Is the "Community" string hardcoded somewhere in SEA?
Hi
I have a machine installed with SEA 1.0.3 and developed a Subagent by myself. I want to change the Community String for security reason but encountered some problem.
I updated the community string in snmpd.conf and myagent.acl at /etc/snmp/conf. Then I stop snmpdx and start it again with "-d 4". At another terminal, I start my subagent with "-d 4" too, there is some PDU print out on the screen as follows:
SSASubagent called with mysubagent
PDU:
version: 0
community: public
type: SET_REQ_MSG (0xa3)
request id: 0
error status: noError(0)
error index: 0
name: 1.3.6.1.4.1.42.2.15.5.0
type: OCTET STRING (0x4)
length: 9
value: mysubagent ( 73 6f 67 61 6c 61 72 6d 64 )
MANAGERS:
* 0
COMMUNITIES(READ_WRITE): myprivate mypublic
#EFILTER:
TRAP RECIPIENTS:
Waiting for incoming SNMP requests on UDP port 7041
You can see from the beginning that the community print out is still "public". But at the bottom of the print out, the community has been changed.
I have 2 questions on this:
1. Since I have not any SNMP server running and I did not send any GET/SET request to my agent, I think this PDU is the registration PDU my subagent send to the master agent for register. Am I right?
2.If I update the community string in snmpdx.acl, my subagent can not start up successfully and there is some print out in the master agent site that "community_check() : bad community from myhost ". It seems that it is because the community string in the PDU is still "public" and which is different with what master agent set.
3.I'm using Solaris 5.9. Do I need some patch for this issue?
I have read the User Guide and Developer Guide of SEA but still can not resolve it , would you give some information on this?
thanks a lot
Wendy
> Is it possible in cs-mars to change the community string on multiple devices?
Yes, it's possible for some device types. The SNMP community string(s) can be bulk updated using a seed file, but only for the following device types: PIX, PIX 7.x, ASA, IOS, and SWITCH-IOS. Any other device types have to be updated manually. The details are on page 1-46 of the Device Configuration Guide. You will also need the details for using a seed file, from the same document.
> is this absoluteley necessary?
If you want to communicate with the devices via SNMP, then yes, you need to update the strings. This is especially the case if you don't use any other communications protocols such as SSH, Telnet, or FTP. Also, without the updated SNMP strings, MARS can't fully discover the Layer 2 topology from the device.
Unfortunately, the SNMP string bulk update is only available for SNMPv1 (or v2 with no encryption) credentials. If you're using SNMPv3, each device has to be edited manually.
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Cs-mars changing the community string on multiple devices
Hello,
We've changed the snmp v2 community strings on all the network devices.
Is it possible in cs-mars to change the community string on multiple devices?
When I select edit in admin>security and monitor devices> and select several devices and click edit the message "please select only one device to edit"
What's the best way to do this, and is this absoluteley nessecary?
Many thanks for all the help......> Is it possible in cs-mars to change the community string on multiple devices?
Yes, it's possible for some device types. The SNMP community string(s) can be bulk updated using a seed file, but only for the following device types: PIX, PIX 7.x, ASA, IOS, and SWITCH-IOS. Any other device types have to be updated manually. The details are on page 1-46 of the Device Configuration Guide. You will also need the details for using a seed file, from the same document.
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Disable default read community string
I would like to know the procedure to disable the default read community string which is "public" and change create a new read community string using SMC 3.0
In your topology view, right click on a host, select "Attribute Editor". Then click the "Security" tab. There are sections here to control the user and group access control as well as the SNMP community string settings for the agent. You can make changes to the community string and hit "OK".
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StorCenter px6-300d SNMP Community String
Dear Reader,
We have a NAS (StorCenter px6-300d) and we want to monitor it with our monitoring system.
On the Iomega website (http://iomega.com/resources/ui/px6-300d-313/help/help.html) i've found the configuration steps (see below) and configured our NAS.
Configuring SNMP settings
To enable SNMP, click the switch on.
Enter a unique username and password to define the community.
Confirm your password.
Enter the IP address of the host in the Trap Receivers text box. To grant access to multiple receivers, list all of them in the text box, separating each entry with a space.
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In our monitoring system we get the following msg: SNMP agent down - no response received. I think this is because of the (wrong) community string. In our monitoring system, under configuration tab, I tried 'public', 'username', 'password' etc in the community string field but it is not working.
I hope someone can help me with this... what is the community string? If i'm doing something else wrong then...
Thanks in advance.
With kind regards,
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Solved!
Go to Solution.Hi yunuz,
The username and password that you set on the NAS device needs to match on the SNMP server that you are trying to connect to. So use the same username and password for the server. Do you know what SNMP version your client is using?
What is an “SNMP Community String”?
The “SNMP Community string” is like a user id or password that allows access to a router's or other device's statistics. PRTG sends the community string along with all SNMP requests. If the community string is correct, the device responds with the requested information. If the community string is incorrect, the device simply discards the request and does not respond.
Note: SNMP Community strings are used only by devices which support SNMPv1 and SNMPv2c protocol. SNMPv3 uses username/password authentication, along with an encryption key.
By convention, most SNMPv1-v2c equipment ships from the factory with a read-only community string set to "public". It is standard practice for network managers to change all the community strings to customized values in the device setup.
Source: http://www.paessler.com/manuals/prtg_traffic_grapher/whatisansnmpcommunitystring
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