12/28/2022 0 Comments Cisco ip sec vpn client![]() NAT-T is supported on Cisco VPN clients running version 3.6 or higher.Įxample 16-31. Cisco ASA will push UDP port 10000 as the data encapsulation port to the VPN client. Example 16-31 configures Cisco ASA to use IPSec over UDP for the remote-access group DfltGrpPolicy. Additionally, Cisco ASA updates the VPN client about the UDP port it should use. During the negotiations, Cisco ASA informs the VPN client to use IPSec over UDP for data transport. In IPSec over UDP, the IKE negotiations still use UDP port 500. This is useful in scenarios where the VPN clients do not support NAT-T and are behind a firewall that does not allow ESP packets to pass through. IPSec over UDP, similar to NAT-T, is used to encapsulate the ESP packets using a UDP wrapper. Verifying VPN Client Use of IPSec over TCPĬhicago(config)# show crypto ipsec sa | include settings The "in use settings" option indicates that the particular VPN connection is a remote-access tunnel using TCP encapsulation.Įxample 16-30. To verify whether the VPN clients are using IPSec over TCP, you can use the show crypto ipsec sa | include settings command, as demonstrated in Example 16-30. IPSec over TCP ConfigurationĬhicago(config)# isakmp ipsec-over-tcp port 10000 Cisco ASA allows up to ten TCP ports to be used for this feature.Įxample 16-29. The administrator of the box prefers to use TCP port 10000 for tunnel setup and data transport. #Cisco ip sec vpn client how toExample 16-29 illustrates how to configure IPSec over TCP on Cisco ASA. ![]() When the tunnel is up, both VPN devices (Cisco ASA and the VPN client) pass traffic using the same connection. With IPSec over TCP, the security appliance negotiates the VPN tunnel using TCP as the protocol over a preconfigured port.
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