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1-12
Cisco ASA Series CLI Configuration Guide
Chapter 1 Configuring L2TP over IPsec
Configuring L2TP over IPsec
Creating IKE Policies to Respond to Windows 7 Proposals
Windows 7 L2TP/IPsec clients send several IKE policy proposals to establish a VPN connection with
the ASA. Define one of the following IKE policies to facilitate connections from Windows 7 VPN native
clients.
Step 15
crypto isakmp nat-traversal
seconds
Example:
hostname(config)# crypto isakmp enable
hostname(config)# crypto isakmp nat-traversal 1500
(Optional) Enables NAT traversal so that
ESP packets can pass through one or more
NAT devices.
If you expect multiple L2TP clients behind
a NAT device to attempt L2TP over IPsec
connections to the adaptive security
appliance, you must enable NAT traversal.
To enable NAT traversal globally, check that
ISAKMP is enabled (you can enable it with
the
crypto isakmp enable
command) in
global configuration mode, and then use the
crypto isakmp nat-traversal
command.
Step 16
strip-group
strip-realm
Example:
hostname(config)# tunnel-group DefaultRAGroup
general-attributes
hostname(config-tunnel-general)# strip-group
hostname(config-tunnel-general)# strip-realm
(Optional) Configures tunnel group
switching. The goal of tunnel group
switching is to give users a better chance at
establishing a VPN connection when they
authenticate using a proxy authentication
server. Tunnel group is synonymous with
connection profile.
Step 17
username
name
password
password
mschap
Example:
hostname
(config)# username jdoe password j!doe1 mschap
This example shows creating a user with the
username
jdoe
, the password
j!doe1.
The
mschap option specifies that the password is
converted to Unicode and hashed using
MD4 after you enter it.
This step is needed only if you are using a
local user database.
Step 18
crypto isakmp policy
priority
Example:
hostname(config)# crypto isakmp policy 5
The crypto isakmp policy command creates
the IKE Policy for Phsase 1 and assigns it a
number. There are several different
configurable parameters of the IKE policy
that you can configure.
The isakamp policy is needed so the ASA
can complete the IKE negotiation.
See the
“Creating IKE Policies to Respond
to Windows 7 Proposals” section on
page 1-12
for configuration examples for
Windows 7 native VPN clients.
Command
Purpose
Summary of Contents for 5505 - ASA Firewall Edition Bundle
Page 28: ...Glossary GL 24 Cisco ASA Series CLI Configuration Guide ...
Page 61: ...P A R T 1 Getting Started with the ASA ...
Page 62: ......
Page 219: ...P A R T 2 Configuring High Availability and Scalability ...
Page 220: ......
Page 403: ...P A R T 2 Configuring Interfaces ...
Page 404: ......
Page 499: ...P A R T 2 Configuring Basic Settings ...
Page 500: ......
Page 533: ...P A R T 2 Configuring Objects and Access Lists ...
Page 534: ......
Page 601: ...P A R T 2 Configuring IP Routing ...
Page 602: ......
Page 745: ...P A R T 2 Configuring Network Address Translation ...
Page 746: ......
Page 845: ...P A R T 2 Configuring AAA Servers and the Local Database ...
Page 846: ......
Page 981: ...P A R T 2 Configuring Access Control ...
Page 982: ......
Page 1061: ...P A R T 2 Configuring Service Policies Using the Modular Policy Framework ...
Page 1062: ......
Page 1093: ...P A R T 2 Configuring Application Inspection ...
Page 1094: ......
Page 1191: ...P A R T 2 Configuring Unified Communications ...
Page 1192: ......
Page 1333: ...P A R T 2 Configuring Connection Settings and QoS ...
Page 1334: ......
Page 1379: ...P A R T 2 Configuring Advanced Network Protection ...
Page 1380: ......
Page 1475: ...P A R T 2 Configuring Modules ...
Page 1476: ......
Page 1549: ...P A R T 2 Configuring VPN ...
Page 1550: ......
Page 1965: ...P A R T 2 Configuring Logging SNMP and Smart Call Home ...
Page 1966: ......
Page 2059: ...P A R T 2 System Administration ...
Page 2060: ......
Page 2098: ...1 8 Cisco ASA Series CLI Configuration Guide Chapter 1 Troubleshooting Viewing the Coredump ...
Page 2099: ...P A R T 2 Reference ...
Page 2100: ......