SNMP String Download

What is SNMP Community String ?

The SNMP String is like a user ID or password that is shipped with each SNMP Get-Request and that allows (or denies) access to the statistics of a router or other device. If the community string is correct, the device answers the requested information. If the community string is incorrect, the device rejects the request and does not respond.

Most network vendor dispatches their equipment with the default "public" password. (This is called a "default global community string.") Most network administrators change the community string to prevent intruders from getting information about network setup. That sounds good. Even if you only have read access, the intruder can learn a lot about a network that can be used to capture it.

If you have a "read-only community string", you can also expect to have one to allow you to write to the device. There is and is called the "read-write community string". There is also an SNMP Set-Request that is sent to set a specific SNMP MIB object (OID) to a specified value. The write-write string protects the device against unauthorized changes. MSNMP-language devices have filters in IP addresses (read and write) that ignore requests unless the source address is in the access list.

There is also an SNMP Trap, which is an undesirable message where the device is in an undesirable or unusual state, such as an SNMP console (such as an Intermapper). Pitfalls may indicate conditions for opening or connecting / reducing, temperatures exceeding certain thresholds, or heavy traffic. Pitfalls provide instant notification for an event that can only be discovered during polling from time to time.

What are SNMP Versions?

Intermapper can receive data from devices that use SNMP version 1, version 2c, or version 3. Each of them can access the same SNMP information, but in different ways:

SNMPv1 was the original version and provided a simple way to retrieve data. Security was provided through community strings that act as a password to allow or deny access to information. The Read-only community string allowed read requests to read data; The Read-Write community gave permission to modify the string data. All data transmissions (including community string) were sent as "open", ie unencrypted.

SNMPv2c provided additional, more efficient methods for requesting data, and added new data types (such as 64-bit counters) so that the monitoring system could receive more accurate data. SNMPv2c uses the same community string system and provides data transfer in a manner similar to SNMPv1 in SNMP String Download.

SNMPv3 provides the same data access possibilities and additional security as SNMPv2c. There is a secure method of providing authentication information (so the device knows whether to answer the query), and there is a privacy function that encrypts the entire transmission and secretly listeners cannot distinguish the data.

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Community String Types

For SNMPv1-v2c-speaking devices, there are actually three community strings:

SNMP Read-only community string - allows a remote device to receive "read-only" information from the device. SNMP Read-Write community string - to request information from a device and change settings on that device. Intermapper does not use the read-write community string because it never attempts to change settings on its devices. SNMP Trap community string - is included when a device sends SNMP Traps to the Intermapper. Intermapper accepts any SNMP Trap community string.

According to the rules, most SNMPv1-v2c equipment comes with a read-only community string set as "common" from the factory. It is standard practice for network administrators to modify all community strings; so that foreigners cannot see information about the internal network. (Also, network administrators can use firewalls to block SNMP traffic to ports 161 and 162 on the internal network in SNMP String Download.)