D-Link DI-624 User Manual
D-Link AirPlusXtremeG
DI-624DI-624
DI-624
DI-624DI-624
High-Speed 2.4 GHz
Wireless Router
Manual
TM
Building Networks for People
Contents
Package Contents ................................................................................3
Introduction............................................................................................4
Wireless Basics ....................................................................................8
Getting Started ....................................................................................12
Using the Configuration Menu..............................................................14
Networking Basics ..............................................................................41
Troubleshooting...................................................................................70
Technical Specifications ......................................................................77
Contacting Technical Support ..............................................................80
Warranty and Registration ................................................................... 81
2
Package Contents
Contents of Package:
D-Link AirPlusXTREME G DI-624
High-Speed 2.4GHz Wireless Router
Power Adapter-DC 5V, 3.0A
Manual and Warranty on CD
Quick Installation Guide
Ethernet Cable
Note: Using a power supply with a different voltage rating than the one included with the
DI-624 will cause damage and void the warranty for this product.
If any of the above items are missing, please contact your reseller.
System Requirements for Configuration:
Ethernet-Based Cable or DSL Modem
Computers with Windows, Macintosh, or Linux-based
operating systems with an installed Ethernet adapter
Internet Explorer Version 6.0 or Netscape Navigator
Version 6.0 and Above
3
Introduction
The D-Link AirPlusXtremeG DI-624 High-Speed Wireless Router is a draft 802.11g highperformance, wireless router that supports high-speed wireless networking at home, at
work or in public places.
Unlike most routers, the DI-624 provides data transfers at up to 54 Mbps (compared to
the standard 11 Mbps) when used with other D-Link AirPlusXtremeG products. The
802.11g standard is backwards compatible with 802.11b products. This means that you
do not need to change your entire network to maintain connectivity. You may sacrifice
some of 802.11g’s speed when you mix 802.11b and 802.11g devices, but you will not
lose the ability to communicate when you incorporate the 802.11g standard into your
802.11b network. You may choose to slowly change your network by gradually replacing
the 802.11b devices with 802.11g devices .
In addition to offering faster data transfer speeds when used with other 802.11g products,
the DI-624 has the newest, strongest, most advanced security features available today.
When used with other 802.11g WPA (WiFi Protected Access) and 802.1x compatible
products in a network with a radius server, the security features include:
WPA*: A new security feature, Wi-Fi Protected Access authorizes and identifies users
based on a secret key that changes automatically at a regular interval.
WPA uses TKIP (Temporal Key Integrity Protocol) to change the temporal
key every 10,000 packets (a packet is a kind of message transmitted over a
network.) This insures much greater security than the standard WEP security.
(By contrast, the older WEP encryption required the keys to be changed
manually.)
802.1x: Authentication is a first line of defense against intrusion. In the Authentication
process the server verifies the identity of the client attempting to connect to the
network. Unfamiliar clients would be denied access.
For home users that will not incorporate a RADIUS server in their network, the security
for the DI-624, used in conjunction with other 802.11g products, will still be much stronger
than ever before. Utilizing the Pre Shared Key mode of WPA, the DI-624 will obtain a
new security key every time it connects to the 802.11g network. You only need to input
your encryption information once in the configuration menu. No longer will you have to
manually input a new WEP key frequently to ensure security, with the DI-624, you will
automatically receive a new key every time you connect, vastly increasing the safety of
your communications.
*WPA will be available Spring 2003 as a free download
4
Connections
Pressing the
Reset Button
restores the
router to its
original factory
default settings.
Auto MDI/MDIX
LAN ports
automatically sense
the cable type when
connecting to
Ethernet-enabled
computers.
The Auto MDI/
MDIX WAN port is
the connection for
the Ethernet cable
to the Cable or
DSL modem
Receptor for
the Power
Adapter
5
LEDS
.
W
A
A
A
A
A
M1 LED -
solid light
indicates that the
DI-614+ is ready.
DI-624 is ready.
M2 LED -
A solid light indicates that
A solid light indicates
the unit is defective.
that the unit is defective.
WAN LED -
solid light
indicates
connection on the
WAN port. This
LED blinks during
data transmission.
POWER LED -
solid light
indicates a proper
connection to the
power supply.
ess Basics
WLAN LED -
solid light
indicates that the
wireless segment
is ready. This
LED blinks
during wireless
data
transmission.
3
LOCAL
NETWORK LED -
solid light
indicates a
connection to an
Ethernet-enabled
computer on ports
1-4. This LED
blinks during data
transmission.
6
Features
Fully compatible with the 802.11g standard to provide a wireless data rate of
up to 54Mbps
Backwards compatible with the 802.11b standard to provide a wireless data
rate of up to 11Mbps
WPA* (Wi Fi Protected Access) authorizes and identifies users based on a
secret key that changes automatically at a regular interval, for example:
TKIP (Temporal Key Integrity Protocol), in conjunction with a RADIUS
server, changes the temporal key every 10,000 packets, ensuring greater
security
Pre Shared Key mode means that the home user, without a RADIUS
server, will obtain a new security key every time the he or she connects
to the network, vastly improving the safety of communications on the
network.
802.1x Authentication in conjunction with the radius server verifies the
identity of would be clients
Utilizes OFDM technology (Orthogonal Frequency Division Multiplexing)
User-friendly configuration and diagnostic utilities
Operates in the 2.4GHz frequency range
Connects multiple computers to a Broadband (Cable or DSL) modem to
share the Internet connection
Advanced Firewall features
Supports NAT with VPN pass-through, providing added security
MAC Filtering
IP Filtering
URL Filtering
Domain Blocking
Scheduling
DHCP server supported enables all networked computers to automatically
receive IP addresses
Web-based interface for Managing and Configuring
Access Control to manage users on the network
Supports special applications that require multiple connections
Equipped with 4 10/100 Ethernet ports, 1 WAN port, Auto MDI/MDIX
*WPA will be available Spring 2003 as a free download
7
Wireless Basics
D-Link wireless products are based on industry standards to provide easy-touse and compatible high-speed wireless connectivity within your home, business
or wherever a wireless network is available. D-Link wireless products will allow
you access to the data you want, when and where you want it. You will be able
to enjoy the freedom that wireless networking brings.
A wireless local area network (WLAN) is a cellular computer network that
transmits and receives data with radio signals instead of wires. WLANs are
used increasingly in both home and office environments, and public areas such
as airports, coffee shops and universities. Innovative ways to utilize WLAN
technology are helping people to work and communicate more efficiently.
Increased mobility and the absence of cabling and other fixed infrastructure
have proven to be beneficial for many users.
Wireless users can use the same applications they use on a wired network.
Wireless adapter cards used on laptop and desktop systems support the same
protocols as Ethernet adapter cards.
Under many circumstances, it may be desirable for mobile network devices to
link to a conventional Ethernet LAN in order to use servers, printers or an Internet
connection supplied through the wired LAN. A Wireless Router is a device that
can be used to provide this link.
8
Wireless Basics (continued)
People use WLAN technology for many different purposes:
Mobility - Productivity increases when people have access to data in any
location within the operating range of the WLAN. Management decisions
based on real-time information can significantly improve worker efficiency.
Low Implementation Costs – WLANs are easy to set up, manage,
change and relocate. Networks that frequently change, both physically and
logically, can benefit from a WLAN’s ease of implementation. WLANs can
operate in locations where installation of wiring may be impractical.
Installation and Network Expansion - Installing a WLAN system can be
fast and easy and can eliminate the need to pull cable through walls and
ceilings. Wireless technology allows the network to go where wires cannot
go-even outside the home or office.
Scalability – WLANs can be configured in a variety of ways to meet the
needs of specific applications and installations. Configurations are easily
changed and range from peer-to-peer networks suitable for a small number
of users to larger infrastructure networks to accommodate hundreds or
thousands of users, depending on the number of wireless devices deployed.
Inexpensive solution– Wireless network devices are as competitively
priced as conventional Ethernet network devices.
The DI-624 is compatible with the following wireless products:
D-Link Air DWL-650, D-Link AirPlus DWL-650+,
D-Link AirPlus XtremeG DWL-G650
Wireless Cardbus Adapters used with laptop computers
D-Link Air DWL-520 and D-Link AirPlus DWL-520+,
D-Link AirPlus XtremeG DWL-G520
Wireless PCI cards used with desktop computers
D-Link AirPlus DWL-900AP+ and DWL-2000AP+
Enhanced 2.4GHz Wireless Access Points
D-Link AirPlus DWL-800AP+
Enhanced 2.4GHz Wireless Range Extender
D-Link AirPlus DWL-810+
Enhanced 2.4GHz Ethernet-to-Wireless Bridge
9
Wireless Basics (continued)
Standards-Based Technology
The DI-624 Wireless Broadband Router utilizes the new 802.11g standard.
The IEEE 802.11g standard is an extension of the 802.11b standard. It increases
the data rate up to 54 Mbps within the 2.4GHz band, utilizing OFDM technology.
This means that in most environments, within the specified range of this device,
you will be able to transfer large files quickly or even watch a movie in MPEG
format over your network without noticeable delays. This technology works by
transmitting high-speed digital data over a radio wave utilizing OFDM (Orthogonal
Frequency Division Multiplexing) technology. OFDM works by splitting the radio
signal into multiple smaller sub-signals that are then transmitted simultaneously
at different frequencies to the receiver. OFDM reduces the amount of crosstalk
(interference) in signal transmissions. The D-Link DWL-G650 will automatically
sense the best possible connection speed to ensure the greatest speed and
range possible.
1
802.11g offers the most advanced network security features available today,
including: WPA , 802.1x, TKIP, AES and Pre-Shared Key mode. These security
2
features are explained in more detail in the Introduction and the Features section
of this manual.
The DI-624 is backwards compatible with 802.11b devices. This means that if
you have an existing 802.11b network, the devices in that network will be
compatible with 802.11g devices at speeds of up to 11Mbps in the 2.4GHz
range. Also based on the IEEE 802.11b standard, the DI-624 is interoperable
with existing compatible 2.4GHz wireless technology with data transfer speeds
of up to 11Mbps.
12802.11g standard is scheduled for ratification by IEEE Q3 2003
WPA will be available Spring 2003 as a free download
10
Wireless Basics (continued)
Installation Considerations
The D-Link AirPlus XtremeG DI-624 lets you access your network, using a
wireless connection, from virtually anywhere within its operating range. Keep
in mind, however, that the number, thickness and location of walls, ceilings, or
other objects that the wireless signals must pass through, may limit the range.
Typical ranges vary depending on the types of materials and background RF
(radio frequency) noise in your home or business. The key to maximizing
wireless range is to follow these basic guidelines:
1.
Keep the number of walls and ceilings between the DI-624 and your
receiving device (e.g., the DWL-G650 or the DWL-650+) to a minimum -
each wall or ceiling can reduce your D-Link AirPlus Wireless product’s
range from 3-90 feet (1-30 meters.) Position your receiving devices so
that the number of walls or ceilings is minimized.
2. Be aware of the direct line between routers and computers. A wall that is
1.5 feet thick (.5 meters), at a 45-degree angle appears to be almost 3
feet (1 meter) thick. At a 2-degree angle it looks over 42 feet (14 meters)
thick! Position devices so that the signal will travel straight through a wall
or ceiling (instead of at an angle) for better reception.
3. Building Materials can impede the wireless signal - a solid metal door or
aluminum studs may have a negative effect on range. Try to position
wireless devices and computers with wireless adapters so that the signal
passes through drywall or open doorways and not other materials.
4. Keep your product away (at least 3-6 feet or 1-2 meters) from electrical
devices or appliances that generate RF noise.
11
Getting Started
There are basically two modes of networking:
Infrastructure – using an Access Point, or Wireless Router,
such as the DI-624.
Ad-Hoc – directly connecting to another computer, for peer-to-
peer communication, using wireless network adapters on
each computer, such as two or more DWL-G650 wireless
network Cardbus adapters.
On the following pages we will show you an example of an Infrastructure
Network and an Ad-Hoc Network.
An Infrastructure network contains an Access Point or a Wireless Router.
The Infrastructure Network example shown on the following page contains
the following D-Link network devices (your existing network may be
comprised of other devices):
A wireless Router - D-Link AirPlus DI-624
A laptop computer with a wireless adapter -
D-Link AirPro DWL-G650
A desktop computer with a wireless adapter -
D-Link AirPlusXtremeG DWL-G520, D-Link Air DWL-520,
or D-Link AirPlus DWL-520+
(D-Link Air devices have speeds up to 11Mbps)
A Cable modem - D-Link DCM-200
12
Getting Started
Setting up a
Wireless
Infrastructure
Network
2
1
3
4
6
5
Please remember that D-Link AirXtremeG wireless devices are pre-configured to
connect together, right out of the box, with their default settings.
For a typical wireless setup at home (as shown above), please do the
following:
You will need broadband Internet access (a Cable or DSL-subscriber line into
your home or office)
Consult with your Cable or DSL provider for proper installation of the modem
Connect the Cable or DSL modem to the DI-624 Wireless Broadband Router
(see the printed Quick Installation Guide included with your router.)
If you are connecting a desktop computer to your network, install the D-Link
AirPlus XtremeG DWL-G520 wireless PCI adapter into an available PCI slot on
your desktop computer. You may also install the DWL-520+, or the DWL-520.
(See the printed Quick Installation Guide included with the network adapter.)
Install the drivers for the D-Link DWL-G650 wireless Cardbus adapter into a
laptop computer.
(See the printed Quick Installation Guide included with the DWL-G650.)
Install the drivers for the D-Link DFE-530TX wireless Cardbus adapter into a
desktop computer. The four Ethernet LAN ports of the DI-624 are Auto MDI/MDIX
and will work with both Straight-Through and Cross-Over cable.
(See the printed Quick Installation Guide included with the DFE-530TX.)
13
Using the Configuration Menu
After you have completed the Setup Wizard (please see the Quick Installation Guide that
came with the product) you can access the Configuration menu at any time by opening
the web browser and typing in the IP Address of the DI-624. The DI-624 default IP Address
is shown below:
Open the web browser
Type in the IP Address of the
Router
Note: if you have changed the default IP Address assigned to the DI-624, make sure to
enter the correct IP Address.
Type admin in the User
Name field
blank
Leave the Password
Click Next
http://192.168.0.1
Connect to 192.168.0.1
admin
The Home>Wizard
screen will appear.
Please refer to the
Quick Installation
Guide for more infor-
mation regarding the
Setup Wizard.
Home > Wizard
14
Using the Configuration Menu
Home > Wireless
SSID-
Channel-
WEP-
WEP Encryption-
Key Type-
Passphrase-
Keys 1-4-
Apply-
Service Set Identifier (SSID) is the name designated for a specific wireless local area network (WLAN). The SSID’s factory
default setting is default. The SSID can be easily changed to
connect to an existing wireless network or to establish a new
wireless network.
6 is the default channel. All devices on the network must share
the same channel. (Note: The wireless adapters will automati-
cally scan and match the wireless setting.)
Wired Equivalent Privacy (WEP) is a wireless security protocol
for Wireless Local Area Networks (WLAN). WEP provides security by encrypting the data that is sent over the WLAN. Select
Enabled or Disabled. Disabled is the default setting. (Note: If
you enable encryption on the DI-624 make sure to also enable
encryption on all the wireless clients or wireless connection will
not be established.)
Select the level of encryption desired: 64-bit, or 128-bit
Select HEX or ASCII
When you select Key Type: ASCII, you can enter a Passphrase
for any or all of Keys 1-4
Input up to 4 WEP keys; select the one you wish to use.
Click Apply to save the changes.
15
Using the Configuration Menu
Home > WAN > Dynamic IP Address
DI-754
Dynamic
IP Address-
Host Name-
MAC Address-
Clone
MAC Address-
Apply-
Choose Dynamic IP Address to obtain IP Address information
automatically from your ISP. Select this option if your ISP does
not give you any IP numbers to use. This option is commonly
used for Cable modem services.
The Host Name is optional but may be required by some ISPs.
The default host name is the device name of the Router and may
be changed.
The default MAC Address is set to the WAN’s physical interface MAC address on the Broadband Router. It is not recommended that you change the default MAC address unless required by your ISP.
The default MAC address is set to the WAN’s physical interface
MAC address on the Broadband Router. You can use the “Clone
MAC Address” button to copy the MAC address of the Ethernet
Card installed by your ISP and replace the WAN MAC address
with the MAC address of the router. It is not recommended that
you change the default MAC address unless required by your
ISP.
Click Apply to save the changes.
16
Using the Configuration Menu
Home > WAN > Static IP Address
Static IP Address-
IP Address-
Subnet Mask-
ISP
Gateway Address-
Primary
DNS Address-
Secondary
DNS Address-
Apply-
Choose Static IP Address if all WAN IP information is provided to
you by your ISP. You will need to enter in the IP address, subnet
mask, gateway address, and DNS address(es) provided to you
by your ISP. Each IP address entered in the fields must be in the
appropriate IP form, which are four octets separated by a dot
(x.x.x.x). The Router will not accept the IP address if it is not in
this format.
Input the public IP Address provided by your ISP
Input your Subnet mask. (All devices in the network must have
the same subnet mask.)
Input the public IP address of the ISP to which you are connecting
Input the primary DNS (Domain Name Server) IP address provided by your ISP
This is optional
Click Apply to save the changes.
17
Using the Configuration Menu
Home > WAN > PPPoE
Please be sure to
remove any existing
PPPoE client software
installed on your
computers.
Choose PPPoE (Point to
Point Protocol over
Ethernet) if your ISP uses
a PPPoE connection. Your
ISP will provide you with a
username and password.
This option is typically
used for DSL services. Select Dynamic PPPoE to ob-
tain an IP address automatically for your PPPoE
connection. Select Static
PPPoE to use a static IP
address for your PPPoeE
connection.
PPPoE-
User Name-
Retype Password-
Service Name-
IP Address-
Primary DNS
Address-
Secondary
DNS Address-
Maximum Idle
Time-
Choose this option if your ISP uses PPPoE. (Most DSL users
will select this option.)
Dynamic PPPoE- receive an IP Address automatically from
your ISP.
Static PPPoE-you have an assigned (static) IP Address.
Your PPPoE username provided by your ISP.
Re-enter the PPPoE password
Enter the Service Name provided by your ISP (optional).
This option is only available for Static PPPoE. Enter the static IP
Address for the PPPoE connection.
Primary DNS IP address provided by our ISP
This option is only available for Static PPPoE. Enter the static IP
Address for the PPPoE connection.
The amount of time of inactivity before disconnecting your PPPoE
session. Enter a Maximum Idle Time (in minutes) to define a
maximum period of time for which the Internet connection is maintained during inactivity. If the connection is inactive for longer
than the defined Maximum Idle Time, then the connection will be
dropped. Either set this to zero or enable Auto-reconnect to disable this feature. (Continued on the next page)
18
Using the Configuration Menu
Home > WAN > PPPoE continued
MTU-
Auto-reconnect-
Apply-
Home > LAN
Maximum Transmission Unit-1492 is the default setting-you may
need to change the MTU for optimal performance with your
specific ISP.
If enabled, the DI-754 will automatically connect to your ISP after your system is restarted or if the PPPoE connection is dropped.
Click Apply to save the changes.
LAN is short for Local Area Network. This is considered your internal network. These are
the IP settings of the LAN interface for the DI-624. These settings may be referred to as
Private settings. You may change the LAN IP address if needed. The LAN IP address is
private to your internal network and cannot be seen on the Internet.
IP Address-
Subnet Mask-
Local Domain Name-
Apply-
The IP address of the LAN interface. The default IP address is:
192.168.0.1
The subnet mask of the LAN interface.
The default subnet mask is 255.255.255.0
This field is optional. Enter in the local domain name.
Click Apply to save the changes.
19
Using the Configuration Menu
Home > DHCP
DI-754
DHCP stands for Dynamic Host Control Protocol. The DI-624 has a built-in DHCP server.
The DHCP Server will automatically assign an IP address to the computers on the LAN/
private network. Be sure to set your computers to be DHCP clients by setting their TCP/
IP settings to “Obtain an IP Address Automatically.” When you turn your computers on,
they will automatically load the proper TCP/IP settings provided by the DI-624. The
DHCP Server will automatically allocate an unused IP address from the IP address pool
to the requesting computer. You must specify the starting and ending address of the IP
address pool.
DHCP Server-
Starting
IP Address-
Ending
IP Address-
Lease Time-
Apply-
Select Enabled or Disabled. The default setting is Enabled.
The starting IP address for the DHCP server’s IP assignment
The ending IP address for the DHCP server’s IP assignment
The length of time for the IP lease. Enter the Lease time. The
default setting is one hour
click Apply to save the changes
20
Using the Configuration Menu
Advanced > Virtual Server
The DI-624 can be configured as a virtual server so that remote users accessing Web
or FTP services via the public IP address can be automatically redirected to local
servers in the LAN (Local Area Network).
The DI-624 firewall feature filters out unrecognized packets to protect your LAN
network so all computers networked with the DI-624 are invisible to the outside world.
If you wish, you can make some of the LAN computers accessible from the Internet
by enabling Virtual Server. Depending on the requested service, the DI-624 redirects
the external service request to the appropriate server within the LAN network.
21
Using the Configuration Menu
Advanced > Virtual Server continued
The DI-624 is also capable of port-redirection meaning incoming traffic to a particular
port may be redirected to a different port on the server computer.
Each virtual service that is created will be listed at the bottom of the screen in the
Virtual Servers List. There are pre-defined virtual services already in the table. You
may use them by enabling them and assigning the server IP to use that particular
virtual service.
Virtual Server-
Name-
Private IP-
Select Enabled or Disabled
Enter the name referencing the virtual service
The server computer in the LAN (Local Area Network) that will be
providing the virtual services.
Protocol Type- The protocol used for the virtual service
Private Port-
Public Port-
Schedule-
Apply-
The port number of the service used by the Private IP computer
The port number on the WAN (Wide Area Network) side that will
be used to access the virtual service.
The schedule of time when the virtual service will be enabled.
The schedule may be set to Always, which will allow the
particular service to always be enabled. If it is set to Time,
select the time frame for the service to be enabled. If the
system time is outside of the scheduled time, the service will
be disabled.
Click Apply to save the changes.
Example #1:
If you have a Web server that you wanted Internet users to access at all times, you
would need to enable it. Web (HTTP) server is on LAN (Local Area Network)
computer 192.168.0.25. HTTP uses port 80, TCP.
Name: Web Server
Private IP: 192.168.0.25
Protocol Type: TCP
Private Port: 80
Public Port: 80
Schedule: always
22
Using the Configuration Menu
Advanced > Virtual Server continued
Click on this icon to edit the virtual service
Example #2:
If you have an FTP server that you wanted Internet users to access by WAN port
2100 and only during the weekends, you would need to enable it as such. FTP
server is on LAN computer 192.168.0.30. FTP uses port 21, TCP.
Name: FTP Server
Private IP: 192.168.0.30
Protocol Type: TCP
Private Port: 21
Public Port: 2100
Schedule: From: 01:00AM to 01:00AM, Sat to Sun
Click on this icon to delete the virtual service
All Internet users who want to access this FTP Server
must connect to it from port 2100. This is an example of
port redirection and can be useful in cases where there
are many of the same servers on the LAN network.
23
Using the Configuration Menu
Advanced > Applications
Some applications require multiple connections, such as Internet gaming, video
conferencing, Internet telephony and others. These applications have difficulties
working through NAT (Network Address Translation). Special Applications makes
some of these applications work with the DI-624. If you need to run applications that
require multiple connections, specify the port normally associated with an application
in the “Trigger Port” field, select the protocol type as TCP or UDP, then enter the
public ports associated with the trigger port to open them for inbound traffic.
The DI-624 provides some predefined applications in the table on the bottom of the
web page. Select the application you want to use and enable it.
Note! Only one PC can use each Special Application tunnel.
Name:
This is the name referencing the special application.
Trigger Port: This is the port used to trigger the application. It can be either
a single port or a range of ports.
Trigger Type: This is the protocol used to trigger the special application.
Public Port:
This is the port number on the WAN side that will be used to
access the application. You may define a single port or a
range of ports. You can use a comma to add multiple ports or
port ranges.
Public Type: This is the protocol used for the special application.
Apply:
Click Apply to save the changes
24
Using the Configuration Menu
Advanced > Filters > IP Filters
Filters are used to deny or allow LAN (Local Area Network) computers from accessing
the Internet. The DI-624 can be setup to deny internal computers by their IP or MAC
addresses. The DI-624 can also block users from accessing restricted web sites.
IP Filters
IP:
Port:
Protocol Type:
Schedule:
Apply:
Use IP Filters to deny LAN IP addresses from accessing the
Internet. You can deny specific port numbers or all ports for
the specific IP address.
The IP address of the LAN computer that will be denied
access to the Internet.
The single port or port range that will be denied access to the
Internet.
Select the protocol type
This is the schedule of time when the IP Filter will be enabled.
Click Apply to save changes.
25
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