Cisco ASR 5000 Series, Обзор продукта

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Network Address Translation Overview
NAT Feature Overview ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
In case the NAT Binding Timer < TCP 2MSL Timer, on NAT Binding Timer expiry, the TCP port is forcefully moved
to Free State (made usable) from Time Wait state and the port-chunk released.
NAT Binding Records
Whenever a NAT IP address or NAT port-chunk is allocated/deallocated to/from a subscriber, NAT Binding Records
(NBR) can be generated. Generation of NBRs is configurable in the Firewall-and-NAT policy configuration.
NBRs are supported for both on-demand and not-on-demand NAT IP pools. For a one-to-one NAT IP pool, an NBR is
generated whenever a NAT IP address is allocated/deallocated to/from a subscriber. For a many-to-one NAT IP pool, an
NBR is generated when a port-chunk is allocated/deallocated to/from a subscriber for a NAT IP address. It is also
possible to configure generation of NBRs only when a port-chunk is allocated, or deallocated, or in both cases.
The following is the list of attributes that can be present in NBRs. You can configure a subset of these attributes or all of
them to be logged in NBRs. If an attribute is not available, while logging records that field is populated with NULL.
ip subscriber-ip-address: The private IP address
radius-calling-station-id: The IMSI of the mobile node.
radius-fa-nas-identifier: A string that identifies PDSN. This field is optional if PDSN-NAS-IP address field is
present.
radius-fa-nas-ip-address:
radius-user-name: NAI of the mobile node.
sn-correlation-id: If available. The HA-Correlation-ID identifying the entire MIP session.
sn-fa-correlation-id: If available. The PDSN-Correlation-ID as sent by the PDSN using the same format and
length.
sn-nat-binding-timer: Optional. The NAT Binding Timer assigned to the Realm.
sn-nat-gmt-offset: Optional. The offset from GMT to correlate timestamps of records; GMT offset of the node
generating this record. For example: -5.00, +5.30
sn-nat-ip: The NAT IP address of mobile node.
sn-nat-last-activity-time-gmt: The time the last flow in a specific NAT set of flows was seen in GMT time.
sn-nat-port-block-end: The NAT Port Block End of the mobile node.
sn-nat-port-block-start: The NAT Port Block Start of the mobile node.
sn-nat-port-chunk-alloc-dealloc-flag: 1: allocate; 0: deallocate
sn-nat-port-chunk-alloc-time-gmt: The NAT Port Chunk Allocation Timestamp (Sample time format:
03/11/2009 10:38:35)
sn-nat-port-chunk-dealloc-time-gmt: The NAT Port Chunk Deallocation Timestamp (Sample time format:
03/11/2009 10:38:35)
sn-nat-realm-name: Optional. The name of the locally configured NAT Realm.
sn-nat-subscribers-per-ip-address: Optional. NAT Mulitplier assigned to the Realm.
bearer 3gpp charging-id: The charging ID for the PDN Session.
bearer 3gpp sgsn-address: The SGW/SGSN address.