I have a question about SNMPv3. I'm doing my internship and they wanted me to get read only data and I cant figure out how to do it. I hope you guys can help me
There are 3 commands in SNMP that allow you to read data from device:
GET
GET-NEXT
GET-BULK
The Get-Bulk is supported starting from SNMPv2C.
The main difference between SNMPv3 and earlier versions of the protocol is security model. There is so called User-based Security Model (USM). So first of all you'll need to configure security principals (users) on SNMP agent/device side.
After that you'll need to download SNMP tool(s) to send your SNMP requests/commands. For example if you use NET-SNMP package you can do the following:
snmpgetnext -v 3 -n "" -u MD5User -a MD5 -A "The Net-SNMP Demo Password" -l authNoPriv test.net-snmp.org sysUpTime
You can also use graphical tools like NetDecision MIB Browser (http://netmechanica.com/products/?prod_id=1009) to query the devices via SNMPv3.
You'll have to configure SNMP User Profiles in SNMP User Manager tool just like this:
Related
I am trying to discover some Windows and Linux machines that are provided by a 3rd part vendor so I dont have Local Admin access.
Providing I have the community string can discover these devices and find information like OS, HDD utilization, machine name?
Kind Regards,
Warren Gardner
The typical SNMP discovery is simply a number of SNMP GET/GET-NEXT requests to query the list of predefined OIDs. The procedure scans the range of IP addresses (UDP port 161) using the same SNMP security parameters. For SNMP v1/v2C the only parameter you need to specify is Read Community string. For SNMPv3 you have to specify security level, auth/priv protocol, username and password and some other parameters.
Please note that there is no standard for SNMP discovery. So usually the results of discovery are very limited (subset of RFC1213 - MIB-2):
sysName,
sysDescr,
sysLocation
network interfaces
The advanced SNMP discovery procedure is usually implemented in commercial software/NMS and includes extended information from Cisco IOS, printer status (toner level and so on), etc. Also these systems are capable of doing topology discovery based on CDP, LLDP, routing tables.
My OpenNMS system is running on Windows Server 2012 and I am doing most of my configurations through the web interface.
I have configured an SNMP community associated with a range of ip addresses for the node I want to monitor. I have specified a string for this community. I have added the node (which contains multiple ip addresses) for provisioning. I have added the node to the default data collection group. However, when I try to navigate to the node, rescan it, and manage data collection per interface, I cannot view the node as an option from which to collect data. I also do not see SNMP data on the node availability graphs, only ICMP data. How should I approach this problem. Are there any additional files I need to edit?
If any of you have some knowledge of OpenNMS, I would appreciate the help. I have only been using OpenNMS for 2 weeks now, and I have very little knowledge of SNMP or networking, though I am learning more every day.
First of all, it is important to ensure your OpenNMS as SNMP access to your Device you want to monitor. You can verify this by running the following command from the CLI off your OpenNMS server:
snmpwalk -v 2c -c <your-community-string> <your-ip-interface>
If you don't see any output or a timeout, you have connectivity issues which can be firewalls between your OpenNMS and the device you want to monitor. It can also be the SNMP Agent on your Device does not allow access from your OpenNMS servers IP address.
As I'm reading your Node has multiple IP interfaces you have provisioned. You can define an attribute "SNMP Primary" which means:
P: It is the primary interface and when it is reachable, OpenNMS will try to fetch all SNMP performance data from this interface
S: It is set as secondary, it means SNMP is available but will only be used to fetch SNMP performance data if the primary interface is down
N: Not used for SNMP performance data collection
By default OpenNMS detects also services like SNMP. The SNMP service is assigned to the interface when it is possible to fetch the System Object ID (sysoid) .1.3.6.1.2.1.1.2.0 from the given IP interface using the SNMP community you have configured by the IP address in the WebUI. You can troubleshoot this on the CLI using the snmpget command from your OpenNMS server like this:
snmpget -v 2c -c <your-community-string> <your-ip-interface> .1.3.6.1.2.1.1.2.0
If you don't get a result, OpenNMS will not detect the SNMP service. OpenNMS will only try to collect SNMP performance data from an IP interface when the SNMP service is associated.
Hope this helps for further troubleshooting.
I have the following setup:
A server with CentOS 6
XMPP server (used ejabber)
A browser client (used Candy-chat)
Chat is working, users have permissions, etc.
What I need to do is to create a room when user X wants to. If the user uses a stand alone client (like Pidgin) everything is ok but I need to create a room using a browser based client.
The question is how do I do that?
Note: Tried to find a client that supports the feature - failed.
Note 2: It is ok if I can do it from server command line (shell script) since I can send an ajax request to a php script that runs the line. - I tried to use ejabberdctl for this but I couldn't find any functions that do that (found 9999 functions about users, server, etc. but nothing regarding rooms. I guess I must edit the mod_muc options then restart the server but I'm not sure and is not right for all users to restart server).
Thank you for your time.
See http://xmpp.org/extensions/xep-0045.html#createroom
XEP-0045 define the Multi-User Chat protocol in XMPP. You don't need to use the command line or any other out-of-band communication, the protocol is already defined and works in-band in the user XMPP session. This is what any Jabber client that supports chat rooms implements.
Note that the protocol itself is long, complex and has many options and alternatives (to configure the room parameters, affiliations, do administration work, etc), but you don't have to use all of them, see Example 153, just
<presence from='crone1#shakespeare.lit/desktop'to='coven#chat.shakespeare.lit/firstwitch'>
<x xmlns='http://jabber.org/protocol/muc'/>
</presence>
will be enough to create room "coven". After that user "crone1" will be the owner of that room, and will be logged in the room with nick "firstwitch".
I need to implement an SNMP manager (client) to run on a vxworks embedded single board computer, in order to monitor and control some other Linux boards, each running an SNMP agents for reading and writing local data.
Windriver supplies an example called 'snmptalk' but with no help on how to use it or how to implement it on vxworks.
option 1. Port snmptalk to vxworks
Windriver supplies snmptalk ( located at: /vxworks...\demo\snmptalk...) but only for non-vxworks implementations.
option 2.
I called Windriver support and they gave me a sample of a working SNMP get and set, and it worked great. My vxworks code can now get and set from any SNMP agent on the network.
I have now implemented an embedded web site for my client, with pages in JavaScript, which can read and write data at any SNMP data object on the network, controlled by the user web page.
i still see people using ftp or telnet for work instead of sftp and ssh. is it true that using ftp or telnet can let people see the password quite easily? Who can actually see it?
Update: for example, if i am not using Wireless... which i heard can be breakable if it is WEP when 1GB traffic is sent or received ... so if not using Wireless, and I am using either DSL, Cable Internet like Comcast, or AT&T's U-verse's fiber optics, then who can read it? Can my neighbor, or joe at the data center at a nearby company or university read it? Or joe at a big hosting company or data center that happens to be some where between California and Chicago if I am ftp'ing from California to Chicago?
Update 2: so maybe it is good to alias ftp='echo use sftp!!' on the bash too
To answer briefly, anyone on the path of the packets from your pc to the server.
In some cases (insecure networks, wireless networks, and so on) many more persons.
That's because the password will travel in plain text.
You can see more about packet sniffing at http://en.wikipedia.org/wiki/Packet_capture.
Also check http://en.wikipedia.org/wiki/File_Transfer_Protocol#Security_problems
Both ftp and telnet are unencrypted. That means that anyone who can capture your internet traffic (e.g. your isp, hosting provider, maybe government) can read your password in plain text averytime you login. Ssh and sftp/scp will encrypt your password and none should be able to read it.
Yes, by using a simple packet sniffer, such as Wireshark it is possible to read the plaintext passwords used by telnet and ftp. Try using this tool while initializing a ftp or telnet session and you'll see how non-secure these mechanisms are.
As tagged with this post, ssh and sftp are more secure alternatives as they encrypt the data as it moves across the wire. And, as always, never use these sorts of tools for evil!
Anyone with a sniffer can see it. Use the secure equivalents i.e. SFTP and SSH instead. They are protected with strong encryption and everything will be encrypted.