! protocol specifies the number of the virtual templates used to clone ! Enables the LNS to accept dial in requests specifies L2TP as the tunneling
#CISCO IPSEC VPN CLIENT ACCESS TO HOST WITH STATIC NAT HOW TO#
The following example shows how to enable the L2TP IPsec Support for NAT and PAT Windows Clients feature for a dynamic crypto How to Enable L2TP IPsec Support for NAT and PAT Windows Clients Maintained until one of the following actions occurs: The traffic is now sent to the appropriateĬlient, and multiple Windows clients can be connected to a Cisco IOS LNS router IPsec encrypts the packet either with the SA to Windows 2000Ĭlient #1 if the destination port is 1024 or with the SA to Windows 2000 Client Before encrypting the packet, IPsec translates theĭestination port back to the standard port number 1701, which the Windows 2000Ĭlient expects. IPsec uses the destination port number to select the SA with Reply packet, it uses the translated port number and creates a packet to thatĭestination port. Is assigned to the translated port number 1024, and Windows 2000 Client #2 isĪssigned to the translated port number 1025. With the translated port is then forwarded to L2TP.Ībove figure, with port address translation enabled, the Windows 2000 Client #1 Translated from the standard value 1701 to a client specific value. When an encrypted request is received and decrypted, the source port is The same port is used for any new SA created by thatĬlient. Traffic destined for multiple Windows 2000 clients.Īssociation (SA) is created, a translated port is assigned to the SA. This feature allows IPsec to map traffic fromĭifferent hosts to different source ports. Support for NAT and PAT Windows Clients feature is enabled, IPsec can translate The Cisco IOS LNS router since it is no longer receiving traffic. which ends Windows Client #1’s connection with The traffic that matches tunnel 192.168.200.231, port 1701 is now NAT translates outgoing connections to its outside IP address (192.168.200.232)Īgain, NAT cannot modify the L2TP port designation (1701) similar to WindowsĬlient #1. #2 establishes an IPsec-protected L2TP tunnel to the Cisco IOS LNS router and The traffic that matches the tunnel 192.168.200.231, port 1701 is sent to Which is protected by the IPsec encrypted area. However, NAT cannot modify the L2TP port designation (1701), NAT, running on the router, translates all outgoing connections (includingġ0.0.0.2) to its outside IP address (192.168.200.232), at which the address the (which it does by default) with proxies from 10.0.0.2, its local address, toġ92.168.200.231, the Cisco IOS LNS router’s address. The Windows 2000 Client #1 attempts toĮstablish an IPsec security association (SA) and requests a transport mode There is a NAT router located between them and the NAT router is enabled with The Windows 2000 Client #1 and the Cisco IOS LNS router recognize that Multiple Windows 2000 Clients, NAT Router, and Cisco IOS LNS RouterĬlient #1 establishes an IPsec-protected L2TP tunnel to the Cisco IOS LNS Through a router running NAT or PAT and IPsec-enabled Cisco IOS LNS router.įigure 1. Shows two Windows 2000 clients that are trying to connect to an end host Enabled or there is no NAT or PAT server, multiple Windows clients can connectĪnd PAT Windows Clients Feature not Enabled
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