NAME
dpa - DNS Packet Analyzer. Analyze DNS packets in ip trace files
SYNOPSIS
dpa [ OPTION ] TRACEFILE
DESCRIPTION
dpa is used to analyze dns packets in trace files. It has 3 main
options: count, filter, and count uniques (i.e. count all different
occurences).
OPTIONS
-c expressionlist
Count occurrences of matching expressions
-f expression
Filter: only process packets that match the expression
-h Show usage
-p Show the total number of correct DNS packets, and percentage of
-u and -c values (of the total of matching on the -f filter. if
no filter is given, percentages are on all correct dns packets)
-of file
Write all packets that match the -f flag to file, as pcap data.
-ofh file
Write all packets that match the -f flag to file, in hexadecimal
format, readable by drill.
-s Show possible match names
-s matchname
show possible match operators and values for name
-sf Only evaluate packets (in representation format) that match the
-f filter. If no -f was given, evaluate all correct dns pack‐
ets.
-u matchnamelist
Count every occurence of every value of the matchname (for
instance, count all packetsizes, see EXAMPLES in ldns-dpa(1) ).
-ua For every matchname in -u, show the average value of all
matches. Behaviour for match types that do not have an integer
value is undefined.
-uac For every matchname in -u, show the average number of times this
value was encountered.
-um number
Only show the results from -u for values that occurred more than
times.
-v level
Set verbosity to level (1-5, 5 being the highest). Mostly used
for debugging.
-notip file
Write packets that were not recognized as IP packets to file (as
pcap data).
-baddns file
Write dns packets that were too mangled to parse to file (as
pcap data).
-version
Show version and exit
LIST AND MATCHES
A is a comma separated list of match names (use -s to
see possible match names). A is a comma separated
list of expressions.
An expression has the following form: : ()
|
&
:
: = equal to != not equal to
> greater than < lesser than
>= greater than or equal to <= lesser than or
equal to ~= contains
See the -s option for possible matchnames, operators and values.
EXAMPLES
ldns-dpa -u packetsize -p test.tr
Count all different packetsizes in test.tr and show the precent‐
ages.
ldns-dpa -f "edns=1&qr=0" -of edns.tr test.tr
Filter out all edns enable queries in test.tr and put them in
edns.tr
ldns-dpa -f edns=1 -c tc=1 -u rcode test.tr
For all edns packets, count the number of truncated packets and
all their rcodes in test.tr.
ldns-dpa -c tc=1,qr=0,qr=1,opcode=QUERY test.tr
For all packets, count the number of truncated packets, the num‐
ber of packets with qr=0, the number of packets with qr=1 and
the number of queries in test.tr.
ldns-dpa -u packetsize -ua test.tr
Show all packet sizes and the average packet size per packet.
ldns-dpa -u srcaddress -uac test.tr
Show all packet source addresses and the average number of pack‐
ets sent from this address.
sudo tcpdump -i eth0 -s 0 -U -w - port 53 | ldns-dpa -f qr=0 -sf
Print all query packets seen on the specified interface.
AUTHOR
Written by Jelte Jansen for NLnetLabs.
REPORTING BUGS
Report bugs to .
COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
1 Nov 2005 dpa(1)