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SNMP

Simple Network Management Protocol
Discover devices with default public string:
msf > use auxiliary/scanner/snmp/snmp_login
msf > set PASSWORD public
msf > set RHOSTS file:snmp.txt
msf > set THREADS 25
msf > set VERBOSE false
msf > set VERSION 2c
msf > run

onesixtyone

Brute force public string:
$ onesixtyone -c /usr/share/seclists/Discovery/SNMP/snmp.txt 10.10.13.37

snmp-check

Collect data:
$ snmp-check -v 2c -c public 10.10.13.37
$ for i in `seq 1 254`; do snmp-check -v 2c -c public -t1 10.10.13.$i | grep -aA2 'System information'; done

snmpwn

$ ./snmpwn.rb --hosts hosts.txt --users users.txt --passlist passwords.txt --enclist passwords.txt