Configure an Access point using SNMP - windows

Question

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.

Answer 1

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".