> ## Documentation Index
> Fetch the complete documentation index at: https://www.docusnap.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Scanning the Network over SNMP

> Capturing targets over SNMP – with a community for SNMP v1 and v2 or with a user account for SNMPv3.

There are two scan modules for SNMP. The difference lies in the protocol version
and therefore in the access data a target requires:

| Module | Access data |
| - | - |
| *SNMP v1 and v2* | an entry of the type *SNMP v1 and v2* – it carries only a *Community* |
| *SNMPv3* | an entry of the type *SNMPv3* with user name, authentication and encryption |

Both modules can be operated side by side: the older devices over *SNMP v1 and v2*,
the ones switched to v3 over *SNMPv3*. In both cases a connected
[gateway](/docs/en/scan/gateway-install) is required.

The wizard shows four steps for both; only the middle part differs from the
standard path in [Creating a Scan Job](/docs/en/scan/create-inventory).

## Entering the targets

The *Targets* step carries a table with one row per target. The columns are almost
the same for both modules:

| Column | *SNMP v1 and v2* | *SNMPv3* |
| - | - | - |
| *IP/Hostname* | yes | yes |
| *Credentials* | yes | yes |
| *Timeout (ms)* | preset with 2600 | preset with 2600 |
| *Version* | selectable, preset with 2 | fixed at 3, not visible |

Into the target column may go a single address, a range, a network in CIDR
notation (e.g. /24) or a hostname. A whole network therefore fits into one row.

<Note>
  The column is called *Credentials* with both modules, even though with
  *SNMP v1 and v2* a community stands in it and no account. The entry in the
  *Credentials for all targets* field above the table applies to all rows without
  their own assignment. With *SNMP v1 and v2* the cell per row stays a picker with free
  text – so a community can be typed straight into the row.
</Note>

<Warning>
  *Timeout (ms)* is limited silently to 100 to 60000 when you leave the field, with
  no message. Check the value once more after entering it.
</Warning>

## The access data

An entry of the type *SNMP v1 and v2* carries a single field: the *Community*.

An entry of the type *SNMPv3* carries *Username*, *Authentication Algorithm*
(*None*, *MD5* or *SHA-1*), *Authentication Password*, *Encryption Algorithm*
(*None*, *AES*, *AES-128*, *AES-192*, *AES-256*, *DES* or *TDES*),
*Encryption Password* and *Context Name*.

<Note>
  If the authentication stands at *None*, the encryption jumps back to *None*
  automatically: encryption without authentication does not exist in SNMPv3 and
  cannot be created here either.
</Note>

You can create both under *Scan › Credentials* or directly in the wizard through
the *New credentials…* row in the picker.

<Tip>
  Enter the entry above the table first and deviate from it per row only
  afterwards. The summary later shows how many targets deviate from the default –
  that way you can check whether a row was forgotten.
</Tip>

## Related

Which types these scans produce is under
[Network and Devices](/docs/en/assets/network-devices). What Docusnap365 finds in the
network but cannot assign to a type is in
[Unknown Systems](/docs/en/scan/unknown-systems).


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