Setup a Cisco router to SNMPv3 query a 117G running ANW2 for a oid value Cisco 891 router running Version 15.1(4)M4 117G radios running ODIA code for ANW2C.

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Presentation transcript:

Setup a Cisco router to SNMPv3 query a 117G running ANW2 for a oid value Cisco 891 router running Version 15.1(4)M4 117G radios running ODIA code for ANW2C Radios already configured for SNMPv3 operation and working with SNMPc manager (IP /24) Router interface ( /24) is connected to Radio 01 interface ( /24)

Cisco configuration (in theory all that is needed for this to work) #Enable SNMP manager service conf t snmp-server manage #Setup SNMP management all done under conf t #Set up "View1" as a view for use by users and groups and allow it to query top of the tree snmp-server view view * included #Setup the group "test" and set the security for the group to SNMPv3, point to view1 for views snmp-server group test v3 priv read view1 write view1 #Setup the user using same info SNMP manager is successfully using #user = sysadmin authpw = thisisauthstring and privpw = thisisprivstring snmp-server user sysadmin test v3 auth sha thisisauthstring priv aes 128 thisisprivstring

Cisco configuration continued #Maybe specifics to target host need to be set (didn’t resolve issue) snmp-server host version 3 priv sysadmin #Maybe EngineID cannot be default command to change EngineID to (didn’t resolve issue) snmp-server engineID remote udp-port

The problem appears to be that the Cisco is not encrypting the packet payload or including Auth/Priv information #Command to router to send query to radio using SNMPv3, use sysadmin as user and poll for the oid value snmp get v sysadmin oid Router responds with Request Failed #turning on debug snmp headers the following comes in after an attempt. The problem field Bolded and underlined Outgoing SNMP packet Mar 4 14:21:23.315: v3 packet security model: v3 security level: noauth Mar 4 14:21:23.315: username: sysadmin Mar 4 14:21:23.315: snmpEngineID: E4D3F Mar 4 14:21:23.315: snmpEngineBoots: 1 snmpEngineTime: Mar 4 14:21:23.319: Incoming SNMP packet Mar 4 14:21:23.319: v3 packet security model: v3 security level: noauth Mar 4 14:21:23.319: username: sysadmin Mar 4 14:21:23.319: snmpEngineID: E4D3F Mar 4 14:21:23.319: snmpEngineBoots: 0 snmpEngineTime: 0

Looking at the exchange using Wireshark, the router is indeed not using the Auth/Priv security level for some reason

Here is a packet capture from an exchange between the SNMP manager and the radio showing the proper encryption and auth/priv

Subsequent testing using the SNMPc manager to poll the router shows the router using SNMPv3 with auth/priv correctly (verified with debug and Wireshark). This outgoing issue seems to be either an IOS bug or some configuration that is missed that is hidden. In the router, the feature does not seem as complete as other features. The tried and true ? doesn’t work for some commands and configurations and documentation is very spotty.