Ip Security (Ipsec) - Cisco ASR 5000 series Product Overview

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GGSN Support in GPRS/UMTS Wireless Data Services

IP Security (IPSec)

IP Security provides a mechanism for establishing secure tunnels from mobile subscribers to pre-defined endpoints (i.e.

enterprise or home networks) in accordance with the following standards:

RFC 2401, Security Architecture for the Internet Protocol

RFC 2402, IP Authentication Header (AH)

RFC 2406, IP Encapsulating Security Payload (ESP)

RFC 2409, The Internet Key Exchange (IKE)

RFC-3193, Securing L2TP using IPSEC, November 2001

IP Security (IPSec) is a suite of protocols that interact with one another to provide secure private communications across

IP networks. These protocols allow the system to establish and maintain secure tunnels with peer security gateways.

IPSec tunnel supports AAA and DHCP address overlapping. Address overlapping is meant for multiple customers using

the same IP address for AAA/DHCP servers. The AAA and DHCP control messages are sent over IPSec tunnels and

AAA/DHCP packets required to be encrypted are decided as per the ACL configuration done for specific session.

IPSec can be implemented on the system for the following applications:

PDN Access: Subscriber IP traffic is routed over an IPSec tunnel from the system to a secure gateway on the

Packet Data Network (PDN) as determined by Access Control List (ACL) criteria.

Mobile IP: Mobile IP control signals and subscriber data is encapsulated in IPSec tunnels that are established

between Foreign Agents (FAs) and Home Agents (HAs) over the Pi interfaces.

L2TP: L2TP-encapsulated packets are routed from the system to an LNS/secure gateway over an IPSec tunnel.

Once an IPSec tunnel is established between an FA and HA for a particular

subscriber, all new Mobile IP sessions using the same FA and HA are passed over the tunnel

regardless of whether or not IPSec is supported for the new subscriber sessions. Data for existing

Mobile IP sessions will be unaffected.

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Cisco ASR 5000 Series Product Overview ▄