Important: NAT is supported only for TCP, UDP, and ICMP flows. For other flows NAT is bypassed. For GRE flows, NAT is supported only if the PPTP ALG is configured. For more information on ALGs, please refer to the
NAT Application Level Gateway section.
Important: To get NATed, the private IP addresses assigned to subscribers must be from the following ranges: Class A 10.0.0.0 – 10.255.255.255, Class B 172.16.0.0 – 172.31.255.255, and Class C 192.168.0.0 – 192.168.255.255
Important: The minimum number of public IP addresses that must be allocated to each NAT IP pool must be greater than or equal to the number of Session Managers (SessMgrs) available on the system. On the ASR 5000, it is >= 84 public IP addresses. This can be met by a range of 84 host addresses from a single Class C. The remaining space from the Class C can be used for other allocations. Each address has available its port range ~64K ports.
Important: In StarOS 8.x, NAT for CDMA and early UMTS releases used rulebase-based configurations, whereas in later UMTS releases NAT used policy-based configurations. In StarOS 9.0 and later releases, NAT for UMTS and CDMA releases both use policy-based configurations. For more information, please contact your local service representative.
Important: In a Firewall-and-NAT policy, a maximum of three NAT IP pools/NAT IP pool groups can be configured. A subscriber can be allocated only one NAT IP address per NAT IP pool/NAT IP pool group, hence at anytime, there can only be a maximum of three NAT IP addresses allocated to a subscriber.
Important: The Firewall-and-NAT policy received from the AAA and OCS have the same priority. Whichever comes latest, either from AAA/OCS, is applied.
Important: When the firewall AVP contains “disable” during mid-session firewall policy change, there will be no action taken as the Firewall-and-NAT policy cannot be disabled dynamically. The policy currently applied will continue.
Important: A subscriber can be allocated only one NAT IP address per NAT IP pool/NAT IP pool group from a maximum of three NAT IP pools/NAT IP pool groups. Hence, at anytime, there can only be a maximum of three NAT IP addresses allocated to a subscriber.
Important: The private IP addresses assigned to subscribers must be from the following ranges for them to get translated: Class A 10.0.0.0 – 10.255.255.255, Class B 172.16.0.0 – 172.31.255.255, and Class C 192.168.0.0 – 192.168.255.255
Important: A subscriber can be allocated only one NAT IP address per NAT IP pool/NAT IP pool group from a maximum of three pools/pool groups. Hence, at any point, there can be a maximum of three NAT IP addresses allocated to a subscriber.