![]() According to the Cisco Transparent tunneling technology, this traffic can traverse Network Address Translation (NAT) firewalls. Note The client computer must be configured as a SecureNat client.īy creating these protocol definitions, you enable the SecureNat client to connect to the Cisco VPN server through ISA Server as all traffic is passed as UDP traffic. To provide support for this configuration, create the following protocol definitions: ![]() However, Cisco Concentrator 3300, with the latest firmware updates, uses "transparent tunneling" that uses User Datagram Protocol (UDP) ports 500, 4500, and 10000 to communicate securely between VPN clients and concentrators. In most cases, IPSec VPN traffic does not pass through ISA Server 2000. This step-by-step article describes how to enable a Cisco Systems virtual private network (VPN) client computer using the IPSec protocol, on the internal network, to connect to an external Cisco VPN Concentrator using the "transparent tunneling" feature through Microsoft Internet Security and Acceleration Server 2000.īack to the top Provide Support for the Cisco VPN Client How to enable a Cisco IPSec VPN client to connect to a Cisco VPN concentrator through ISA Server 2000
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