FortiGate IPSec VPN User Guide - FirewallShop.com

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Configuration overview Gateway-to-gateway configurations You can set up a fully meshed or partially meshed configuration (see Figure 2 and Figure 3). Figure 2: Fully meshed configuration Fully meshed FortiGate_2 FortiGate_3 FortiGate_1 FortiGate_4 FortiGate_5 In a fully meshed network, all VPN peers are connected to each other, with one hop between peers. This topology is the most fault-tolerant: if one peer goes down, the rest of the network is not affected. This topology is difficult to scale because it requires connections between all peers. In addition, unnecessary communication can occur between peers. We recommend a hub-and-spoke configuration instead (see “Hub-and-spoke configurations” on page 33). Figure 3: Partially meshed configuration Paritally meshed FortiGate_2 FortiGate_3 FortiGate_1 FortiGate_4 FortiGate_5 A partially meshed network is similar to a fully meshed network, but instead of having tunnels between all peers, tunnels are only configured between peers that communicate with each other regularly. Gateway-to-gateway infrastructure requirements • The FortiGate units at both ends of the tunnel must be operating in NAT/Route mode and have static public IP addresses. FortiGate IPSec VPN Version 3.0 User Guide 20 01-30005-0065-20070716
Gateway-to-gateway configurations General configuration steps General configuration steps When a FortiGate unit receives a connection request from a remote VPN peer, it uses IPSec phase 1 parameters to establish a secure connection and authenticate the VPN peer. Then, if the firewall policy permits the connection, the FortiGate unit establishes the tunnel using IPSec phase 2 parameters and applies the IPSec firewall policy. Key management, authentication, and security services are negotiated dynamically through the IKE protocol. To support these functions, the following general configuration steps must be performed both FortiGate units: • Define the phase 1 parameters that the FortiGate unit needs to authenticate the remote peer and establish a secure connection. • Define the phase 2 parameters that the FortiGate unit needs to create a VPN tunnel with the remote peer. • Create firewall policies to control the permitted services and permitted direction of traffic between the IP source and destination addresses. For more information, see “Configure the VPN peers” below. Configure the VPN peers Configure the VPN peers as follows: 1 At the local FortiGate unit, define the phase 1 configuration needed to establish a secure connection with the remote peer. See “Auto Key phase 1 parameters” on page 127. Enter these settings in particular: Name Remote Gateway IP Address Local Interface Enable IPSec Interface Mode Enter a name to identify the VPN tunnel. This name appears in phase 2 configurations, firewall policies and the VPN monitor. Select Static IP Address. Type the IP address of the remote peer public interface. Select the FortiGate unit’s public interface. You must select Advanced to see this setting. If IPSec Interface Mode is enabled, the FortiGate unit creates a virtual IPSec interface for a route-based VPN. Disable this option if you want to create a policy-based VPN. For more information, see “Choosing policy-based or route-based VPNs” on page 16. After you select OK to create the phase 1 configuration, you cannot change this setting. 2 Define the phase 2 parameters needed to create a VPN tunnel with the remote peer. See “Phase 2 parameters” on page 143. Enter these settings in particular: Name Phase 1 Enter a name to identify this phase 2 configuration. Select the name of the phase 1 configuration that you defined. 3 Define names for the addresses or address ranges of the private networks that the VPN links. These addresses are used in the firewall policies that permit communication between the networks. For more information, see “Defining firewall addresses” on page 149. Enter these settings in particular: • Define an address name for the IP address and netmask of the private network behind the local FortiGate unit. FortiGate IPSec VPN Version 3.0 User Guide 01-30005-0065-20070716 21
Page 1 and 2: USER GUIDE FortiGate IPSec VPN Vers
Page 3 and 4: Contents Contents Introduction ....
Page 5 and 6: Contents Adding XAuth authenticatio
Page 7 and 8: Contents Defining IKE negotiation p
Page 9 and 10: Introduction About FortiGate IPSec
Page 11 and 12: Introduction About this document
Page 13 and 14: Introduction Fortinet documentation
Page 15 and 16: Configuring IPSec VPNs IPSec VPN ov
Page 17 and 18: Configuring IPSec VPNs General prep
Page 19: Gateway-to-gateway configurations C
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Page 33 and 34: Hub-and-spoke configurations Config
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Page 49 and 50: Dynamic DNS configurations Configur
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FortiGate dialup-client configurati
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Internet-browsing configuration Con
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Internet-browsing configuration Rou
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Redundant VPN configurations Config
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Redundant VPN configurations Config
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Redundant VPN configurations Redund
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Redundant VPN configurations Partia
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Transparent mode VPNs Configuration
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Transparent mode VPNs Configuration
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Transparent mode VPNs Configure the
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Manual-key configurations Configura
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Manual-key configurations Specify t
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IPv6 IPSec VPNs Overview of IPv6 IP
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IPv6 IPSec VPNs Site-to-site IPv6 o
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Auto Key phase 1 parameters Overvie
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Auto Key phase 1 parameters Authent
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Auto Key phase 1 parameters Definin
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Auto Key phase 1 parameters Definin
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Auto Key phase 1 parameters Using X
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Phase 2 parameters Basic phase 2 se
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Phase 2 parameters Advanced phase 2
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Configure the phase 2 parameters Ph
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Defining firewall policies Defining
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Monitoring VPN connections Monitori
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Logging VPN events Monitoring and t
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VPN troubleshooting tips Monitoring
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Index Encryption Algorithm, Manual
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Index remote peer authenticating wi
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