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Page 136 / 331 Scroll up to view Page 131 - 135
Chapter 8 Home Networking
VMG1312-B Series User’s Guide
136
8.6
The STB Vendor ID Screen
Set Top Box (STB) devices with dynamic IP addresses sometimes don’t renew their IP addresses
before the lease time expires. This could lead to IP address conflicts if the STB continues to use an
IP address that gets assigned to another device. Use this screen to view the Vendor IDs of
connected STBs and the static DHCP entries that the Device automatically created for them when
they requested IP addresses.
Click
Network Setting
>
Home Networking
>
STB Vendor ID
to open this screen.
Figure 57
Network Setting > Home Networking > STB Vendor ID
The following table describes the labels in this screen.
8.6.1
The Add/Edit STB Vendor ID Screen
Use this screen to configure an STB’s Vendor Class Identifier (DHCP option 60).
Click
Network Setting
>
Home Networking
>
STB Vendor ID
to open this screen.
IP Subnet Mask
Enter the public IP subnet mask provided by your ISP.
Offer Public IP
by DHCP
Select the checkbox to enable the Device to provide public IP addresses by DHCP server.
Enable ARP
Proxy
Select the checkbox to enable the ARP (Address Resolution Protocol) proxy.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 34
Network Setting > Home Networking > Additional Subnet (continued)
LABEL
DESCRIPTION
Table 35
Network Setting > Home Networking > STB Vendor ID
LABEL
DESCRIPTION
Add New STB
Vendor
Click this button to manually create an entry.
Vendor ID
This is an STB’s Vendor Class Identifier (DHCP option 60). A Vendor Class Identifier is
usually used to inform the DHCP server a DHCP client’s vendor and functionality.
DHCP Option
This is the DHCP option 43 value the Device assigns to the STB.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
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Chapter 8 Home Networking
VMG1312-B Series User’s Guide
137
Figure 58
Network Setting > Home Networking > STB Vendor ID
The following table describes the labels in this screen.
8.7
The TFTP Server Name Screen
Use the
TFTP Server
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 59
Network Setting > Home Networking > TFTP Server Name
The following table describes the labels in this screen.
Table 36
Network Setting > Home Networking > STB Vendor ID
LABEL
DESCRIPTION
STB Vendor ID
Enter an STB’s Vendor Class Identifier which is used for informing the DHCP server the
STB’s vendor and functionality.
DHCP Option 43
Enter the IP address the Device assigns to the STB. Select
HEX
if it is a hex string.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 37
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 138 / 331
Chapter 8 Home Networking
VMG1312-B Series User’s Guide
138
8.8
Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.8.1
LANs, WANs and the Device
The actual physical connection determines whether the Device 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.
Figure 60
LAN and WAN IP Addresses
8.8.2
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 Device as a DHCP
server or disable it. When configured as a server, the Device 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 Device 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.
8.8.3
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.
WAN
LAN
Page 139 / 331
Chapter 8 Home Networking
VMG1312-B Series User’s Guide
139
•
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 Device
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.
8.8.4
LAN TCP/IP
The Device 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 Device.
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 Device, 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 Device 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 Device 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
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Chapter 8 Home Networking
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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.
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”.

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