Allied Telesis AR440S manual How to configure VPNs in typical corporate networks, Vlan

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How to configure VPNs in typical corporate networks

This section describes a typical corporate network using secure VPN. The network consists of a headquarters (HQ) router and two branch office routers. The headquarters router is acting as a VPN Access Concentrator, and allows for VPN access from either of the branch office sites or from roaming laptop VPN clients. The network is illustrated in the following figure.

 

 

branch office 1

Telco’s ADSL

 

ISP’s

 

headquarters

 

 

 

 

 

VPN router

 

exchange

 

router

 

VPN access

 

 

 

 

VLAN 1

 

 

 

 

 

 

 

 

 

 

 

 

concentrator

 

 

 

 

222.222.222.1

 

 

 

222.222.222.254

200.200.200.254

192.168.140.254

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

192.168.141.254

 

 

 

 

 

 

 

 

200.200.200.1

 

 

 

 

 

corporate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

211.211.211.254

 

 

 

 

 

 

 

 

 

 

LAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pool of addresses available

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for roaming clients:

 

 

 

 

 

branch office 2

 

 

 

 

 

 

211.211.211.1

 

 

192.168.143.1-50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

dynamically

 

 

 

hotel’s NAT gateway

 

 

 

 

 

 

 

 

 

 

 

 

 

192.168.142.254

 

assigned

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

192.168.200.254

 

 

 

 

 

 

 

 

 

 

 

VLAN 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

roaming VPN client

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

physical address: 192.168.200.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VPN tunnel address from pool: 192.168.143.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vpn-corporate.eps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Branch office 1 uses the PPPoA ADSL link type, and branch office 2 uses the PPPoEoA ADSL link type. We have done this to illustrate these two commonly used ADSL link types. For information about the ADSL link type you need, see your ADSL provider.

This How To Note gives you the commands for configuring each of the following:

1.The headquarters VPN access concentrator router, which includes: z an ethernet connection to the Internet

z a fixed Internet address. This means that the branch offices and the roaming VPN clients have a known target for the headquarters end of the VPN

z VPN access to and from branch office 1. This can be initiated from the headquarters or branch office end. This is a site-to-site VPN and uses IPsec tunnel mode (see "Background: NAT-T and policies" on page 4).

z VPN access from branch office 2. This can only be initiated from the branch office end, because the branch office has a dynamically-assigned IP address. This also uses IPsec tunnel mode.

z VPN client access from roaming users on Windows 2000 and Windows XP. This is provided by using IPsec transport mode with L2TP (see "About IPsec modes: tunnel and transport" on page 3)

z optionally, prioritisation of voice (VoIP) traffic for these VPN clients by using Software Quality of Service (SQoS). If the VPN clients use VoIP to establish voice calls via the headquarters network, this helps maintain voice quality.

Page 6 AlliedWare™ OS How To Note: VPNs for Corporate Networks

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Contents Contents IntroductionRelated How To Notes About IPsec modes tunnel and transport L2TPBackground NAT-T and policies Internet5 AlliedWare OS How To Note VPNs for Corporate Networks How to configure VPNs in typical corporate networks VlanBefore you start ATM DslamHow to configure the headquarters VPN access concentrator Configure general system and user settingsConfigure IP for internet access Configure remote management access, if desiredConfigure dynamic PPP over L2TP connections Capture status information remotely, if desiredCheck feature licences Enable Isakmp Configure the firewall’s basic settings Configure the firewall’s access rules Save your configuration How to configure the AR440S router at branch office Configure Adsl for internet access Configure PPP for PPPoAConfigure IP 18 AlliedWare OS How To Note VPNs for Corporate Networks Create ip pool=roaming ip=192.168.144.1-192.168.144.50 Create ipsec pol=internet int=ppp0 ac=permit Add firewall policy=branch1 int=vlan1 type=private 22 AlliedWare OS How To Note VPNs for Corporate Networks 23 AlliedWare OS How To Note VPNs for Corporate Networks Set system name=Branch2 Configure PPP for PPPoE 26 AlliedWare OS How To Note VPNs for Corporate Networks Configure the VPNs for connecting to the headquarters office Enable isakmp 29 AlliedWare OS How To Note VPNs for Corporate Networks How to make voice traffic high priority Create classifiers Reduce the MTUFor site-to-site VPNs, apply the SQoS policy to the tunnels For roaming clients, set L2TP TOS reflectionSet int=ppp0 mtu=256 34 AlliedWare OS How To Note VPNs for Corporate Networks Apply the SQoS policy to the tunnel How to test your VPN solution LANs areConfiguration scripts for headquarters and branch offices Before you use these scriptsHeadquarters VPN access concentrators configuration # Log configuration # Dhcp configuration# SSH configuration # Ipsec configuration# Isakmp Configuration # Firewall configuration # Software QoS configuration if prioritising VoIP # INT configuration if prioritising VoIP# Classifier configuration if prioritising VoIP # Trigger configuration if prioritising VoIP# ATM configuration # Adsl configuration# PPP configuration for PPPoA 44 AlliedWare OS How To Note VPNs for Corporate Networks 45 AlliedWare OS How To Note VPNs for Corporate Networks 46 AlliedWare OS How To Note VPNs for Corporate Networks Set int=ppp0 mtu=256 Set int=ppp0 frag=yes # ETH configuration # PPP configuration for PPPoE49 AlliedWare OS How To Note VPNs for Corporate Networks 50 AlliedWare OS How To Note VPNs for Corporate Networks 51 AlliedWare OS How To Note VPNs for Corporate Networks ISPs PPPoE access concentrator configuration # PPP templates configuration# PPP configuration Hotels NAT gateway firewall configuration # Firewall configuration enable firewall
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AR440S specifications

Allied Telesis offers a range of advanced routers designed to meet the connectivity and operational needs of modern enterprises. Among its extensive lineup, the AR450S, AR441S, AR415S, AR442S, and AR440S models stand out for their robust features and technologies, making them ideal solutions for various networking environments.

The Allied Telesis AR450S is a high-performance router tailored for service providers and large enterprises. It supports advanced routing protocols, including IPv4 and IPv6, ensuring compatibility with both legacy and modern networks. The AR450S boasts substantial throughput capabilities, making it suitable for bandwidth-intensive applications. Its versatile WAN options, including Ethernet and cellular connectivity, allow seamless integration into diverse network architectures.

Next in the lineup is the AR441S, which focuses on providing enhanced security and reliability. With built-in firewall capabilities and VPN support, this model ensures secure communication over the internet. The AR441S also features numerous Ethernet ports for flexible connectivity, enabling organizations to scale their networks as needed. Its user-friendly interface facilitates straightforward configuration and management.

The AR415S is designed for branch offices and small to medium-sized enterprises. This router offers a balance of performance and affordability, equipped with essential features like Quality of Service (QoS) and traffic shaping. The AR415S supports multiple WAN connections, which helps in maintaining reliable internet access by auto-failing to backup connections when necessary.

The AR442S incorporates advanced networking technologies, including dynamic routing protocols and deep packet inspection. This model enhances performance by optimizing traffic flow and improving bandwidth utilization. Its support for VoIP and other multimedia applications makes it an excellent choice for organizations seeking to maximize their communication capabilities.

Lastly, the AR440S is engineered for high availability and redundancy. It includes dual power supplies and hot-swappable components, ensuring that network services remain uninterrupted during maintenance. The AR440S is particularly valuable in mission-critical environments where downtime can lead to significant business disruption.

In summary, the Allied Telesis AR series routers—AR450S, AR441S, AR415S, AR442S, and AR440S—offer a rich set of features tailored to various operational needs. With their advanced routing capabilities, security features, and reliable performance, these routers represent the cutting edge of networking technology for businesses looking to enhance their connectivity and operational efficiency.
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