PDN Gateway Overview
Features and Functionality - Inline Service Support ▀
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
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Mobile video statistics
Bulk statistics for mobile video
The Cisco CAE is an optional component of the Cisco Mobile Videoscape. It runs on the Cisco UCS (Unified
Computing System) platform and functions in a UCS server cluster to bring additional video optimization capabilities to
the Mobile Videoscape. For information about the features and functions of the Cisco CAE, see the CAE product
documentation.
Important:
For more information on the Mobile Video Gateway, refer to the
Mobile Video Gateway
Administration Guide.
Network Address Translation (NAT)
NAT translates non-routable private IP address(es) to routable public IP address(es) from a pool of public IP addresses
that have been designated for NAT. This enables to conserve on the number of public IP addresses required to
communicate with external networks, and ensures security as the IP address scheme for the internal network is masked
from external hosts, and each outgoing and incoming packet goes through the translation process.
NAT works by inspecting both incoming and outgoing IP datagrams and, as needed, modifying the source IP address
and port number in the IP header to reflect the configured NAT address mapping for outgoing datagrams. The reverse
NAT translation is applied to incoming datagrams.
NAT can be used to perform address translation for simple IP and mobile IP. NAT can be selectively applied/denied to
different flows (5-tuple connections) originating from subscribers based on the flows' L3/L4 characteristics—Source-IP,
Source-Port, Destination-IP, Destination-Port, and Protocol.
NAT supports the following mappings:
One-to-One
Many-to-One
Important:
For more information on NAT, refer to the
Network Address Translation Administration Guide.
NAT64 Support
This feature helps facilitate the co-existence and gradual transition to IPv6 addressing scheme in the networks. Use of
NAT64 requires that a valid license key be installed. Contact your Cisco account representative for information on how
to obtain a license.
With the dwindling IPv4 public address space and the growing need for more routable addresses, service providers and
enterprises will continue to build and roll out IPv6 networks. However, because of the broad scale IPv4 deployment, it
is not practical that the world changes to IPv6 overnight. There is need to protect the IPv4 investment combined with the
need to expand and grow the network will force IPv4 and IPv6 networks to co-exist together for a considerable period
of time and keep end-user experience seamless.
The preferred approaches are to run dual stacks (both IPv4 and IPv6) on the end hosts, dual stack routing protocols, and
dual stack friendly applications. If all of the above is available, then the end hosts will communicate natively using IPv6
or IPv4 (using NAT). Tunneling through the IPv4 or IPv6 is the next preferred method to achieve communication
wherever possible. When all these options fail, translation is recommended.
Stateful NAT64 is a mechanism for translating IPv6 packets to IPv4 packets and vice-versa. The system supports a
Stateful NAT64 translator based on IETF Behave WG drafts whose framework is described in draft-ietf-behave-v6v4-
