User's Manual

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Configuring Virtual Private Networks (VPNs) and Security
Configuring VPNs
Cisco RV180/RV180W Administration Guide 108
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DRAFT - CISCO CONFIDENTIAL
NOTE: The double quote character (“) is not supported in the pre-shared key.
STEP 4 Choose the Diffie-Hellman (DH) Group algorithm, which is used when exchanging
keys. The DH Group sets the strength of the algorithm in bits.
NOTE: Ensure that the DH Group is configured identically on both sides of the IKE
policy.
STEP 5 In the SA Lifetime field, enter the interval, in seconds, after which the Security
Association becomes invalid.
STEP 6 To enable dead peer detection, check the Enable box. Dead Peer Detection is
used to detect whether the peer is alive or not. If peer is detected as dead, the
router deletes the IPsec and IKE Security Association.
STEP 7 In the Detection Period field, enter the interval, in seconds, between consecutive
DPD R-U-THERE messages. DPD R-U-THERE messages are sent only when the
IPsec traffic is idle.
STEP 8 In the Reconnect after Failure Count field, enter the maximum number of DPD
failures allowed before tearing down the connection.
Extended Authentication (XAUTH) Parameters
Rather than configuring a unique VPN policy for each user, you can enable the VPN
gateway router to authenticate users from a stored list of user accounts or with an
external authentication server such as a RADIUS server. When connecting many
VPN clients to a VPN gateway router, Extended Authentication (XAUTH) allows
authentication of users with methods in addition to the authentication method
mentioned in the IKE SA parameters. XAUTH can be configured in the following
modes:
STEP 1 Select the XAUTH type:
None—Disables XAUTH.
Edge Device—Authentication is done by one of the following:
- User Database—User accounts created in the router are used to
authenticate users. See Configuring VPN Users, page 115.
- RADIUS-PAP—Authentication is done using a RADIUS server and
password authentication protocol (PAP).
- RADIUS-CHAP—Authentication is done using a RADIUS server and
challenge handshake authentication protocol (CHAP).