TP-Link TL-ER6120 User manual

TL-ER6120
Gigabit Dual-WAN VPN Router
REV1.2.0
1910010936

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COPYRIGHT & TRADEMARKS
Specifications are subject to change without notice. is a registered trademark of
TP-LINK TECHNOLOGIES CO., LTD. Other brands and product names are trademarks of their
respective holders.
No part of the specifications may be reproduced in any form or by any means or used to make any
derivative such as translation, transformation, or adaptation without permission from TP-LINK
TECHNOLOGIES CO., LTD. Copyright © 2014 TP-LINK TECHNOLOGIES CO., LTD. All rights
reserved.
http://www.tp-link.com
FCC STATEMENT
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions:
1) This device may not cause harmful interference.
2) This device must accept any interference received, including interference that may cause
undesired operation.
Any changes or modifications not expressly approved by the party responsible for compliance could
void the user’s authority to operate the equipment.
CE Mark Warning
This is a class A product. In a domestic environment, this product may cause radio interference, in
which case the user may be required to take adequate measures.

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Продукт сертифіковано згідно справилами системи УкрСЕПРО на відповідність вимогам
нормативних документів та вимогам, що передбачені чинними законодавчими актами України.
Safety Information
When product has power button, the power button is one of the way to shut off the product; When
there is no power button, the only way to completely shut off power is to disconnect the product or
the power adapter from the power source.
Don’t disassemble the product, or make repairs yourself. You run the risk of electric shock and
voiding the limited warranty. If you need service, please contact us.
Avoid water and wet locations.
安全諮詢及注意事項
●請使用原裝電源供應器或只能按照本產品注明的電源類型使用本產品。
●清潔本產品之前請先拔掉電源線。請勿使用液體、噴霧清潔劑或濕布進行清潔。
●注意防潮，請勿將水或其他液體潑灑到本產品上。 
●插槽與開口供通風使用，以確保本產品的操作可靠並防止過熱，請勿堵塞或覆蓋開口。
●請勿將本產品置放於靠近熱源的地方。除非有正常的通風，否則不可放在密閉位置中。
●請不要私自打開機殼，不要嘗試自行維修本產品，請由授權的專業人士進行此項工作。
此為甲類資訊技術設備，于居住環境中使用時，可能會造成射頻擾動，在此種情況下，使用者會被要求
採取某些適當的對策。
This product can be used in the following countries:
AT BG BY CA CZ DE DK EE
ES FI FR GB GR HU IE IT
LT LV MT NL NO PL PT RO
RU SE SK TR UA

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CONTENTS
Package Contents..................................................................................................................1
Chapter 1 About this Guide ...................................................................................................2
1.1 Intended Readers ..................................................................................................................2
1.2 Conventions ...........................................................................................................................2
1.3 Overview of this Guide...........................................................................................................2
Chapter 2 Introduction ..........................................................................................................4
2.1 Overview of the Router ..........................................................................................................4
2.2 Features.................................................................................................................................5
2.3 Appearance............................................................................................................................6
2.3.1 Front Panel ................................................................................................................6
2.3.2 Rear Panel.................................................................................................................7
Chapter 3 Configuration ........................................................................................................9
3.1 Network..................................................................................................................................9
3.1.1 Status.........................................................................................................................9
3.1.2 System Mode.............................................................................................................9
3.1.3 WAN ........................................................................................................................12
3.1.4 LAN..........................................................................................................................28
3.1.5 DMZ.........................................................................................................................31
3.1.6 MAC Address...........................................................................................................33
3.1.7 Switch ......................................................................................................................34
3.2 User Group ..........................................................................................................................41
3.2.1 Group.......................................................................................................................41
3.2.2 User .........................................................................................................................42
3.2.3 View.........................................................................................................................42
3.3 Advanced .............................................................................................................................44
3.3.1 NAT..........................................................................................................................44
3.3.2 Traffic Control ..........................................................................................................52

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3.3.3 Session Limit ...........................................................................................................55
3.3.4 Load Balance...........................................................................................................57
3.3.5 Routing ....................................................................................................................61
3.4 Firewall.................................................................................................................................66
3.4.1 Anti ARP Spoofing ...................................................................................................66
3.4.2 Attack Defense ........................................................................................................69
3.4.3 MAC Filtering ...........................................................................................................71
3.4.4 Access Control.........................................................................................................71
3.4.5 App Control..............................................................................................................77
3.5 VPN......................................................................................................................................79
3.5.1 IKE...........................................................................................................................79
3.5.2 IPsec........................................................................................................................83
3.5.3 L2TP/PPTP..............................................................................................................90
3.6 Services ...............................................................................................................................94
3.6.1 PPPoE Server..........................................................................................................94
3.6.2 E-Bulletin ...............................................................................................................100
3.6.3 Dynamic DNS ........................................................................................................102
3.6.4 UPnP .....................................................................................................................108
3.7 Maintenance ......................................................................................................................109
3.7.1 Admin Setup ..........................................................................................................109
3.7.2 Management.......................................................................................................... 112
3.7.3 License ..................................................................................................................114
3.7.4 Statistics.................................................................................................................115
3.7.5 Diagnostics ............................................................................................................117
3.7.6 Time.......................................................................................................................119
3.7.7 Logs.......................................................................................................................122
Chapter 4 Application........................................................................................................124
4.1 Network Requirements.......................................................................................................124

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4.2 Network Topology...............................................................................................................125
4.3 Configurations....................................................................................................................125
4.3.1 Internet Setting ......................................................................................................125
4.3.2 VPN Setting ...........................................................................................................127
4.3.3 Network Management............................................................................................133
4.3.4 Network Security....................................................................................................137
Chapter 5 CLI ................................................................................................................143
5.1 Configuration......................................................................................................................143
5.2 Interface Mode ...................................................................................................................146
5.3 Online Help ........................................................................................................................147
5.4 Command Introduction.......................................................................................................149
5.4.1 ip............................................................................................................................149
5.4.2 ip-mac....................................................................................................................149
5.4.3 sys .........................................................................................................................150
5.4.4 user........................................................................................................................151
5.4.5 history ....................................................................................................................152
5.4.6 exit .........................................................................................................................153
Appendix A Hardware Specifications ...........................................................................154
Appendix B FAQ .........................................................................................................155
Appendix C Glossary ..................................................................................................157

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Package Contents
The following items should be found in your package:
One TL-ER6120 Router
One Power Cord
One Console Cable
One Ground Cable
Two mounting brackets and other fittings
Installation Guide
Resource CD
Note:
Make sure that the package contains the above items. If any of the listed items is damaged or missing,
please contact with your distributor.

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Chapter 1 About this Guide
This User Guide contains information for setup and management of TL-ER6120 router. Please read
this guide carefully before operation.
1.1 Intended Readers
This Guide is intended for Network Engineer and Network Administrator.
1.2 Conventions
In this Guide the following conventions are used:
The router or TL-ER6120 mentioned in this Guide stands for TL-ER6120 SafeStream Gigabit
Dual-WAN VPN Router without any explanation.
Menu Name→Submenu Name→Tab page indicates the menu structure. Advanced→NAT
→Basic NAT means the Basic NAT page under the NAT menu option that is located under the
Advanced menu.
Bold font indicates a toolbar icon, menu or menu item.
<Font> indicate a button.
Symbols in this Guide:
Symbol Description
Note:
Ignoring this type of note might result in a malfunction or damage to the
device.
Tips:
This format indicates important information that helps you make better use of
your device.
1.3 Overview of this Guide
Chapter 1 About This Guide Introduces the guide structure and conventions.
Chapter 2 Introduction Introduces the features and appearance of TL-ER6120 router.
Chapter 3 Configurations Introduces how to configure the router via Web management page.
Chapter 4 Application Introduces the practical application of the router on the enterprise network.
Chapter5 CLI Introduces how to log in and set up the router using CLI commands by
console port.

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Appendix A Hardware
Specifications
Lists the hardware specifications of this router.
Appendix B FAQ Provides the possible solutions to the problems that may occur during the
installation and operation of the router.
Appendix C Glossary Lists the glossary used in this guide.

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Chapter 2 Introduction
Thanks for choosing the SafeStream Gigabit Dual-WAN VPN Router TL-ER6120.
2.1 Overview of the Router
The SafeStream Gigabit Dual-WAN VPN Router TL-ER6120 from TP-LINK possesses excellent data
processing capability and multiple powerful functions including IPsec/PPTP/L2TP VPN, Load Balance,
Access Control, Bandwidth Control, Session Limit, IM/P2P Blocking, PPPoE Server and so on, which
consumedly meet the needs of small and medium enterprise, hotels and communities with volumes of
users demanding a efficient and easy-to-manage network with high security.
Powerful Data Processing Capability
+ Built-in MIPS64 network processor and 128MB DDRII high-speed RAM allows the stability and
reliability for operation.
Virtual Private Network (VPN)
+ Providing comprehensive IPsec VPN with DES/3DES/AES encryptions, MD5/SHA1
identifications and automatically/manually IKE Pre-Share Key exchanges.
+ Supporting PPTP/L2TP VPN Server mode to allow the staff on business or remote branch office
to access the headquarter network.
Online Behavior Management
+ Complete Functions of Access Rules can allow managers to select the network service levels to
block or allow applications of FTP downloading, Email, Web browsing and so on.
+ Deploying One-Click restricting of IM/P2P applications to save time & energy while reserving
exceptional groups for certain users.
+ Supporting URL Filtering to prevent potential hazards from visiting the malicious Web sites.
Powerful Firewall
+ Supporting One-Click IP-MAC Binding to avoid ARP spoofing and guarantee a network without
stagnation.
+ Featured Attack Defense to protect the network from a variety of flood attack and packet
anomaly attack.
+ Possessing MAC Filtering function to block the access of illegal hosts.
Flexible Traffic Control
+ Featured Bandwidth Control with flexible bandwidth management to automatically control the
bandwidth of the host in bi-direction to avoid bandwidth over occupation, as well as optimize
bandwidth usage.
+ Supporting Session Limit to avoid the complaint of a few people to force whole sessions.

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Dual-WAN Ports
+ Providing two 10/100/1000M WAN ports for users to connect two Internet lines for bandwidth
expansion.
+ Supporting multiple Load Balance modes, including Bandwidth Based Balance Routing,
Application Optimized Routing, and Policy Routing to optimize bandwidth usage.
+ Featured Link Backup to switch all the new sessions from dropped line automatically to another
for keeping an always on-line network.
Easy-to-use
+ Providing easy-to-use GUI with clear configuration steps and detailed help information for the
users to configure the router simply.
+ Helping administrators to monitor the whole network status and take actions to malfunctions
according to the recorded log information.
+ Supporting remote management to manage the router from remote places.
2.2 Features
Hardware
2 gigabit WAN ports, 2 gigabit LAN ports, 1 gigabit LAN/DMZ port and 1 Console port
Built-in high-quality power supply with non-fun system design for quietness
Possesses standard-sized, 19-inch outfit for standard rack
Supports Professional 4kV common mode lightning protection
Complies with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab standards
Supports AH, ESP, IKE, PPP protocols
Supports TCP/IP, DHCP, ICMP, NAT, NAPT protocols
Supports PPPoE, SNTP, HTTP, DDNS, UPnP, NTP protocols
Basic Functions
Supports Static IP, Dynamic IP, PPPoE/Russian PPPoE, L2TP/Russian L2TP, PPTP/Russian
PPTP, Dual Access, BigPond Internet connections
Supports Virtual Server, Port Triggering, ALG, Static Route and RIP v1/v2
Built-in Switch supporting Port Mirror, Port VLAN, Rate Control and so on
Supports to change the MAC address of LAN, WAN, DMZ port
Supports Logs, Statistics, Time setting
Supports Remote and Web management

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Supports Diagnostic (Ping/Tracert) and Online Detection
VPN
Supports IPsec VPN and provides up to 100 IPsec VPN tunnels
Supports IPSec VPN in LAN-to-LAN or Client-to-LAN
Provides DES, 3DES, AES128, AES152, AES256 encryption, MD5, SHA1 authentication
Supports IKE Pre-Share Key and DH1/DH2/DH5 Key Exchanges
Supports PPTP/L2TP Server/Client
Traffic Control
Supports Bandwidth Control
Supports Session Limit
Security
Built-in firewall supporting URL/MAC Filtering
Supports Access Control
Supports Attack Defense
Supports IP-MAC Binding
Supports GARP (Gratuitous ARP)
Deploys One-Click restricting of IM/P2P applications
2.3 Appearance
2.3.1 Front Panel
The front panel of TL-ER6120 is shown as the following figure.
LEDs
LED Status Indication
On The router is powered on
PWR
Off The router is powered off or power supply is abnormal

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LED Status Indication
Flashing The router works properly
SYS
ffOn/O The router works improperly
On There is a device linked to the corresponding port
Off There is no device linked to the corresponding port
Link/Act
ceiving dataFlashing The corresponding port is transmitting or re
On (Green) The linked device is running at 1000Mbps
On (Yellow) The linked device is running at 100Mbps
Speed
There is no device linked to the corresponding port or the
Off linked device is running at 10Mbps
On The port is working in DMZ mode
DMZ
The port is working in LAN modeOff
escriptionInterface D
Interface Port Description
WAN 1~2 The WAN port is for connecting the router to a DSL/Cable
modem or Ethernet by the RJ45 cable
LAN 1~3 The LAN port is for connecting the router to the local PCs or
switches by the RJ45 cable
DMZ 3 The DMZ port is for connecting the router to the servers
Console N/A The Console port is for connecting with the serial port of a
computer or terminal to monitor and configure the router
Reset button
Use the button to restore the router to the factory defaults. With the router powered on, use a pin to
press and hold the Reset button (about 4~5 seconds). After the SYS LED goes out, release the Reset
a high frequency about two or three seconds, it means the router
The rear panel of TL-ER6120 is shown as the following figure.
button. If the SYS LED is flashing with
is restored successfully.
2.3.2 Rear Panel

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Power Socket
Connect the female connector of the power cord to this power socket, and the male connector to the AC
power outlet. Please make sure the voltage of the power supply meets the requirement of the input
voltage (100-240V~ 50/60Hz).
Grounding Terminal
nism. You can also ground the router through
the PE (Protecting Earth) cable of AC cord or with Ground Cable.
The router already comes with lightning protection mecha
Note:
Please use only the power cord provided with this router.

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Chapter 3 Configuration
3.1 Network
3.1.1 Status
The Status page shows the system information, the port connection status and other information
related to this router.
Choose the menu Network→Status to load the following page.
Figure 3-1 Status
3.1.2 System Mode
The TL-ER6120 can work in three modes: NAT, Non-NAT and Classic.
If your router is hosting your local network’s connection to the Internet with a network topology as the
Figure 3-2 shown, you can set it to NAT mode.

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Figure 3-2 Network Topology - NAT Mode
If your router is connecting the two networks of different areas in a large network environment with a
network topology as the Figure 3-3 shown, and forwards the packets between these two networks by
the Routing rules, you can set it to Non-NAT mode.
Figure 3-3 Network Topology – Non-NAT Mode
If your router is connected in a combined network topology as the Figure 3-4 shown, you can set it to
Classic Mode.

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Figure 3-4 Network Topology – Classic Mode
Choose the menu Network→System Mode to load the following page.
Figure 3-5 System Mode
You can select a System Mode for your router according to your network need.
NAT Mode
NAT (Network Address Translation) mode allows the router to translate private IP addresses within
internal networks to public IP addresses for traffic transport over external networks, such as the
Internet. Incoming traffic is translated back for delivery within the internal network. However, the router
will drop all the packets whose source IP addresses are in different subnet of LAN port. For example: If
the LAN port of the router is set to 192.168.0.1 for IP address and 255.255.255.0 for the Subnet Mask,
then the subnet of LAN port is 192.168.0.0/24. The packet with 192.168.0.123 as its source IP address
can be transported by NAT, whereas the packet with 20.31.76.80 as its source IP address will be
dropped.
Non-NAT Mode
In this mode, the router functions as the traditional Gateway and forwards the packets via routing
protocol. The Hosts in different subnets can communicate with one another via the routing rules
whereas no NAT is employed. For example: If the DMZ port of the router is in WAN mode, the Hosts in
the subnet of DMZ port can access the servers in Internet only when the Static router rules permit.

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Note:
In Non-NAT mode, all the NAT forwarding rules will be disabled.
Classic Mode
It's the combined mode of NAT mode and Non-NAT mode. In Classic mode, the router will first
transport the packets which are compliant with NAT forwarding rules and then match the other packets
to the static routing rules. The matched packets will be transmitted based on the static routing rules
and the unmatched ones will be dropped. In this way, the router can implement NAT for the packets
without blocking the packets in the different subnet of the ports.
3.1.3 WAN
TL-ER6120 provides the following six Internet connection types: Static IP, Dynamic IP, PPPoE/Russian
PPPoE, L2TP/Russian L2TP, PPTP/Russian PPTP and BigPond. To configure the WAN, please first
select the type of Internet connection provided by your ISP (Internet Service Provider).
Tips:
It’s allowed to set the IP addresses of both the WAN ports within the same subnet. However, to
guarantee a normal communication, make sure that the WAN ports can access the same network,
such as Internet or a local area network.
Choose the menu Network→WAN to load the configuration page.
1) Static IP
If a static IP address has been provided by your ISP, please choose the Static IP connection type to
configure the parameters for WAN port manually.
Figure 3-6 WAN – Static IP
The following items are displayed on this screen:

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Static IP
Connection Type: Select Static IP if your ISP has assigned a static IP address for your
computer.
IP Address: Enter the IP address assigned by your ISP. If you are not clear,
please consult your ISP.
Subnet Mask: Enter the Subnet Mask assigned by your ISP.
Default Gateway: Optional. Enter the Gateway assigned by your ISP.
MTU: MTU (Maximum Transmission Unit) is the maximum data unit
transmitted by the physical network. It can be set in the range of
576-1500. The default MTU is 1500. It is recommended to keep the
default value if no other MTU value is provided by your ISP.
Primary DNS: Enter the IP address of your ISP’s Primary DNS (Domain Name
Server). If you are not clear, please consult your ISP. It’s not allowed
to access the Internet via domain name if the Primary DNS field is
blank.
Secondary DNS: Optional. If a Secondary DNS Server address is available, enter it.
Upstream Bandwidth: Specify the bandwidth for transmitting packets on the port.
Downstream
Bandwidth:
Specify the bandwidth for receiving packets on the port.
2) Dynamic IP
If your ISP (Internet Service Provider) assigns the IP address automatically, please choose the
Dynamic IP connection type to obtain the parameters for WAN port automatically.

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Figure 3-7 WAN – Dynamic IP
The following items are displayed on this screen:
Dynamic IP
Connection Type: Select Dynamic IP if your ISP assigns the IP address automatically.
Click <Obtain> to get the IP address from your ISP’s server. Click
<Release> to release the current IP address of WAN port.
Host Name: Optional. This field allows you to give a name for the router. It's
blank by default.
MTU: MTU (Maximum Transmission Unit) is the maximum data unit
transmitted by the physical network. It can be set in the range of
576-1500. The default MTU is 1500. It is recommended to keep the
default value if no other MTU value is provided by your ISP.
Get IP Address by
Unicast:
The broadcast requirement may not be supported by a few ISPs.
Select this option if you can not get the IP address from your ISP
even if with a normal network connection. This option is not
required generally.