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The customer's initial request for addresses occurs during the ordering process . To request additional addresses , the customer should contact the AT&T Internet Services Management group , who will gather information and evaluate the request. Adequate utilization of any addresses already issued must be documented before additional addresses will be released . Additional details about IP Addressing can be found at the ARIN web site: http ://vwvw.arin . net/ Domain Name Registration AT&T offers DIA customers the option of either registering their new domain name directly with InterNIC , or having AT&T register the domain name for them . AT &T will register up to three new, single domain names as part of the DIA service for new customers during the installation process . Domain Name Service ( DNS) Primary DNS service is an optional offering to DIA customers where alphanumeric domain names are mapped to IP addresses , for ease of use for navigating web sites . Secondary DNS mirrors the information located on the primary DNS server, and acts as a backup source of addresses in the event the primary server is unreachable WebStats Web Stats is a Web based customer network reporting feature that allows customer to monitor their historical network usage statistics online. This provides an excellent opportunity for customers to visualize the usage and performance of their Internet connection . Web Stats are offered as part of the standard service for all Frame Relay, Frame Relay MLFR , Metro Ethernet, and Private Line DIA customers . Customers can access statistical information regarding their Internet connection . Network samples are taken every five to fifteen minutes by the network statistics system and rolled up each night to create daily, weekly and monthly reports . These reports are then hosted on a web site (htto7//webstats BellSouth . neVmns/) for the customer to view. Intelligent PVC (IPVC) Intelligent PVCs are Frame Relay PVCs that continuously monitor the customer network primary links . If the connectivity from the AT&T network to the BMF's primary router fails , the PVC will detect the failure. Within 6 to 60 seconds , the Intelligent PVC will detect the outage and automatically reroute service to the secondary router. Once the primary router starts working again , the Intelligent PVC will automatically reroute traffic back to the primary router. The Intelligent PVC Optional Feature does not guarantee 100% Internet availability to the customer. Intelligent PVC , optional feature, will benefit customers by: • Provides the customer with BMF router diversity for Internet access • Eliminates added expense of provisioning two local access loops • Provides more uptime without a disruption of service Network Address Translation (NAT) NAT , an optional feature for DIA Port+Access+CPE Services except Port+Access+CPE Diverse Solutions , enables a customer's private network (non- registered IP addresses ) to translate into public address space and connect to the Internet. NAT tables are defined within the Customer's Premises Router. NAT benefits customers by: • Providing some additional security by limiting internal address exposure to the global Internet (specifically, user PCs will not be reachable inbound from the Internet, only statically NATed hosts will be reachable from the Internet). • Allowing for addressing efficiencies and , • Conserving IP addresses Two NAT Models are offered : • Static Address Translation - Customer may establish a many-to-one mapping between local and global address , or Customer may configure Static address translations to the port level , using remaining IP addresses for other translations . In this scenario, only the customer's Hosts are mapped and "reachable" from the Internet; the Hosts then communicate with the customer's internal network (PCs) . • Port Address Translation (PAT) - (also known as "overload" ) Customer may map several internal addresses to one. When using PAT , traffic will attempt to engage the original source port; if the source port is fully utilized , PAT will cause the traffic to find the first available port. (same as above) Customers will be limited to the number of IP address on their LAN with NAT translation to a /24 block (254 usable addresses ) . A customer may request additional IP addresses with NAT translation . Note: The Network Address Translation feature is not supported for DIA Diversity Solutions. Cisco IDS NAT cannot be used with Hot Standby Routing Protocol (HSRP). In DIA Diversity Solutions , HSRP is used in the Customer Premises Equipment (CPE) to allow a fail-over to the secondary CPE router in the event the primary router fails . CONFIDENTIAUPROPRIETARY — NOT FOR DISCLOSURE W ITHOUT W RITTEN PERMISSION Version : 04/2007 Page 7 of 14 Created On : February 20, 2008 CCP-33130