Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
Network Address Translation Overview
▀ NAT Feature Overview
▄ Cisco ASR 5000 Series Product Overview
OL-22938-01
Supported NAT ALGs
This release supports NAT ALGs only for the following protocols:
File Transfer Protocol (FTP)
Point-to-Point Tunneling Protocol (PPTP): If PPTP ALG is enabled, NAT is supported for GRE flows that are
generated by PPTP.
Real Time Streaming Protocol (RTSP)
Session Initiation Protocol (SIP)
Trivial File Transfer Protocol (TFTP)
For NAT ALG processing, in the rulebase, routing rules must be configured to route packets to the corresponding
analyzers.
analyzers.
EDRs and UDRs
This section describes the NAT-specific attributes supported in EDRs and UDRs.
EDRs
The following NAT-specific attributes are supported in regular EDRs:
sn-nat-subscribers-per-ip-address: Subscriber(s) per NAT IP address
sn-subscriber-nat-flow-ip: NAT IP address of NAT-enabled subscribers
sn-subscriber-nat-flow-port: NAT port number of NAT-enabled subscribers
UDRs
The following NAT-specific attribute is supported in regular UDRs:
sn-subscriber-nat-flow-ip: NAT IP addresses that are being used by NAT-enabled subscribers. The NAT IP addresses
assigned from each of the associated pool for the call are logged. A space is used as a separator between individual IP
addresses.
assigned from each of the associated pool for the call are logged. A space is used as a separator between individual IP
addresses.
Bulk Statistics
NAT bulkstats are per context and per NAT realm. The NAT realms are configured in a context and statistics are stored
per context per realm. These statistic variables, both cumulative and snapshot, are available in the nat-realm schema.
per context per realm. These statistic variables, both cumulative and snapshot, are available in the nat-realm schema.