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 Site-to-Site VPN
Cisco ISA500 Series Integrated Security Appliance Administrator Guide 250
8
For the example as illustrated in Figure 10, Site A has a LAN IP address of
10.10.10.0 and Site B has a LAN IP address of 10.20.20.0. When you
configure the Site-to-Site VPN on Site A, the local network is 10.10.10.0 and
the remote network is 10.20.20.0.
If the IP address object is not in the list, choose Create an IP Address to add
a new address object. To maintain the address objects, go to the
Networking -> Address Object Management page. See Address
Management, page 152.
NOTE The security appliance can support multiple subnets for IPSec VPN
tunnel, you may need to select a group address object including
multiple VLANs for local and remote network.
STEP 4 In the Advanced Settings tab, enter the following information:
• PFS Enable: Click On to enable Perfect Forward Secrecy (PFS) to improve
security, or click Off to disable it. If you enable PFS, a Diffie-Hellman
exchange is performed for every phase-2 negotiation. PFS is desired on the
keying channel of the VPN connection.
• DPD Enable: Click On to enable Dead Peer Detection (DPD), or click Off to
disable it. DPD is a method of detecting a dead Internet Key Exchange (IKE)
peer. The method uses IPsec traffic patterns to minimize the number of
messages required to confirm the availability of a peer. DPD is used to
reclaim the lost resources in case a peer is found dead and it is also used to
perform IKE peer failover.
If you enable DPD, enter the following information:
- Delay Time: Enter the value of delay time in seconds between DPD
sending two keepalive messages for this IPSec VPN connection. The
default is 30 seconds.
- Detection Timeout: Enter the value of detection timeout in seconds. If no
response and no traffic over the timeout, declare the peer dead. The
default is 120 seconds.
- DPD Action: Choose one of the following actions over the timeout:
Hold: Traffic from local network to remote network can trigger the
security appliance to re-initiate the IPSec VPN tunnel over the timeout.
We recommend that you use Hold when the remote peer uses a static IP
address.