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Page 131 / 327 Scroll up to view Page 126 - 130
Chapter 8 Home Networking
VMG3926-B10A User’s Guide
131
The following table describes the labels in this screen.
8.8
The TFTP Server Name Screen
Use the
TFTP Server Name
screen to identify a TFTP server for configuration file download using
DHCP option 66. RFC 2132 defines the option 66 open standard. DHCP option 66 supports the IP
address or the hostname of a single TFTP server.
Click
Network Setting
>
Home Networking
>
TFTP Server Name
to open this screen.
Figure 57
Network Setting > Home Networking > TFTP Server Name
The following table describes the labels in this screen.
8.9
Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.9.1
LANs, WANs and the VMG
The actual physical connection determines whether the VMG ports are LAN or WAN ports. There are
two separate IP networks, one inside the LAN network and the other outside the WAN network as
shown next.
Table 35
Network Setting > Home Networking > Wake on Lan
LABEL
DESCRIPTION
Wake by
Address
Select
Manual
and enter the IP address or MAC address of the device to turn it on remotely.
The drop-down list also lists the IP addresses that can be found in the VMG’s ARP table.
Select an IP address and it will then automatically update the IP address and MAC address
in the following fields.
IP Address
Enter the IPv4 IP address of the device to turn it on.
MAC Address
Enter the MAC address of the device to turn it on. A MAC address consists of six
hexadecimal character pairs.
Wake up
Click this to send a wake up packet to wake up the specified device.
Table 36
Network Setting > Home Networking > TFTP Server Name
LABEL
DESCRIPTION
TFTP Server
Name
Enter the
the IP address or the hostname of a single TFTP server.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Page 132 / 327
Chapter 8 Home Networking
VMG3926-B10A User’s Guide
132
Figure 58
LAN and WAN IP Addresses
8.9.2
DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to
obtain TCP/IP configuration at start-up from a server. You can configure the VMG as a DHCP server
or disable it. When configured as a server, the VMG provides the TCP/IP configuration for the
clients. If you turn DHCP service off, you must have another DHCP server on your LAN, or else the
computer must be manually configured.
IP Pool Setup
The VMG is pre-configured with a pool of IP addresses for the DHCP clients (DHCP Pool). See the
product specifications in the appendices. Do not assign static IP addresses from the DHCP pool to
your LAN computers.
8.9.3
DNS Server Addresses
DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa.
The DNS server is extremely important because without it, you must know the IP address of a
computer before you can access it. The DNS server addresses you enter when you set up DHCP are
passed to the client machines along with the assigned IP address and subnet mask.
There are two ways that an ISP disseminates the DNS server addresses.
•
The ISP tells you the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP gives you DNS server addresses, enter them in the
DNS Server
fields in
the
DHCP Setup
screen.
•
Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of
IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you explicit DNS
servers, chances are the DNS servers are conveyed through IPCP negotiation. The VMG supports
the IPCP DNS server extensions through the DNS proxy feature.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If
your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup
screen.
WAN
LAN
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Chapter 8 Home Networking
VMG3926-B10A User’s Guide
133
8.9.4
LAN TCP/IP
The VMG has built-in DHCP server capability that assigns IP addresses and DNS servers to systems
that support DHCP client capability.
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a LAN
share one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions in
selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. If this
is the case, it is recommended that you select a network number from 192.168.0.0 to
192.168.255.0 and you must enable the Network Address Translation (NAT) feature of the VMG.
The Internet Assigned Number Authority (IANA) reserved this block of addresses specifically for
private use; please do not use any other number unless you are told otherwise. Let's say you select
192.168.1.0 as the network number; which covers 254 individual addresses, from 192.168.1.1 to
192.168.1.254 (zero and 255 are reserved). In other words, the first three numbers specify the
network number while the last number identifies an individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember, for
instance, 192.168.1.1, for your VMG, but make sure that no other device on your network is using
that IP address.
The subnet mask specifies the network number portion of an IP address. Your VMG will compute the
subnet mask automatically based on the IP address that you entered. You don't need to change the
subnet mask computed by the VMG unless you are instructed to do otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the
Internet, for example, only between your two branch offices, you can assign any IP addresses to
the hosts without problems. However, the Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of IP addresses specifically for private networks:
• 10.0.0.0
— 10.255.255.255
• 172.16.0.0
— 172.31.255.255
•
192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a private
network. If you belong to a small organization and your Internet access is through an ISP, the ISP
can provide you with the Internet addresses for your local networks. On the other hand, if you are
part of a much larger organization, you should consult your network administrator for the
appropriate IP addresses.
Page 134 / 327
Chapter 8 Home Networking
VMG3926-B10A User’s Guide
134
Note: Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address assignment,
please refer to RFC 1597, “Address Allocation for Private Internets”
and RFC 1466,
“Guidelines for Management of IP Address Space”.
Page 135 / 327
VMG3926-B10A User’s Guide
135
C
HAPTER
9
Routing
9.1
Overview
The VMG usually uses the default gateway to route outbound traffic from computers on the LAN to
the Internet. To have the VMG send data to devices not reachable through the default gateway, use
static routes.
For example, the next figure shows a computer (
A
) connected to the VMG’s LAN interface. The VMG
routes most traffic from
A
to the Internet through the VMG’s default gateway (
R1
). You create one
static route to connect to services offered by your ISP behind router
R2
. You create another static
route to communicate with a separate network behind a router
R3
connected to the LAN.
Figure 59
Example of Routing Topology
9.2
The Routing Screen
Use this screen to view and configure the static route rules on the VMG. Click
Network Setting >
Routing > Static Route
to open the
following
screen.
Figure 60
Network Setting > Routing > Static Route
WAN
R1
R2
A
R3
LAN

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