01
Setting the MTU Size
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 Bytes,
1492 Bytes for PPPoE connections, or 1436 for PPTP connections. For some ISPs you may need to
reduce the MTU. But this is rarely required, and should not be done unless you are sure it is
necessary for your ISP connection.
Any packets sent through the router 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, enter a new size between 64 and 1500.
2.
Click Apply to save the new configuration.
Page 82 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
7-10
Advanced Configuration of the Router
July 2004 202-10036-01
Using the LAN IP Setup Options
The second feature category under the Advanced heading is LAN IP Setup. This menu allows
configuration of LAN IP services such as DHCP and RIP. From the Main Menu of the browser
interface, under Advanced, click on LAN IP Setup to view the LAN IP Setup menu, shown below.
Figure 7-6:
LAN IP Setup Menu
Configuring LAN TCP/IP Setup Parameters
The router is shipped preconfigured to use private IP addresses on the LAN side, and to act.as a
DHCP server. The router’s default LAN IP configuration is:
•
LAN IP addresses—192.168.0.1
•
Subnet mask—255.255.255.0
Page 83 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
Advanced Configuration of the Router
7-11
July 2004 202-10036-01
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.
The LAN IP parameters are:
•
IP Address
This is the LAN IP address of the router.
•
IP Subnet Mask
This is the LAN Subnet Mask of the router. 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 router sends and receives RIP packets.
Both is the default.
—
When set to Both or Out Only, the router 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. RIP-2B uses subnet broadcasting.
Note:
If you change the LAN IP address of the router 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 84 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
7-12
Advanced Configuration of the Router
July 2004 202-10036-01
Using the Router as a DHCP server
By default, the router 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 router. IP
addresses will be assigned to the attached computers 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 router 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.
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 router’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 router 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 (the router’s LAN IP address)
•
Primary DNS Server (if you entered a Primary DNS address in the Basic Settings menu;
otherwise, the router’s LAN IP address)
•
Secondary DNS Server (if you entered a Secondary DNS address in the Basic Settings menu
Using Address Reservation
When you specify a reserved IP address for a computer on the LAN, that computer will always
receive the same IP address each time it access the router’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.
Page 85 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
Advanced Configuration of the Router
7-13
July 2004 202-10036-01
2.
In the IP Address box, type the IP address to assign to the computer 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 computer or server.
(Tip: If the computer 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 computer contacts the
router's DHCP server. Reboot the computer 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.
Using a Dynamic DNS Service
If your network has a permanently assigned IP address, you can register a domain name and have
that name linked with your IP address by public Domain Name Servers (DNS). However, if your
Internet account uses a dynamically assigned IP address, you will not know in advance what your
IP address will be, and the address can change frequently. In this case, you can use a commercial
dynamic DNS service, who will allow you to register your domain to their IP address, and will
forward traffic directed at your domain to your frequently-changing IP address.
The router contains a client that can connect to many popular dynamic DNS services. You can
select one of these services and obtain an account with them. Then, whenever your ISP-assigned
IP address changes, your router will automatically contact your dynamic DNS service provider,
log in to your account, and register your new IP address.
From the Main Menu of the browser interface, under Advanced, click on Dynamic DNS. To
configure Dynamic DNS:
Note:
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x),
the dynamic DNS service will not work because private addresses will not be routed on
the Internet.

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