![]() Note, however, that it is common for a stream of DNS messages to contain more queries than replies. In this case all the query attributes (such as type and name) are taken from the Question section of the reply. This allows you to see meaningful response code values, as well as all the other tables. If you supply (only) the -R command line option, dnstop examines replies and ignores queries. In this case the response code table is meaningless and will likely show 100% "Noerror." How Messages Are Countedīy default dnstop examines only query messages and ignores replies. After reading the entire savefile, dnstop prints the top 50 entries for each table. In this case, you must supply a savefile for reading, instead of capturing live packets. If stdout is not a tty, dnstop runs in non-interactive mode. Show sources + 1st level query names sources + 2nd level query names # While running, the following options are available to alter the display: sĭisplay the breakdown of query types seen rĭisplay the breakdown of response codes seen o savefileĪ captured network trace in pcap format deviceĮthernet device (ie fxp0) Run Time Options This can significantly reduce memory usage on busy servers and large savefiles. B bucketsĭo not tabulate the sources + query name counters. Print "progress" messages on stderr when in non-interactive mode. Only count messages within the domain name -P The "qtype-any" filter tells dnstop to count only message of type ANY. The "servfail" filter, when used with the -R option, tells dnstop to count only replies with rcode SERVFAIL. The "refused" filter, when used with the -R option, tells dnstop to count only replies with rcode REFUSED. These should never leak from inside an organization. The "rfc1918-ptr" filter includes only PTR queries for addresses in RFC1918 space. Certain Microsoft Windows DNS servers have a known bug that forward these queries. The "A-for-A" filter includes only A queries for names that are already IP addresses. Useful for identifying hosts/servers that use names which may result in future collisions and problems when new gTLDs become active. The "new-gtlds" filter includes only queries for the new gTLD program of 2013/2014. Useful for identifying hosts/servers that leak queries for things like "localhost" or "workgroup." The "unknown-tlds" filter includes only queries for TLDs that are bogus. Increasing the level provides more details, but also requires more memory and CPU. Keep counts on names up to level domain name levels.įor example, with -l 2 (the default), dnstop will keep two tables: one with top-level domain names, and another with second-level domain names. Command Line OptionsĬount only messages with IPv4 addresses -6Ĭount only messages with IPv6 addresses -Qĭo not put the interface into promiscuous mode. Test if this work, start Wireshark capture, open a command window, ping a non exist website, like ping Then stop the capture, apply the expression in the display filter, see if the unsuccessful query been listed and only that is listed.Dnstop is a small tool to listen on device or to parse the file savefile and collect and print statistics on the local network's DNS traffic. !(=0) means the reply code does not match "no error" - =1 means match all the query answer packet. RCODE Name Description Reference 0 NoError No Error 1 FormErr Format Error 2 ServFail Server Failure 3 NXDomain Non-Existent Domain 4 NotImp Not Implemented 5 Refused Query Refused 6 YXDomain Name Exists when it should not 7 YXRRSet RR Set Exists when it should not 8 NXRRSet RR Set that should exist does not 9 NotAuth Server Not Authoritative for zone 9 NotAuth Not Authorized 10 NotZone Name not contained in zone 11-15 Unassignedġ6 BADVERS Bad OPT Version 16 BADSIG TSIG Signature Failure 17 BADKEY Key not recognized 18 BADTIME Signature out of time window 19 BADMODE Bad TKEY Mode 20 BADNAME Duplicate key name 21 BADALG Algorithm not supported 22 BADTRUNC Bad Truncation 23 BADCOOKIE Bad/missing Server Cookie 24-3840 Unassignedģ841-4095 Reserved for Private Use 4096-65534 UnassignedĦ5535 Reserved, can be allocated by Standards Action ![]() Browse to Domain Name System > Flags, last line is the reply code, the 0 of which means no error.
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