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221
C
HAPTER
20
VPN
20.1
Overview
A virtual private network (VPN) provides secure communications over the the Internet. Internet
Protocol Security (IPSec) is a standards-based VPN that provides confidentiality, data integrity, and
authentication. This chapter shows you how to configure the Device’s VPN settings.
20.2
The IPSec VPN General Screen
Use this screen to view and manage your VPN tunnel policies. The following figure helps explain the
main fields in the web configurator.
Figure 135
IPSec Fields Summary
Click
Security > IPSec VPN
to open this screen as shown next.
Figure 136
Security > IPSec VPN
Local Network
Remote Network
VPN Tunnel
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This screen contains the following fields:
20.3
The IPSec VPN Add/Edit Screen
Use these settings to add or edit VPN policies. Click the
Add New Connection
button in the
Security > VPN
screen to open this screen as shown next.
Table 103
Security > IPSec VPN
LABEL
DESCRIPTION
Add New
Connection
Click this button to add an item to the list.
#
This displays the index number of an entry.
Status
This displays whether the VPN policy is enabled (
Enable
) or not (
Disable
).
Connection Name
The name of the VPN policy.
Remote Gateway
This is the IP address of the remote IPSec router in the IKE SA.
Local Addresses
This displays the IP address(es) on the LAN behind your Device.
Remote
Addresses
This displays the IP address(es) on the LAN behind the remote IPSec’s router.
Delete
Click the
Edit
icon to modify the VPN policy.
Click the
Delete
icon to delete the VPN policy.
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Figure 137
Security > IPSec VPN: Add/Edit
This screen contains the following fields:
Table 104
Security > IPSec VPN: Add/Edit
LABEL
DESCRIPTION
Active
Select this to activate this VPN policy.
IPSec Connection
Name
Enter the name of the VPN policy.
Remote IPSec
Gateway Address
Enter the IP address of the remote IPSec router in the IKE SA.
Tunnel access
from local IP
addresses
Select
Single Address
to have only one local LAN IP address use the VPN tunnel. Select
Subnet
to specify local LAN IP addresses by their subnet mask.
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IP Address for
VPN
If
Single Address
is selected, enter a (static) IP address on the LAN behind your Device.
If
Subnet
is selected, specify IP addresses on a network by their subnet mask by entering
a (static) IP address on the LAN behind your Device.
Then enter the subnet mask to
identify the network address.
IP Subnetmask
If
Subnet
is selected, enter the subnet mask to identify the network address.
Tunnel access
from remote IP
addresses
Select
Single Address
to have only one remote LAN IP address use the VPN tunnel.
Select
Subnet
to specify remote LAN IP addresses by their subnet mask.
IP Address for
VPN
If
Single Address
is selected, enter a (static) IP address on the LAN behind the remote
IPSec’s router.
If
Subnet
is selected, specify IP addresses on a network by their subnet mask by entering
a (static) IP address on the LAN behind the remote IPSec’s router.
Then enter the subnet
mask to identify the network address.
IP Subnetmask
If
Subnet
is selected, enter the subnet mask to identify the network address.
Protocol
Select which protocol you want to use in the IPSec SA. Choices are:
AH
(RFC 2402) - provides integrity, authentication, sequence integrity (replay
resistance), and non-repudiation but not encryption. If you select
AH
, you must select an
Integraty
Algorithm
.
ESP
(RFC 2406) - provides encryption and the same services offered by
AH
, but its
authentication is weaker. If you select
ESP
, you must select an
Encryption Agorithm
and
Integraty Algorithm
.
Both
AH
and
ESP
increase processing requirements and latency (delay). The Device and
remote IPSec router must use the same active protocol.
Key Exchange
Method
Select the key exchange method:
Auto(IKE)
- Select this to use automatic IKE key management VPN connection policy.
Manual
- Select this option to configure a VPN connection policy that uses a manual key
instead of IKE key management. This may be useful if you have problems with IKE key
management.
Note: Only use manual key as a temporary solution, because it is not as secure as a regular
IPSec SA.
Authentication
Method
Select
Pre-Shared Key
to use a pre-shared key for authentication, and type in your pre-
shared key. A pre-shared key identifies a communicating party during a phase 1 IKE
negotiation. It is called "pre-shared" because you have to share it with another party
before you can communicate with them over a secure connection.
Select
Certificate (X.509)
to use a certificate for authentication.
Pre-Shared Key
Type your pre-shared key in this field. A pre-shared key identifies a communicating party
during a phase 1 IKE negotiation.
Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62 hexadecimal ("0-9",
"A-F") characters. You must precede a hexadecimal key with a "0x” (zero x), which is not
counted as part of the 16 to 62 character range for the key. For example, in
"0x0123456789ABCDEF", “0x” denotes that the key is hexadecimal and
“0123456789ABCDEF” is the key itself.
Local ID Type
Select
IP
to identify the Device by its IP address.
Select
E-mail
to identify this Device by an e-mail address.
Select
DNS
to identify this Device by a domain name.
Select
ASN1DN
(Abstract Syntax Notation one - Distinguished Name) to this Device by
the subject field in a certificate. This is used only with certificate-based authentication.
Table 104
Security > IPSec VPN: Add/Edit
LABEL
DESCRIPTION
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Local ID Content
When you select IP in the
Local ID Type
field, type the IP address of your computer in
this field. If you configure this field to 0.0.0.0 or leave it blank, the Device automatically
uses the
Pre-Shared Key
(refer to the
Pre-Shared Key
field description).
It is recommended that you type an IP address other than 0.0.0.0 in this field or use the
DNS
or
E-mail
type in the following situations.
When there is a NAT router between the two IPSec routers.
When you want the remote IPSec router to be able to distinguish between VPN
connection requests that come in from IPSec routers with dynamic WAN IP addresses.
When you select
DNS
or
E-mail
in the
Local ID Type
field, type a domain name or e-
mail address by which to identify this Device in this field. Use up to 31 ASCII characters
including spaces, although trailing spaces are truncated. The domain name or e-mail
address is for identification purposes only and can be any string.
Remote ID Type
Select
IP
to identify the remote IPSec router by its IP address.
Select
E-mail
to identify the remote IPSec router by an e-mail address.
Select
DNS
to identify the remote IPSec router by a domain name.
Select
ASN1DN
to identify the remote IPSec router by the subject field in a certificate.
This is used only with certificate-based authentication.
Remote ID
Content
The configuration of the remote content depends on the remote ID type.
For
IP
, type the IP address of the computer with which you will make the VPN connection.
If you configure this field to 0.0.0.0 or leave it blank, the Device will use the address in
the
Remote IPSec Gateway Address
field (refer to the
Remote IPSec Gateway
Address
field description).
For
DNS
or
E-mail
, type a domain name or e-mail address by which to identify the
remote IPSec router. Use up to 31 ASCII characters including spaces, although trailing
spaces are truncated. The domain name or e-mail address is for identification purposes
only and can be any string.
It is recommended that you type an IP address other than 0.0.0.0 or use the
DNS
or
E-
mail
ID type in the following situations:
When there is a NAT router between the two IPSec routers.
When you want the Device to distinguish between VPN connection requests that come
in from remote IPSec routers with dynamic WAN IP addresses.
Advanced IKE
Settings
Click
more
to display advanced settings. Click
less
to display basic settings only.
NAT_Traversal
Select
Enable
if you want to set up a VPN tunnel when there are NAT routers between the
Device and remote IPSec router. The remote IPSec router must also enable NAT traversal,
and the NAT routers have to forward UDP port 500 packets to the remote IPSec router
behind the NAT router. Otherwise, select
Disable
.
Phase 1
Mode
Select the negotiation mode to use to negotiate the IKE SA. Choices are:
Main
- this encrypts the Device’s and remote IPSec router’s identities but takes more
time to establish the IKE SA.
Aggressive
- this is faster but does not encrypt the identities.
The Device and the remote IPSec router must use the same negotiation mode.
Table 104
Security > IPSec VPN: Add/Edit
LABEL
DESCRIPTION

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