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Chapter 8 Home Networking
VMG4380-B10A / VMG4325-B10A User’s Guide
151
Figure 58
Network Settings > Home Networking > 5th Ethernet Port
The following table describes the fields in this screen.
8.10
The LAN VLAN Screen
Click
Network Setting
>
Home Networking
>
LAN VLAN
to open this screen. Use this screen to
control the VLAN ID and IEEE 802.1p priority tags of traffic sent out through individual LAN ports.
Figure 59
Network Setting > Home Networking > LAN VLAN
The following table describes the labels in this screen.
Table 37
Network Settings > Home Networking > 5th Ethernet Port
LABEL
DESCRIPTION
State
Select
Enable
to use the Ethernet WAN port as a LAN port on the Device.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to exit this screen without saving.
Table 38
Network Setting > Home Networking > LAN VLAN
LABEL
DESCRIPTION
Lan Port
These represent the Device’s LAN ports.
Tag Operation
Select what you want the Device to do to the IEEE 802.1q VLAN ID and priority tags of
downstream traffic before sending it out through this LAN port.
•
Unchange
- Don’t do anything to the traffic’s VLAN ID and priority tags.
•
Add
- Add VLAN ID and priority tags to untagged traffic.
•
Remove
- Delete one tag from tagged traffic. If the frame has double tags, this removes
the outer tag. This does not affect untagged traffic.
•
Remark
- Change the value of the outer VLAN ID and priority tags.
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8.11
Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.11.1
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
8.11.2
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.
802.1P Mark
Use this option to set what to do for the IEEE 802.1p priority tags when you add or remark
the tags for a LAN port’s downstream traffic. Either select
Unchange
to not modify the
traffic’s priority tags or select an priority from 0 to 7 to use. The larger the number, the
higher the priority.
VLAN ID
If you will add or remark tags for this LAN port’s downstream traffic, specify the VLAN ID
(from 0 to 4094) to use here.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 38
Network Setting > Home Networking > LAN VLAN (continued)
LABEL
DESCRIPTION
WAN
LAN
Page 153 / 367
Chapter 8 Home Networking
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153
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.
8.11.3
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 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.
8.11.4
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.
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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
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”.
Page 155 / 367
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155
C
HAPTER
9
Routing
9.1
Overview
The Device usually uses the default gateway to route outbound traffic from computers on the LAN
to the Internet. To have the Device 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 Device’s LAN interface. The
Device routes most traffic from
A
to the Internet through the Device’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 61
Example of Routing Topology
9.1.1
What You Can Do in this Chapter
•
Use the
Static Route
screen to view and set up static routes on the Device (
Section 9.2 on page
156
).
•
Use the
Policy Forwarding
screen to configure policy routing on the Device. (
Section 9.3 on
page 157
).
•
Use the
RIP
screen to set up RIP settings on the Device. (
Section 9.4 on page 159
).
WAN
R1
R2
A
R3
LAN

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