FortiGate IPSec VPN User Guide - FirewallShop.com

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Configuration overview Redundant VPN configurations The configuration described here assumes that your redundant VPNs are essentially equal in cost and capability. When the original VPN returns to service, traffic continues to use the replacement VPN until the replacement VPN fails. If your redundant VPN uses more expensive facilities, you want to use it only as a backup while the main VPN is down. For information on how to do this, see “Creating a backup IPSec interface” on page 104. Figure 16: Example redundant-tunnel configuration Site_1 Redundant tunnel Primary tunnel FortiGate_1 Internet Site_2 FortiGate_2 Primary tunnel Redundant tunnel Note: A VPN that is created using manual keys (see “Manual-key configurations” on page 111) cannot be included in a redundant-tunnel configuration. General configuration steps A redundant configuration at each VPN peer includes: • one phase 1 configuration (virtual IPSec interface) for each path between the two peers. In a fully-meshed redundant configuration, each network interface on one peer can communicate with each network interface on the remote peer. If both peers have two public interfaces, this means that each peer has four paths, for example. • one phase 2 definition for each phase 1 configuration • one static route for each IPSec interface, with different distance values to prioritize the routes • two Accept firewall policies per IPSec interface, one for each direction of traffic • dead peer detection enabled in each phase 1 definition The procedures in this section assume that two separate interfaces to the Internet are available on each VPN peer. FortiGate IPSec VPN Version 3.0 User Guide 84 01-30005-0065-20070716
Redundant VPN configurations Configure the VPN peers - route-based VPN Configure the VPN peers - route-based VPN Configure each VPN peer as follows: 1 Ensure that the interfaces used in the VPN have static IP addresses. 2 Create a phase 1 configuration for each of the paths between the peers. Enable IPSec Interface mode so that this creates a virtual IPSec interface. Enable dead peer detection so that one of the other paths is activated if this path fails. Enter these settings in particular: Path 1 Remote Gateway IP Address Select Static IP Address. Type the IP address of the primary interface of the remote peer. Local Interface Select the primary public interface of this peer. Enable IPSec Interface Mode Enable Dead Peer Detection Enable Other settings as required by VPN. Path 2 Remote Gateway IP Address Select Static IP Address. Type the IP address of the secondary interface of the remote peer. Local Interface Select the primary public interface of this peer. Enable IPSec Interface Mode Enable Dead Peer Detection Enable Other settings as required by VPN. Path 3 Remote Gateway IP Address Select Static IP Address. Type the IP address of the primary interface of the remote peer. Local Interface Select the secondary public interface of this peer. Enable IPSec Interface Mode Enable Dead Peer Detection Enable Other settings as required by VPN. FortiGate IPSec VPN Version 3.0 User Guide 01-30005-0065-20070716 85
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USER GUIDE FortiGate IPSec VPN Vers
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Contents Contents Introduction ....
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Contents Adding XAuth authenticatio
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Contents Defining IKE negotiation p
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Introduction About FortiGate IPSec
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Introduction About this document
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Introduction Fortinet documentation
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Configuring IPSec VPNs IPSec VPN ov
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Configuring IPSec VPNs General prep
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Gateway-to-gateway configurations C
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Gateway-to-gateway configurations G
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Gateway-to-gateway configurations H
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Gateway-to-gateway configurations H
Page 33 and 34: Hub-and-spoke configurations Config
Page 43 and 44: Hub-and-spoke configurations Dynami
Page 49 and 50: Dynamic DNS configurations Configur
Page 55 and 56: FortiClient dialup-client configura
Page 71 and 72: FortiGate dialup-client configurati
Page 79 and 80: Internet-browsing configuration Con
Page 81 and 82: Internet-browsing configuration Rou
Page 83: Redundant VPN configurations Config
Page 87 and 88: Redundant VPN configurations Redund
Page 99 and 100: Redundant VPN configurations Partia
Page 105 and 106: Transparent mode VPNs Configuration
Page 107 and 108: Transparent mode VPNs Configuration
Page 109 and 110: Transparent mode VPNs Configure the
Page 111 and 112: Manual-key configurations Configura
Page 113 and 114: Manual-key configurations Specify t
Page 115 and 116: IPv6 IPSec VPNs Overview of IPv6 IP
Page 117 and 118: IPv6 IPSec VPNs Site-to-site IPv6 o
Page 127 and 128: Auto Key phase 1 parameters Overvie
Page 129 and 130: Auto Key phase 1 parameters Authent
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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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