topic Re: How to use a list of whitelist mac addresses to find "bad" mac addresses? in Splunk Search

How to use a list of whitelist mac addresses to find "bad" mac addresses?

k909 — Wed, 19 Apr 2017 07:05:10 GMT

Hello,
for control dhcp server, need to search "bad" mac addresses, but use whitelist . And need modify search string for add new mac.
how use list of whitelist mac addresses to find these "bad" mac addresses?

index="cp"   DHCPREQUEST    | eval mac=substr(request_mac,1,8)  | search NOT mac="00:80:9f"  | search NOT mac="44:8a:5b" |  top limit=20 mac

Re: How to use a list of whitelist mac addresses to find "bad" mac addresses?

somesoni2 — Thu, 20 Apr 2017 05:12:33 GMT

Do you have list of bad mac addresses? You could create a lookup table file with those addresses (a csv file with single column with header as 'max' and all mac address as values of those bad mac addresses). The filter could be like this

index="cp"   DHCPREQUEST    | eval mac=substr(request_mac,1,8)  | search NOT [inputlookup your_bad_mac_lookup.csv | table mac ] |  top limit=20 mac

Re: How to use a list of whitelist mac addresses to find "bad" mac addresses?

HiroshiSatoh — Thu, 20 Apr 2017 05:20:26 GMT

I will do this.

-----whitelist.csv-----
mac
00:80:9f
44:8a:5b

index="cp"   DHCPREQUEST   NOT [|inputlookup whitelist.csv
     |fields mac|rename mac as request_mac
     |eval request_mac=request_mac+"*"]
|eval mac=substr(request_mac,1,8) 
|top limit=20 mac

Re: How to use a list of whitelist mac addresses to find "bad" mac addresses?

k909 — Thu, 20 Apr 2017 07:40:33 GMT

try to configure lookup table firstly
but result - bad, not use lookup table
where i am wrong?

cat whitelist_mac.csv

whl_mac
00:80:9f
44:8a:5b
68:f7:28
78:24:af

index="cp"   DHCPREQUEST       | eval mac=substr(request_mac,1,8)  | search NOT [inputlookup whitelist_mac | table whl_mac ] |  top limit=20 mac

mac count percent
00:80:9f 2606 44.615648
44:8a:5b 1424 24.379387
9c:1c:12 494 8.457456

Re: How to use a list of whitelist mac addresses to find "bad" mac addresses?

k909 — Thu, 20 Apr 2017 07:41:48 GMT

screenshot from dropl not work
http://d.pr/i/rn4B
http://d.pr/i/Oo6z

Re: How to use a list of whitelist mac addresses to find "bad" mac addresses?

k909 — Fri, 21 Apr 2017 06:22:44 GMT

Thank you