Reflections on Host Firewalls (RFC7288)
Original Publication Date: 2014-Jun-01
Included in the Prior Art Database: 2014-Jun-25
Internet Society Requests For Comment (RFCs)
[BLOCK-FILTER] discusses the issue of blocking or filtering abusive or objectionable content and communications, and the effects on the overall Internet architecture. This document complements that discussion by focusing on the architectural effects of host firewalls on hosts and applications.
Internet Architecture Board (IAB) D. Thaler Request for Comments: 7288 Microsoft Category: Informational June 2014 ISSN: 2070-1721
Reflections on Host Firewalls
In today's Internet, the need for firewalls is generally accepted in the industry, and indeed firewalls are widely deployed in practice. Unlike traditional firewalls that protect network links, host firewalls run in end-user systems. Often the result is that software may be running and potentially consuming resources, but then communication is blocked by a host firewall. It's taken for granted that this end state is either desirable or the best that can be achieved in practice, rather than (for example) an end state where the relevant software is not running or is running in a way that would not result in unwanted communication. In this document, we explore the issues behind these assumptions and provide suggestions on improving the architecture going forward.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
This document is a product of the Internet Architecture Board (IAB) and represents information that the IAB has deemed valuable to provide for permanent record. It represents the consensus of the Internet Architecture Board (IAB). Documents approved for publication by the IAB are not a candidate for any level of Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7288.
Thaler Informational [Page 1]
RFC 7288 Host Firewalls June 2014
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Firewall Rules . . . . . . . . . . . . . . . . . . . . . . . 5
3. Category 1: Attack Surface Reduc...