User's Manual
Table Of Contents
- Getting Started
- Wizards
- Using the Startup Wizard
- Using the Wireless Wizard to Configure the Wireless Settings for ISA550W and ISA570W
- Using the DMZ Wizard to Configure the DMZ Settings
- Using the Dual WAN Wizard to Configure the WAN Redundancy Settings
- Using the Site-to-Site Wizard to Establish the Site-to-Site VPN Tunnels
- Using the Remote Access Wizard to Establish the IPSec VPN Tunnels or SSL VPN Tunnels for Remote Access
- Status
- Networking
- Configuring IP Routing Mode
- Port Management
- Configuring the WAN
- Configuring the WAN Redundancy
- Configuring the VLAN
- Configuring the DMZ
- Configuring the Zones
- Configuring the Routing
- Dynamic DNS
- IGMP
- VRRP
- Configuring the Quality of Service
- Address Management
- Service Management
- Wireless Configuration for ISA550W and ISA570W
- Firewall
- Configuring the Firewall Access Rules to Control Inbound and Outbound Traffic
- Configuring the Firewall Schedule
- Firewall Access Rule Configuration Examples
- Configuring the NAT Rules to Securely Access a Remote Network
- Configuring the Session Settings
- Configuring the Content Filtering to Control Access to Internet
- Configuring the MAC Filtering to Permit or Block Traffic
- Configuring the IP/MAC Binding to Prevent Spoofing
- Configuring the Attack Protection
- Configuring the Application Level Gateway
- Security Services
- VPN
- About VPN
- Configuring the Cisco IPSec VPN Server
- Configuring the Cisco IPSec VPN Client
- Configuring the Site-to-Site VPN
- Configuring the SSL VPN
- Elements of the SSL VPN
- Configuration Tasks to Establish a SSL VPN Tunnel
- Installing the Cisco AnyConnect VPN Client on User’s PC
- Importing the Certificates for User Authentication
- Configuring the SSL VPN Users
- Configuring the SSL VPN Gateway
- Configuring the SSL VPN Group Policies
- Configuring the SSL VPN Portal
- Configuring the L2TP Server
- Configuring the VPN Passthrough
- Viewing the VPN Status
- User Management
- Device Management
- Remote Management
- Administration
- SNMP
- Configuration Management
- Firmware Management
- Log Management
- Managing the Security License
- Managing the Certificates for Authentication
- Configuring the Email Alert Settings
- Configuring the RADIUS Servers
- Configuring the Time Zone
- Device Discovery
- Diagnosing the Device
- Measuring and Limiting Traffic with the Traffic Meter
- Configuring the ViewMaster
- Configuring the CCO Account
- Configuring the Device Properties
- Configuring the Debug Settings
- Troubleshooting
- Technical Specifications and Environmental Requirements
- Factory Default Settings
- Where to Go From Here
VPN
Configuring the Cisco IPSec VPN Client
Cisco ISA500 Series Integrated Security Appliance Administrator Guide 241
8
Figure 7 illustrates the client mode of operation. In this example, the security
appliance provides access to two PCs, which have IP addresses in the 10.0.0.0
private network space. These PCs connect to the Ethernet interface on the
security appliance, and the server assigns an IP address 192.168.101.2 to the
security appliance. The security appliance performs NAT or PAT translation over
the VPN tunnel so that the PCs can access the destination network. When
accessing the remote network 192.168.100.x, the hosts 10.0.0.3 and 10.0.04 will
be translated to 192.168.101.2, but hosts in the remote network 192.168.100.x can
not access the hosts 10.0.0.3 and 10.0.04.
Figure 8 Cisco IPSec VPN Client Connection
Network Extension Mode
Network Extension Mode (NEM) specifies that the PCs and other hosts at the client
end of the VPN tunnel should be given IP addresses that are fully routable and
reachable by the destination network over the tunneled network so that they form
one logical network. PAT is not used, which allows the client PCs and hosts to have
direct access to the PCs and hosts at the destination network. In NEM mode, the
Cisco VPN hardware client obtains a private IP address from a DHCP server over
the VPN tunnel.
Figure 9 illustrates the network extension mode of operation. In this example, the
security appliance acts as a Cisco VPN hardware client, connecting to a remote
Cisco IPSec VPN Server. The hosts attached to the security appliance have IP
addresses in the 10.0.0.0 private network space. The server does not assign an IP
address to the security appliance, and the security appliance does not perform
ISA500
as a Cisco IPSec VPN Client
(192.168.101.2)
10.0.0.3
10.0.0.4
Internet
Cisco Device
as a Cisco IPSec VPN Server
192.168.100.x
VPN tunnel
Inside
10.0.0.0
WAN
202.0.0.1
WAN
203.0.0.1