SNMP OID iso.3.6.1.4.1.2021.100.4.0 , current date and time - issue

[--JayJay--]

My RT-AC66U is running Merlin version 380.64.

From this post http://www.snbforums.com/threads/snmp-monitoring.23121/
I understand generic Linux SNMP is enabled.

From the OID's listed here https://www.dd-wrt.com/wiki/index.php/SNMP#Known_OID.C2.B4s_via_SNMP
there's one command that should return the current date and time:

snmpget -v2c -c public 192.168.1.1 1.3.6.1.4.1.2021.100.4.0​

on which I receive this response...

iso.3.6.1.4.1.2021.100.4.0 = No Such Object available on this agent at this OID​

Date / time for the router is set through NTP.
The terminal command "date "shows correct date and time .

What makes the snmpget command on the router return the message
No Such Object available on this agent at this OID?

 

[RMerlin]

What MIB module is supposed to provide this? DD-WRT and me might not necessarily be enabling the same MIBs.

 

[--JayJay--]

I am just giving it a shot as searching the Internet did not provide any clue to finding the proper MIB / OID for current date and time

 

[ColinTaylor]

Try using snmpwalk and grep the thing you're looking for.

 

[--JayJay--]

I grepped "date" , "time" , "2017" using snmpwalk in both SNMP version 1 and 2c without result.
Maybe current date and time is not available through SNMP ...

 

[--JayJay--]

By doing more searching I found an OID returning the current date and time in hex
The command
snmpget -v2c -c <community> <host> 1.3.6.1.2.1.25.1.2.0
returns
07 E1 01 15 15 02 1E 00 2B 01 00

which is...
Hex > decimal
07 E1 > 2017 (year)
01 > 1 (month of year)
15 > 21 (day of month)
15 > 21 (hr)
02 > 02 (min)
1E > 30 (sec)
00 2B 01 00 > etc. (deci secs and UTC offset)

explained here...

https://www.webnms.com/snmp/help/snmpapi/snmpv3/using_mibs_in_applns/tcs_dateandtime.html

 

[--JayJay--]

What MIB module is supposed to provide this? DD-WRT and me might not necessarily be enabling the same MIBs.

The MIB is HOST-RESOURCES-MIB

snmpget -v2c -c <community> <host> HOST-RESOURCES-MIB::hrSystemDate.0
HOST-RESOURCES-MIB::hrSystemDate.0 = STRING: 2017-1-23,23:28:53.0,+1:0