3 10 pts The Request for Comments RFC documents define and s

3 (10 pts) The Request for Comments (RFC) documents define and standardize the bulk of the protocols used in the Internet. They are published on behalf of the Internet Engineering Task Force IETF), which forms the main standards body of the Internet. Search the IETF site (www.ietf.org) for RFC3514, which was an April Fool\'s RFC written to identify malicious packets on the network. Once you find the document, read it and answering the following: (a) When was the RFC written? (b) How many IP header bits does the mechanism require? (c) What are its possible values? d) How does an end-system react to the settings (e) How are routers that are not security devices supposed to handle these bit(s)?

Solution

(a) It was written on April 1, 2003

(b) Only 1 bit is used to determine intent as evil or not.

(c) Possible value of evil bit is 0 or 1.

(d) If evil bit is set then end-system must drop all inbound packets. Packets with evil bit off MUST not be dropped.

(e) Routers that are not intended as security devoces should not examine this bit. This will allow them to pass packets at higher speed.