To resolve this issue, perform these steps: The DHCP server can run either on the CMTS itself or on another device that can be accessed by the CMTS. When configuring PAT on the cable modem, the unregistered addresses that belong to the CPE devices on the LAN interface are translated to the IP address, which is assigned to the cable interface provided by the service provider through DHCP. To identify the uniqueness of a session with the source port number, PAT enables the NAT router, allowing many hosts to share the same address simultaneously. Port Address Translation (PAT), a form of dynamic NAT, is used to bind the single valid address to the various unregistered addresses. This is done by using a valid address provided by the service provider. NAT is used on the cable modem when the CPE devices that use an unregistered address need to connect to the Internet. Cable modems can operate in bridging or routing mode. Cable modems also connect to the Cisco Customer Premises Equipment (CPE) like PCs over the LAN interface. NAT is useful for conserving IP addresses and connecting a private network using unregistered addresses to a public network like the Internet.Ĭable modems like the uBR900 series devices are used to provide Internet access to users through a cable network by connecting to a Cable Modem Termination System (CMTS) device. Network Address Translation (NAT) replaces IP addresses within a packet with different IP addresses.
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