VPN Configuration
19.1 Understanding VPN Features
SCALANCE W1750D UI
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Configuration Manual, 02/2018, C79000-G8976-C451-02
Supported VPN Protocols
SCALANCE W supports the following VPN protocols for remote access:
Table 19- 1 VPN Protocols
VPN Protocol
Description
Aruba IPsec
IPsec is a protocol suite that secures IP communications by authenticating and
encrypting each IP packet of a communication session.
You can configure an IPsec tunnel to ensure that the data flow between the
networks is encrypted. However, you can configure a split-tunnel to encrypt
only the corporate traffic.
When IPsec is configured, ensure that you add the AP MAC addresses to the
whitelist database stored on the controller or an external server. IPsec supports
Local, L2, and L3 modes of AP-VPN operations.
NOTE: The APs support IPsec only with Aruba controllers.
Layer-2 (L2) GRE
Generic Routing Encapsulation (GRE) is a tunnel protocol for encapsulating
multicast, broadcast, and L2 packets between a GRE-capable device and an
endpoint. APs support the configuration of L2 GRE (Ethernet over GRE) tunnel
with an Aruba controller to encapsulate the packets sent and received by the
AP.
You can use the GRE configuration for L2 deployments when there is no en-
cryption requirement between the AP and controller for client traffic.
APs support two types of GRE configuration:
•
Manual GRE—The manual GRE configuration sends unencrypted client
traffic with an additional GRE header and does not support failover. When
manual GRE is configured on the AP, ensure that the GRE tunnel settings
are enabled on the controller.
•
Aruba GRE—With Aruba GRE, no configuration on the controller is required
except for adding the AP MAC addresses to the whitelist database stored
on the controller or an external server. Aruba GRE reduces manual configu-
ration when Per-AP tunnel configuration is required and supports failover
between two GRE endpoints.
NOTE: APs support manual and Aruba GRE configuration only for L2 mode of
operations. Aruba GRE configuration is supported only on Aruba controllers.
L2TP
The Layer 2 Tunneling Protocol version 3 (L2TPv3) feature allows the AP to act
as an L2TP Access Concentrator (LAC) and tunnel all wireless client's L2 traffic
from the AP to L2TP Network Server (LNS). In a Centralized, L2 model, the
VLAN on the corporate side is extended to remote branch sites. Wireless cli-
ents associated with an AP gets the IP address from the DHCP server running
on LNS. For this, the AP has to transparently allow DHCP transactions through
the L2TPv3 tunnel.