Configure an Access point using SNMP

Currently I am developing an C# console application using .NET 4.5 to set some configuration values of the access point. This access point is in my local network. Further I am using SnmpSharpNet library to make SNMP requests. To make the SNMP requests I used SNMP version 2.

The problem is that I can't do SET request to the access point and it always responds with "no-access" (error code 6). But I can do GET request without a problem. I checked the MIB file as well and the variable which I am going to change also has read-write access.

This is the code I wrote.

private static LogFile log;
private static SnmpV2Packet response;
private static UdpTarget target;

static void Main(string[] args)
{
    try
    {
        log = new LogFile(args[0]);
        target = new UdpTarget((IPAddress)new IpAddress("<host address>"));

        Pdu pdu = new Pdu();
        pdu.Type = PduType.Set;
        pdu.VbList.Add(new Oid("1.3.6.1.4.1.2356.11.2.88.2.0"), new Integer32(1111));

        AgentParameters aparam = new AgentParameters(SnmpVersion.Ver2, new OctetString("public"));

        response = (SnmpV2Packet)target.Request(pdu, aparam);

    }
    catch (Exception ex)
    {
        log.LogError("Request failed with the exception " + ex, "Main");
        target.Close();
        return;
    }

    if (response == null)
    {
        log.LogError("Error in SNMP request", "Main");
    }
    else
    {
        //If an incorrect response
        if (response.Pdu.ErrorStatus != 0)
        {
            log.LogError("SNMP agent returned error status " + response.Pdu.ErrorStatus, "Main");
        }
        //If a successful response
        else
        {
            log.LogInfo("Value of the " + response.Pdu[0].Oid.ToString() + "changed to " + response.Pdu[0].Value.ToString(), "Main");
        }
    }

    target.Close();
    log.CloseLogFile();
}

This is the part related to the variable in the MIB file

-- {SCALAR} 1.3.6.1.4.1.2356.11.2.88.2
lcsSetupWirelessEpaperPort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "-- empty --"
    ::= { lcsSetupWirelessEpaper 2 }

I tired same using Net-SNMP on the command line also. but the result was same.

Can someone please tell me what would be the issue and what I is the point I am missing here.

Thank you.

A "no-access" (SNMP error code 6) could also indicate that SNMP community you are using ( I'm guessing it's "public" ) does not have write access. A monitoring system, for instance, should be able to read (GET) certain values, but not write (SET) them. From a security point-of-view, it is desirable to use a SNMP community that only has read access in this case.

Check the SNMP community configuration of your AP, to make sure it has write access. I would suggest adding a new community with write access, rather than changing access for "public".