Cable modem system
First Claim
Patent Images
1. A cable modem system comprising:
- a cable modem termination system for connecting a CATV center to a CATV transmission line, a cable modem for connecting each subscriber terminal to the CATV transmission line, and a DHCP server for dynamically allocating an IP address to the subscriber terminal by transmitting/receiving DHCP messages to/from the subscriber terminal through the cable modem, the cable modem termination system having a DHCP server address notifying portion for notifying the cable modem of a DHCP server address, and the cable modem having a DHCP relay agent for relaying the DHCP messages as a relay agent, an IP address detector for detecting the IP address from the DHCP message, an IP address storage for storing the IP address, and a packet filtering portion for discarding a packet having a source IP address other than the IP address stored in the IP address storage when the packet is received from the subscriber terminal.
1 Assignment
0 Petitions
Accused Products
Abstract
In a cable modem system utilizing a DHCP to dynamically allocate an IP address to a subscriber terminal, a DHCP server address notifying portion of a cable modem termination system notifies a cable modem of a DHCP server address, a DHCP relay agent of the cable modem relays DHCP messages as a relay agent, an IP address detector detects the IP address from the DHCP message, an IP address storage stores the IP address, and a packet filtering portion discards a packet having a source IP address other than the IP address stored in the IP address storage when the packet is received from the subscriber terminal.
62 Citations
8 Claims
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1. A cable modem system comprising:
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a cable modem termination system for connecting a CATV center to a CATV transmission line, a cable modem for connecting each subscriber terminal to the CATV transmission line, and a DHCP server for dynamically allocating an IP address to the subscriber terminal by transmitting/receiving DHCP messages to/from the subscriber terminal through the cable modem, the cable modem termination system having a DHCP server address notifying portion for notifying the cable modem of a DHCP server address, and the cable modem having a DHCP relay agent for relaying the DHCP messages as a relay agent, an IP address detector for detecting the IP address from the DHCP message, an IP address storage for storing the IP address, and a packet filtering portion for discarding a packet having a source IP address other than the IP address stored in the IP address storage when the packet is received from the subscriber terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification