Virtual Private Networks (VPN) IPsec
Digi Connect IT® 16/48 User Guide
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9. (Optional) Enable Force UDP encapsulation to force the tunnel to use UDP encapsulation even
when it does not detect that NAT is being used.
10. For Zone, select the firewall zone for the IPsec tunnel. Generally this should be left at the
default of IPsec.
Note Depending on your network configuration, you may need to add a packet filtering rule to
allow incoming traffic. For example, for the IPsec zone:
a. Click to expand Firewall > Packet filtering.
b. For Add packet filter, click .
c. For Label, type Allow incoming IPsec traffic.
d. For Source zone, select IPsec.
Leave all other fields at their default settings.
11. For Metric, enter or select the priority of routes associated with this IPsec tunnel. When more
than one active route matches a destination, the route with the lowest metric is used.
The metric can also be used in tandem with SureLink to configure IPsec failover behavior. See
Configure IPsec failover for more information.
12. Select the Mode, either:
n Tunnel: The entire IP packet is encrypted and/or authenticated and then encapsulated
as the payload in a new IP packet.
n Transport: Only the payload of the IP packet is encrypted and/or authenticated. The IP
header is unencrypted.
13. Select the Protocol, either:
n ESP (Encapsulating Security Payload): Provides encryption as well as authentication and
integrity.
n AH (Authentication Header): Provides authentication and integrity only.
14. Click to expand Authentication.
a. For Authentication type, select one of the following:
n Pre-shared key: Uses a pre-shared key (PSK) to authenticate with the remote
peer.
i. Type the Pre-shared key.
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