Technique for automated MAC address cloning
View Patent ↗In an arrangement where the device that is known to an ISP is communicating with the ISP through an interposed device that is not known to the ISP, the interposed device captures the known device's MAC address upon startup and clones the captured MAC address in all standard packets that it sends to the ISP.
1. Apparatus including a plurality of user-side connection points, each adapted to interface with a user device, and a network-side connection point adapted to interact, through an interface medium, with an Internet Service Provider (ISP), characterized by:
a first module that is not known to the ISP which, responsive to receiving a Dynamic Host Configuration Protocol (DHCP) Broadcast Discover message from one of said user-side connection points, which message includes a Media Access Control (MAC) address of a device connected to said one of said user-side connection points creates, sends to the ISP a new DHCP Broadcast Discover message that includes a captured MAC address that is other than the MAC address of the received DHCP Broadcast Discover message.
2. The apparatus of claim 1 further comprising its own MAC address and the MAC address included in the captured MAC address is other than the MAC address of the apparatus.
3. The apparatus of claim 1 where the interface medium is a modem connected to a packet network.
4. The apparatus of claim 1 where the captured MAC address is a MAC address of a DHCP Broadcast Discover Message that was previously received from one of said devices that is connected to one of said user-side connection points, which device (primary user device) is known to said ISP.
5. The apparatus of claim 1 further comprising a second module that when said received DHCP Broadcast Discover message is from one of said user devices (primary user device) that is known to the ISP, extracts the MAC address of the received DHCP Broadcast Discover message and installs the extracted MAC address in said apparatus as the captured MAC address.
6. The apparatus of claim 5 where said second module extracts said MAC address when said primary user device sends said DHCP Broadcast Discover message as it is first powered up.
7. The apparatus of claim 1 where said first module:
interacts with said ISP in accord with a protocol that is initiated by the sending of the created DHCP Discovery message to said ISP, and which protocol results in an acknowledged public IP address and a DNS address being available; and
sends a DHCP Offer message to said user device, offering a private IP address for communication between said user device and said apparatus; and
communicates with said ISP with packets that carry said extracted MAC address.
8. The apparatus of claim 7 where said first module sends the DHCP Offer message to said device following receipt of said public IP address.
9. The apparatus of claim 7 where said first modules sends the DHCP Offer message to said device prior to sending of the created DHCP Discovery message.