Specifying the mode, Nem with multiple interfaces – Cisco ASA 5505 User Manual

Page 1561

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71-3

Cisco ASA 5500 Series Configuration Guide using the CLI

Chapter 71 Configuring Easy VPN Services on the ASA 5505

Specifying the Mode

ip_primary_address is the IP address or DNS name of the primary Easy VPN server.

ip_secondary_address_n (Optional) is a list of the IP addresses or DNS names of up to ten backup Easy
VPN servers. Use a space to separate the items in the list.

For example, enter the following command to configure a VPN client to use Easy VPN Server
10.10.10.15 as the primary server, and 10.10.10.30 and 192.168.10.45 as alternate servers:

hostname(config)# vpnclient server 10.10.10.15 10.10.10.30 192.168.10.10

hostname(config)#

Specifying the Mode

The Easy VPN Client supports one of two modes of operation: Client Mode or Network Extension Mode
(NEM). The mode of operation determines whether the inside hosts relative to the Easy VPN Client are
accessible from the Enterprise network over the tunnel. Specifying a mode of operation is mandatory
before making a connection because Easy VPN Client does not have a default mode.

Client mode, also called Port Address Translation (PAT) mode, isolates the IP addresses of all devices
on the Easy VPN Client private network from those on the enterprise network. The Easy VPN Client
performs PAT for all VPN traffic for its inside hosts. IP address management is neither required for the
Easy VPN Client inside interface or the inside hosts.

NEM makes the inside interface and all inside hosts routeable across the enterprise network over the
tunnel. Hosts on the inside network obtain their IP addresses from an accessible subnet (statically or via
DHCP) pre-configured with static IP addresses. PAT does not apply to VPN traffic in NEM. This mode
does not require a VPN configuration for each client. The Cisco ASA 5505 configured for NEM mode
supports automatic tunnel initiation. The configuration must store the group name, user name, and
password. Automatic tunnel initiation is disabled if secure unit authentication is enabled.

Note

If the Easy VPN hardware client is using NEM and has connections to secondary servers, use the crypto
map set reverse-route
command on each headend device to configure dynamic announcements of the
remote network using Reverse Route Injection (RRI).

To specify the mode for Easy VPN Clients, enter the following command in configuration mode:

[no] vpnclient mode {client-mode | network-extension-mode}

no removes the command from the running configuration.

NEM with Multiple Interfaces

If you have an

ASA

5505 security appliance (version 7.2 (3) and higher) configured as an Easy VPN

Client in Network Extension Mode with multiple interfaces configured, the security appliance builds a
tunnel for locally encrypted traffic only from the interface with the highest security level.

For example, consider the following configuration:

vlan1 security level 100 nameif inside

vlan2 security level 0 nameif outside

vlan12 security level 75 nameif work

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