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Parse DNS log

Posted on 2016-10-26
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Last Modified: 2016-10-27
Hi all,

I have a problem parse DNS log. (On Linux)
Can you help me parse DNS log with tcpdump with the format?

timestap;ip;mac;domain

Thank you very much.
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Question by:ldvhai
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Expert Comment

by:arnold
ID: 41860404
tcpdump is a packet capture.

post a line from the dns log.
and see what passing the line through to the command below returns.
awk ' { print $1,$2,$8,$10 } '
The $1,$2 should be the date/time, $8 IP, $10 domain  not sure MAC is included in a log from DNS
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by:ldvhai
ID: 41861680
Hi arnold,

These log messages: ( tcpdump -i eth0 -l -vvve dst port 53 )

13:50:03.255611 27:54:ec:89:9b:48 (oui Unknown) > 50:2d:a1:4b:d2:16 (oui Unknown), ethertype IPv4 (0x0800), length 79: (tos 0x0, ttl 128, id 3104, offset 0, flags [none], proto UDP (17), length 65)
    CHRayT530.lan.65371 > HONEYNET.lan.53: [udp sum ok] 27141+ A? clients5.google.com. (37)
13:50:03.266929 27:54:ec:89:9b:48 (oui Unknown) > 50:2d:a1:4b:d2:16 (oui Unknown), ethertype IPv4 (0x0800), length 75: (tos 0x0, ttl 128, id 3105, offset 0, flags [none], proto UDP (17), length 61)
    CHRayT530.lan.52645 > HONEYNET.lan.53: [udp sum ok] 5364+ A? plus.google.com. (33)
13:50:03.270809 27:54:ec:89:9b:48 (oui Unknown) > 50:2d:a1:4b:d2:16 (oui Unknown), ethertype IPv4 (0x0800), length 75: (tos 0x0, ttl 128, id 3106, offset 0, flags [none], proto UDP (17), length 61)
    CHRayT530.lan.63995 > HONEYNET.lan.53: [udp sum ok] 54501+ A? www.gstatic.com. (33)
13:50:04.080532 27:54:ec:89:9b:48 (oui Unknown) > 50:2d:a1:4b:d2:16 (oui Unknown), ethertype IPv4 (0x0800), length 75: (tos 0x0, ttl 128, id 3107, offset 0, flags [none], proto UDP (17), length 61)
    CHRayT530.lan.51048 > HONEYNET.lan.53: [udp sum ok] 17380+ A? apis.google.com. (33)


Format:
timestap;ip;mac;domain

Help me!

Thanks,
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Accepted Solution

by:
arnold earned 500 total points
ID: 41862621
Position $1 is the time stamp
Position $2 is the source of the packet
Position $5 is the destination of the packet

This is not a log, this is a tcpdump packet revord, you can enable DNS logging
What are you after, try using rndc on your DNS server to set its logging level and see if that is the information you are after.
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