Wireshark is a free and open source packet analyzer used for network troubleshooting and analysis. 6 Activity 3 - Analyze DNS Response Traffic.5 Activity 2 - Analyze DNS Query Traffic.RCODE: Response code, can be NOERROR (0), FORMERR (1, Format error), SERVFAIL (2), NXDOMAIN (3, Nonexistent domain).RA: Recursion Available, in a response, indicates if the replying DNS server supports recursion.RD: Recursion Desired, indicates if the client means a recursive query.TC: Truncation, indicates that this message was truncated due to excessive length.AA: Authoritative Answer, in a response, indicates if the DNS server is authoritative for the queried hostname.QR: Indicates if the message is a query (0) or a reply (1).
ID: ID set by the client, the reply message must have the same id to distinguish which query the reply message belongs to.The query header has a fixed length of 12 bytes and contains the query/reply packet information in the following format: After receiving the query packet, DNS parses answer information, the authorized organization, the additional resource record according to the query information, and modify the relevant identification of the header and then return it to the client. The query packet only has two parts: the header and the question. | Additional (additional useful information) | | Authorization (NS record for authoritative zone servers) | | Question (record of a query to the server) | The Operating Mechanism of the Java Layer in Android Introduction to The Principle of Integer OverflowĪndroid Application Operating Mechanism Brief Manually Find the IAT and Rebuild It Using ImportRECīasic Functions in the heap implementation Software Reverse Engineering IntroductionĬommon Encryption Algorithms and Code Recognition Cryptographic Security Pseudo-random Number Generator
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