Citrix SD-WAN

How to configure IPsec tunnel between SD-WAN and third-party devices

To configure IPsec tunnel for intranet or LAN service:

  1. In the Configuration Editor, navigate to Connections > View Site > [Site Name] > IPsec Tunnels. Choose a Service Type (LAN or Intranet).

  2. Enter a Name for the service type. For Intranet service type, the configured Intranet Server determines which Local IP addresses are available.

    Local IP

    Citrix SD-WAN can now establish IPsec tunnels when a WAN link is directly terminated on the appliance and a dynamic IP is being assigned to the WAN link.

    With 11.1.0 release, Intranet IPsec tunnels must be configurable when the local tunnel IP address is not or cannot be known. This helps in creating IPsec tunnels on the interfaces whose address is assigned through DHCP.

    While configuring interface for IPsec tunnel, a local tunnel IP must be mentioned. This interface is modified to allow an empty IP to be selected when the tunnel type is Intranet.

    Additionally, the label for an unset address is changed to Auto when the tunnel type is Intranet.

    If the Local IP is set as Auto, it has the ability of taking IP address that is incorporated for the access interface on that WAN link. That WAN link access interface might get IP either statically configured or from DHCP. IPsec tunnel is established using the primary WAN link access interface by default.

    Earlier, you can establish IPsec tunnels over a single WAN link. This exposes the branch environment to service loss during periods of outright link failures and when packet loss on a link is inadvertently high to allow for reliable connectivity.

    From 11.1.0 release onwards, you can use two WAN links for establishing IPsec tunnels in order to guard branch environments against periods of service disruption. If the primary link goes down, the secondary link turns active/up within milliseconds.

    Note

    When the <Auto> option is selected, IPsec tunnel is established using the primary WAN link access interface. If the primary wan link goes down IPsec tunnel is established using the secondary WAN link access interface.

    Two WAN links

  3. Select the available Local IP address and enter the Peer IP address of the IPsec tunnel.

    Sites intranet settings IPsec

    IPsec tunnel types

    IPsec intranet tunnel types

    Note

    If the Service Type is Intranet, the IP address is pre-determined by the chosen Intranet Service.

    Sites LAN settings

  4. Configure IPsec settings by applying the criteria described in the following tables. When finished, click Apply to save your settings.

Field Description Value
Service Type Choose a service type from the drop-down menu Intranet, LAN
Name If the service type is Intranet, choose from the list of configured intranet services in the drop-down menu. If the service type is LAN, enter a unique name Text string
Local IP Choose the local IP address of the IPsec Tunnel from the drop-down menu of available virtual IP addresses configured at this Site IP address
Peer IP Enter the peer IP address of the IPsec Tunnel IP address
MTU Enter the MTU for fragmenting IKE and IPsec fragments Default: 1500
IKE Settings Version: Choose an IKE version from the drop-down menu IKEv1 IKEv2
Mode Choose a mode from the drop-down menu FIPS compliant: Main, Non-FIPS compliant: Aggressive
Identity Choose an Identity from the drop-down menu Auto IP Address Manual IP Address User FQDN
Authentication Choose the authentication type from the drop-down menu Pre-Shared Key: If you are using a pre-shared key, copy and paste it into this field. Click the Eyeball () icon to view the Pre-Shared Key. Certificate: If you are using an identity certificate, choose it from the drop-down menu.
Validate Peer Identity Select this check box to validate the IKE’s peer. If the peer’s ID type is not supported, do not enable this feature None
DH Group Choose Diffie–Hellman group to use for IKE key generation from the drop-down menu Non-FIPS compliant: Group 1, FIPS-compliant: Group 2 Group 5 Group 14 Group 15 Group 16 Group 19 Group 20 Group 21
Hash Algorithm Choose an algorithm from the drop-down menu to authenticate IKE messages Non-FIPS compliant: MD5 FIPS compliant: SHA1 SHA-256
Encryption Mode Choose the Encryption Mode for IKE messages from the drop-down menu AES 128-bit AES 192-bit AES 256-bit
Lifetime (s) Enter the preferred duration, in seconds, for an IKE security association to exist 3600 seconds (default)
Lifetime (s) Max Enter the maximum preferred duration, in seconds, to allow an IKE security association to exist 86400 seconds (default)
DPD Timeout (s) Enter the Dead Peer Detection timeout, in seconds, for VPN connections 300 seconds (default)
IKEv2 Peer Authentication: Choose Peer Authentication from the drop-down menu Mirrored Pre-Shared Key Certificate
IKE2 - Pre-shared key Peer Pre-Shared Key: Paste the IKEv2 Peer Pre-Shared Key into this field for authentication. Click the eyeball () icon to view the Pre-Shared Key Text string
Integrity Algorithm Choose an algorithm as the hashing algorithm to use for HMAC verification from the drop-down menu Non-FIPS compliant: MD5 FIPS compliant: SHA1 SHA-256

Note:

If the terminating IPsec router includes Hash-based Message Authentication Code (HMAC) in the config, change the IPsec mode to EXP+Auth with a hashing algorithm as SHA1.

IKE settings IPsec tunnel

IKE2 settings IPsec tunnel

IPsec and IPsec Protected Network Settings:

Field Description Value (s)
Tunnel Type Choose the Tunnel Type from the drop-down menu ESP ESP+Auth ESP+NULL AH
PFS Group Choose Diffie–Hellman group to use for perfect forward secrecy key generation from the drop-down menu None Group 1 Group 2 Group 5 Group 14 Group 15 Group 16 Group 19 Group 20 Group 21
Encryption Mode Choose the Encryption Mode for IPsec messages from the drop-down menu If you chose ESP or ESP+ Auth, select either one of the following, AES 128-bit, AES 192-bit, AES 256-bit, AES 128-bit, GCM 64-Bit, AES 192-bit, GCM 64-Bit, AES 256-bit, GCM 64-Bit, AES 128-bit, GCM 96-Bit, AES 192-bit, GCM 96-Bit, AES 256-bit, GCM 96-Bit, AES 128-bit, GCM 128-Bit, AES 192-bit, GCM 128-Bit, AES 256-bit, GCM 128-Bit
Lifetime (s) Enter the amount of time, in seconds to allow an IPsec security association to exist 28800 seconds (default)
Lifetime Max (s) Enter the maximum amount of time, in seconds to allow an IPsec security association to exist 86400 seconds (default)
Lifetime (KB) Enter the amount of data, in kilobytes, for an IPsec security association to exist Kilobytes
Lifetime (KB) Max Enter the maximum amount of data, in kilobytes, to allow an IPsec security association to exist Kilobytes
Network Mismatch Behavior Choose the action to take if a packet does not match the IPsec Tunnel’s Protected Networks from the drop-down menu Drop, Send Unencrypted, Use Non-IPsec Route
IPsec Protected Networks Source IP/Prefix: After clicking the Add (+ Add) button, enter the Source IP and Prefix of the network traffic the IPsec Tunnel will protect IP address
IPsec Protected Networks Destination IP/Prefix: Enter the Destination IP and Prefix of the network traffic the IPsec Tunnel will protect IP address

IPsec tunnel settings

Monitor IPsec Tunnels

Navigate to Monitoring>IKE/IPsec in the SD-WAN appliance GUI to view and monitor IPsec tunnel configuration.

How to configure IPsec tunnel between SD-WAN and third-party devices