System and method for very fast IP packet filtering
Inactive Publication Date: 2001-04-05
INT BUSINESS MASCH CORP
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- Abstract
- Description
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Benefits of technology
53. It is an advantage of the preferred embodiment of this invention that an improved, very fast IP packet filtering method and system is provided.
Problems solved by technology
9. It is an object of the invention to provide an improved IP packet filtering system and method.
Method used
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54. It will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without departing from the spirit and scope of the invention. In particular, it is within the scope of the invention to provide a memory device, such as a transmission medium, magnetic or optical tape or disc, or the like, for storing signals for controlling the operation of a computer according to the method of the invention and / or to structure its components in accordance with the system of the invention.
55. Accordingly, the scope of protection of this invention is limited only by the following claims and their equivalents.
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Small, optimized sequences of binary 6-tuples representing filter rules achieve very fast IP packet filtering. Filtering IP packets received from a caller at the physical interface to an operating system kernal is accomplished by processing FILTER rule statements entered by a user in a rules file to generate 6-tuple filtering rules, each of the 6-tuple filtering rules including an operator index; resolving relative and symbolic indexes in these 6-tuples filtering rules to form resolved filtering rules and loading the resolved filtering rules to the operating system kernal; and interpreting the resolved filtering rules for each IP packet received at the physical interface.
Description
1. U.S. patent application Ser. No. 08 / .sub.------, filed .sub.------, entitled "SYSTEM AND METHOD FOR IP NETWORK ADDRESS TRANSLATION AND IP FILTERING WITH DYNAMIC ADDRESS RESOLUTION", assignee docket number EN998067, filed concurrently herewith is assigned to the same assignee hereof and contains subject matter related, in certain respect, to the subject matter of the present application. The above-identified patent application is incorporated herein by reference.2. 1. Technical Field of the Invention3. This invention pertains to IP packet filtering. More specifically, it relates to a use of small, optimized sequences of binary 6-tuples representing filter rules to achieve very fast IP packet filtering.4. 2. Background Art5. Internet protocol (IP) network address translation (NAT) and IP filtering are functions which provide firewall-type capability to an Internet gateway system. In one specific system, this is accomplished by providing means for the system administrator to specify...
Claims
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IPC IPC(8): H04L12/56H04L29/06
CPCH04L45/00H04L45/742H04L63/0263Y10S707/99939
Inventor BODEN, EDWARD B.BRZOZOWSKI, WESLEY A.GEBLER, PAUL A. JR.
Owner INT BUSINESS MASCH CORP
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