Reference Manual for the Broadband Voice Adapter TA612V

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Advanced Configuration

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Incoming traffic from the Internet is normally discarded by the router 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.

The WAN Setup menu, shown below lets you configure a Default DMZ Server.

To assign a computer or server to be a Default DMZ server, follow these steps:

1.

Click

WAN Setup

on the Advanced section of the main menu.

2.

Type the IP address for that server. To remove the default DMZ server, replace the IP address

numbers with all zeros.

3.

Click

Apply

to save your settings.

•

Respond to Ping on Internet WAN Port

If you want the router 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 router to be discovered. Don't check this box unless you have a specific reason to do so.

•

Setting the MTU Size

The default MTU size is usually fine. The normal MTU (Maximum Transmit Unit) value for

most Ethernet networks is 1500 Bytes. For some ISPs, particularly some using PPPoE, you

may need to reduce the MTU. This should not be done unless you are sure it is necessary for

your ISP.

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:

Under MTU Size, enter a new size between 64 and 1500. Then, click Apply to save the new

configuration.

Note:

DMZ servers pose a security risk. A computer designated as the default DMZ

server loses much of the protection of the firewall, and is exposed to exploits from the

Internet. If compromised, the DMZ server can be used to attack your network.

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Advanced Configuration

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Using LAN IP Setup Options

The LAN IP Setup feature is under the Advanced heading of the main menu. This feature 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 6-5:

LAN IP Setup Menu

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—192.168.61.1

•

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.

The LAN IP parameters are:

Reference Manual for the Broadband Voice Adapter TA612V

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Advanced Configuration

202-10037-01, March 2005

•

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.

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.

Note:

If you change the LAN IP address of the router while connected through the

browser, you will be disconnected. You may need to restart your computer for the new IP

address setting to take effect.

Reference Manual for the Broadband Voice Adapter TA612V

Advanced Configuration

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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 192.168.61.1

and 192.168.61.253, 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

Add

.

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 192.168.61.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.

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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.

How to Configure Static Routes

Static Routes provide additional routing information to your router. Under normal circumstances,

the router has adequate routing information after it has been configured for Internet access, and

you do not need to configure additional static routes. You must configure static routes only for

unusual cases such as multiple routers or multiple IP subnets located on your network.

From the Main Menu of the browser interface, under Advanced, click on Static Routes to view the

Static Route menu, shown below.

Figure 6-6.

Static Route Summary Table

To add or edit a Static Route: