Limiting data packet forwarding to trusted ports

Details Limiting data packet forwarding to trusted ports Limiting data packet forwarding to trusted ports

2011-01-11

2011-01-11

Patel, Jayanti K (Department: 2465)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S389000, C370S401000, C709S245000

Reexamination Certificate

active

07869394

ABSTRACT:
This document describes tools that forward data packets to trusted ports and prevent data packets from egressing non-trusted ports. To do so, the tools receive a data packet having a destination address specifying that the data packet be forwarded to a set of ports associated with a domain. The tools identify a subset of the set of ports as trusted ports and forward the data packet to the subset. The tools prevent the data packet from egressing non-trusted ports of the set. In one embodiment, the tools may classify a port as trusted. To do so, the tools receive a configuration communication identifying trusted devices. The tools broadcast a request to the trusted devices and receive a reply from a reply device on a reply port. The tools determine that the reply device is one of the trusted devices and mark the reply port as a trusted port.

REFERENCES:
patent: 7231660 (2007-06-01), Daude et al.
patent: 2005/0114544 (2005-05-01), Chu et al.
patent: 2006/0212560 (2006-09-01), Purser
patent: 2006/0248229 (2006-11-01), Saunderson et al.
Droms, “RFC 2131—Dynamic Host Configuration Protocol”, Mar. 1997, pp. 1-45.
Patrick, M., “DHCP relay Agent Information Option”, Motorola BCS, Jan. 2001, 14 pages.
U.S. Appl. No. 11/533,904, filed Sep. 21, 2006, inventor Peter Nils Boden Jr., et al.

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