System and apparatus for internet traffic inspection via localized DNS caching
US11811806B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2020 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Jun 1, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/105
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An approach is proposed to support Internet traffic inspection to detect and prevent access to blocked websites or resources. First, access requests initiated by users to websites hosted on servers over a network are intercepted by an inspection agent, which identifies and caches a pair of the domain/host name of each website and its corresponding IP address on the Internet to a localized DNS cache. When a newly intercepted access request identifies the website by its IP address only without specifying its domain/host name, the inspection agent looks up the domain name by its IP address from the DNS cache. If no domain name is found, the inspection agent redirects the access request to a proxy server instead of forwarding it to the server hosting the website for further inspection. The proxy server then inspects the IP address to determine if it is a legitimate website or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.