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Page 51 / 144 Scroll up to view Page 46 - 50
48
Setting Up: Advanced
Linksys EA-Series
2.
Connect an Ethernet network cable to a
LAN/Ethernet
port on your
upstream network to the yellow
Internet
port on your router.
CAUTION
Connect the upstream network to your router’s yellow
Internet
port,
not
one of the blue Ethernet ports. If you connect to an
Ethernet port, you create IP addressing problems for the office
network.
TIPS
An office network often has a wall plate with an Ethernet port that
you can connect to.
If you are doing this in a home environment (without wall ports),
connect an Ethernet network cable between a LAN port on your
upstream router and the
Internet
port on your Linksys router.
3.
Run your router’s setup CD on each computer that you want to connect
to the Linksys router. Each computer needs either a wired or wireless
connection to the Linksys router. For more information, see “How to
connect a computer to your network” on page 18.
The computers that are connected to the Linksys router are now on the same
network, and are isolated from the upstream network. However, you will still
have access to the Internet through the upstream router (by way of your Linksys
router). Because two routers are between your computer and the Internet,
Internet traffic undergoes two network address translations. This is sometimes
referred to as
Double NAT
.
Your computers can also use the built-in capabilities of your Linksys router,
such as parental controls. If you need further control over the type of content
your employees or family access, you can create an account with an Internet
filtering site such as
www.opendns.com
or
www.bsecure.com
. After you
create an account with them, use their DNS in place of your ISP’s DNS.
To use their DNS:
1.
Log into Cisco Connect Cloud. (See “How to configure your router” on
page 14.
2.
Under
Router Settings
, click
Connectivity
.
3.
Click the
Local Network
tab.
4.
Complete the
Static DNS
fields with the information provided by your
content filtering provider.
5.
Click
OK
.
Page 52 / 144
49
Setting Up: Advanced
Linksys EA-Series
To extend your network
This topic covers cases three and four above.
NOTE
This is a complex process, so this procedure assumes that you have
some networking knowledge.
To extend your network or add wireless capabilities:
1.
If you want to extend your network, you may also follow the instructions
above. One example of this might be to provide a separate wireless
network for your children to keep their wireless network traffic separate
from your wireless network. You might also want to isolate one network
from another network so that network shares aren’t visible across
networks. In this case, use an Ethernet cable to connect the
Internet
port of the downstream router to one of the LAN ports of the upstream
router. Make sure that the local network subnets on the two routers are
different.
- OR -
You can extend your network by turning the downstream router into an
access point. (See “How to use a router as an access point” on page 45).
When you use a router as an access point, computers connected to the
access point are on the same IP subnet as all other devices connected to
the router. File, printer, and media sharing is much easier if all devices are
on the same subnet.
How to expose a device to the Internet
Why would I expose a device to the Internet?
If you are operating a web
server, a mail server, or a web camera, you may want to expose that device to
the Internet so anybody can access it. Your router includes a
DMZ
(Demilitarized
Zone) feature that forwards all inbound ports presented on the WAN interface,
except those that are specifically forwarded, to an individual IP address or
MAC address. This feature is normally not used, because it presents significant
security risks to the device that you designate for the DMZ. The DMZ device is
not protected by the built-in firewalls, Internet filters, or router web filters, and
is open to attacks from hackers.
A much safer way of “exposing” devices to the Internet would be to use port
forwarding. See “How to set up port forwarding” on page 51.
To set up a device in the DMZ:
1.
Configure your device with a static IP address. See your device’s
documentation for help with setting a static IP address or use DHCP
reservation (see “How to set up the DHCP server on your router” on
page 38).
2.
Log into Cisco Connect Cloud. (See “How to configure your router” on
page 14.
3.
Under
Router Settings
, click
Security
, then click the
DMZ
tab.
Page 53 / 144
50
Setting Up: Advanced
Linksys EA-Series
4.
Click the setting for
DMZ
to turn it on.
5.
Select
Enabled
.
6.
In the
Source IP Address
section, select
Any IP Address
to allow access to
your DMZ device from the entire Internet, or select the alternate button
and enter a range of allowed source addresses.
7.
In the
Destination IP Address
section, enter the last three digits of the IP
address of the device that will be in the DMZ. The rest of the IP address is
already completed.
- OR -
If you want to specify the 12-digit MAC address of the device instead of
setting up a DHCP address reservation, you can replace Step 6 with the
following steps:
a.
In the
Destination IP Address
section, select
MAC Address
, then click
View DHCP Client Table
. The
DHCP Client Table
screen opens.
b.
Click
Select
next to the device that you want to place in the DMZ,
then click
Close
. The corresponding MAC address is copied into the
MAC Address
field.
c.
Click
OK
.
Page 54 / 144
51
Port Forwarding and Port Triggering
Linksys EA-Series
51
How to set up port forwarding
Why would I use port forwarding?
Port forwarding is a feature that forwards
inbound traffic from the Internet on a specific port or ports to a specific device
or port on your local network. You can set up port forwarding for:
•
A single port (see “How to set up port forwarding for a single port” below)
•
Multiple ports (see “How to set up port forwarding for multiple ports” on
page 52)
•
A range of ports (see “How to set up port forwarding for a range of ports”
on page 52)
How to set up port forwarding for a single port
Why would I use port forwarding for a single port?
Single port forwarding
is a feature that forwards inbound traffic from the Internet on a specific port to
a single device on your local network. An example of single port forwarding
would be to forward inbound web requests, typically on port 80, to a web
server.
TIP
See the device’s documentation for port and protocol information.
To set up single port forwarding:
1.
Follow your device’s instructions for configuring it with a static IP address
or use DHCP reservation to assign it a permanent address (see “How to
set up the DHCP server on your router” on page 38).
2.
Log into Cisco Connect Cloud. (See “How to configure your router” on
page 14.
3.
Under
Router Settings,
click
Security
.
4.
Click the
Apps and Gaming
tab.
5.
Click
Single Port Forwarding
. The
Single Port Forwarding
screen opens.
6.
Click
Add a new Single Port Forwarding
.
7.
In the
Application name
field, enter a descriptive name.
8.
In the
External Port
field, type the external port number (not always
required).
9.
In the
Internal Port
field, type the internal port number (not always
required).
10.
In the
Protocol
drop-down list, select
TCP
,
UDP
, or
Both
(default).
11.
In the
Device IP#
field, enter the last three digits of the IP address you
have reserved for the computer you want to forward Internet traffic to.
The rest of the IP address has already been completed for you.
12.
Select
Enabled
, then click
Save
. If you don’t want to use port forwarding
but want to keep the information in the table, unselect the checkbox.
Port Forwarding and Port Triggering
Page 55 / 144
52
Port Forwarding and Port Triggering
Linksys EA-Series
How to set up port forwarding for multiple ports
Why would I set up port forwarding for multiple ports?
Port forwarding is
a feature that forwards inbound traffic from the Internet on a specific port to
a single device on your local network. Unlike a web camera that typically only
requires a single port to be forwarded, some applications require forwarding
of multiple ports.
VNC
(Virtual Network Computing) software that allows you to
operate your computer remotely from anywhere on the Internet is an example
of an application that requires multiple ports to be forwarded. To forward to
multiple ports, just create additional entries to forward additional ports to the
same IP address.
Example
: You want to set up your computer so you can remotely access it using
VNC software. By default, VNC uses TCP ports 5800 and 5900.
To set up single port forwarding for multiple ports:
1.
Make sure that the software you want to use has been installed onto a
networked computer.
2.
Log into Cisco Connect Cloud. (See “How to configure your router” on
page 14.
3.
Set up DHCP reservation for the IP address of the computer on which
you installed the software. (See “Configuration du serveur DHCP de votre
routeur” on page 39).
4.
Under
Router Settings,
click
Security
.
5.
Click the
Apps and Gaming
tab.
6.
Click
Single Port Forwarding
. The
Single Port Forwarding
screen opens.
7.
Click
Add a new Single Port Forwarding
.
8.
In the
Application name
field, enter a descriptive name.
9.
Enter in the same port number for the
External Port
and the
Internal
Port
.
10.
In the
Protocol
drop-down list, select
TCP
,
UDP
, or
Both
(default).
11.
In the
Device IP#
field, enter the last three digits of the IP address you
have reserved for the computer you want to forward Internet traffic to.
The rest of the IP address has already been completed for you.
12.
Select
Enabled
, then click
Save
. If you don’t want to use port forwarding
but want to keep the information in the table, unselect the checkbox.
NOTE
If you want to use software such as VNC on multiple computers,
you will need to reconfigure the default ports that VNC uses on
each additional computer. Then, create additional port forwarding
entries for each additional computer. See your software’s
documentation for help.
How to set up port forwarding for a range of ports
Why would I set up port forwarding for a range of ports?
Port forwarding is
a feature that forwards inbound traffic from the Internet on a range of ports to
a single device on your local network. Unlike a web camera that typically only
requires a single port to be forwarded, some applications require forwarding
to a range of ports.
Example
: You want to set up your computer so you can use BitTorrent, a
popular peer-to-peer file sharing application. BitTorrent uses port 6881 by
default. If that port is busy, the requesting BitTorrent client tries the next port
in sequence. The most common configuration for home routers with a single
BitTorrent computer is to set up port forwarding using a range of ports starting
with 6881 and ending with port 6889.

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