SNMP question?

[Frank Fock]

Hi Stephen,

Are you sure that "public" is configured as write
community on the agent? Most likely not. Then the
get (with "public") works and the write view (= SET
view) is empty, because your write community is
an empty view on the objects in the agent or it simply
does not include the object you are trying to set.

Best regards,
Frank

Stephen Ciccarelli wrote:
> 
> Hi all,
> 
> I'm brand new on the list and I have what I hope is a simple question 
> regarding the snmpSet consoleExample.  Not being familiar with the 
> intrinsics of the SNMP protocol, I'm puzzled by the following behavior. 
>  Have you seen something like this before?  I successfully learned about 
> -lresolv from searching back a year or so in the archives, but I've seen 
> nothing on this in months gone by.
> 
> In the log below, the first two commands are simply the Usage for the 
> snmpGet and snmpPut command line utilities.  Then I do a Get to verify 
> the current value of a MIB variable, ActernaLab1250, at OID 
> 1.3.6.1.4.1.1751.2.18.1.1.0 followed by a Set to attempt to alter it. 
>  The return status from this first Set attempt (using SNMP v1.0) 
> indicates that the variable does not exist -- odd because I just fetched 
> it!    I then reuse snmpGet to verify the old value is still present. 
>  Sure enough.  Lastly, a final attempt to set (using SNMP v2.0) 
> indicates that there is no write access to that variable.
> 
> Clearly the variable is settable and the agent is working properly.  I 
> can set it using a copy of the SNMX script engine I'm also running. 
>  That session log is at the bottom of this mail.
> 
> The snmx++ Get logic in both cases is working -- both as a stand alone 
> command line as well as the initial fetch embedded inside the snmpSet.   
> Bizarre.  
> 
> Before tearing my hair out in frustration, I cannibalized snmpSet to 
> create snmpSet2, a version without the get (simple command-line 
> specification of char * value) thinking the reuse of the PDU might 
> somehow be corrupting it -- nope, same behavior.  Any ideas on this one?
> 
> My system is Solaris 2.8 with the native compiler.
> 
> Here's the session log:
> 
> *tourmaline% ./snmpGet*
> Usage:
> ./snmpGet IpAddress | DNSName [Oid] [options]
> Oid: sysDescr object is default
> options: -v1 , use SNMPV1, default
>          -v2 , use SNMPV2
>          -pPort , remote port to use
>          -CCommunity_name, specify community default is 'public'
>          -rN , retries default is N = 1 retry
>          -tN , timeout in hundredths of seconds; default is N = 100
> *tourmaline% ./snmpSet*
> Usage:
> ./snmpSet IpAddress | DNSName [Oid] [options]
> Oid: sysDescr object is default
> options: -v1 , use SNMPV1, default
>          -v2 , use SNMPV2
>          -pPort , remote port to use
>          -CCommunity_name, specify SET community default is 'public'
>          -GCommunity_name, specify GET community default is set 
> community value
>          -rN , retries default is N = 1 retry
>          -tN , timeout in hundredths of seconds; default is N = 100
> *tourmaline% ./snmpGet 10.10.61.62 1.3.6.1.4.1.1751.2.18.1.1.0*
> SNMP++ Get to 10.10.61.62 *SNMPV1 *Retries=1 Timeout=100ms Community=public
> Oid = 1.3.6.1.4.1.1751.2.18.1.1.0
> Value = ActernaLab1250
> *tourmaline% ./snmpSet 10.10.61.62 1.3.6.1.4.1.1751.2.18.1.1.0*
> SNMP++ Set to 10.10.61.62 *SNMPV1 *Retries=1 Timeout=100ms 
> SET-community=public GET-community=public
> Oid = 1.3.6.1.4.1.1751.2.18.1.1.0
> Current Value = ActernaLab1250
> Value Type is Octet String
> Please enter new value: Act1250
> /Set Status = SNMP: Variable does not exist/
> *tourmaline% ./snmpGet 10.10.61.62 1.3.6.1.4.1.1751.2.18.1.1.0*
> SNMP++ Get to 10.10.61.62 *SNMPV1 *Retries=1 Timeout=100ms Community=public
> Oid = 1.3.6.1.4.1.1751.2.18.1.1.0
> Value = ActernaLab1250
> *tourmaline% ./snmpSet 10.10.61.62 1.3.6.1.4.1.1751.2.18.1.1.0 -v2*
> SNMP++ Set to 10.10.61.62 *SNMPV2 *Retries=1 Timeout=100ms 
> SET-community=public GET-community=public
> Oid = 1.3.6.1.4.1.1751.2.18.1.1.0
> Current Value = ActernaLab1250
> Value Type is Octet String
> Please enter new value: Act1250
> /Set Status = SNMP: Cannot access variable, No Access/
> *tourmaline%*
> 
> 
> *SNMX script engine session:*
> 
> *PSAX> pwd*
> *Directory: /private/enterprises/lucent/mibs/acMIB/sysConfig*
> *OID: 1.3.6.1.4.1.1751.2.18.1*
> *PSAX> get siteName.0*
> *ActernaLab1250*
> *PSAX> set -snmp siteName.0 = "Act1250"*
> *PSAX> get siteName.0*
> *Act1250*
> *PSAX>*