# Linux

The installation of new version of SNMP is required only for Redhat Linux versions.

Download the latest version of SNMP using the following URL:

[http://heanet.dl.sourceforge.net/sourceforge/net-snmp/](http://heanet.dl.sourceforge.net/sourceforge/net-snmp/ucd-snmp-4.2.6.tar.gz)

Extract the file using following command:

```bash
tar -zxvf ucd-snmp-4.2.6.tar.gz
```

To install SNMP, follow the steps given below:

1. Log in as root user.
2. Execute the command to set the path of the C compiler:
3. Export PATH=<gcc path>:$PATH
4. Execute the following four commands from the directory where you have extracted the ucd-snmp:

- ```bash
  ./configure --prefix=<directory_name> --with-mib-modules="host" .
  ```
  `directory_name` is the directory to install SNMP agent. Preferably choose a directory under `/root`. The directories `/usr` and `/local` might contain the files of an older version of SNMP therefore do not choose these directories to ensure proper installation.

- ```bash
  make
  ```

- ```bash
  umask 022
  ```

- ```bash
  make install
  ```

In case of rpm (redhat package manager) package installation use the following command.

```bash
rpm -i <package name>
```

## Configuring the Agent in Linux versions prior to 8

1. Stop the agent if it is already running using the command:

   ```bash
   /etc/rc.d/init.d/snmpd stop
   ```

2. Make the following changes in the `/etc/rc.d/init.d/snmpd` file:

   - Replace the line:

     ```bash
     daemon /usr/sbin/snmpd $OPTIONS
     ```

     with:

     ```bash
     daemon /root/ucd_agent/sbin/snmpd $OPTIONS
     ```

   - Replace the line:

     ```bash
     killproc /usr/sbin/snmpd
     ```

     with:

     ```bash
     killproc /root/ucd_agent/sbin/snmpd
     ```

   This is to choose the currently installed version while starting and stopping the SNMP agent.

3. Start the agent using the command:

   ```bash
   /etc/rc.d/init.d/snmpd start
   ```

## Configuring the Agent in Linux versions 8 and Above

On Linux versions 8 and above, the latest version of SNMP will already be available. You need to just make the following changes in `snmpd.conf` file:

1. Insert the line:

   ```bash
   view allview included .1.3.6
   ```

   next to the line:

   ```bash
   # name incl/excl subtree mask(optional)
   ```

2. Change the line:

   ```bash
   access notConfigGroup "" any noauth exact systemview none none
   ```

   next to the line:

   ```bash
   # group context sec.model sec.level prefix read write notif
   ```

   as:

   ```bash
   access notConfigGroup "" any noauth exact allview none none
   ```

3. Then restart the SNMP agent using the following command:

   ```bash
   /etc/rc.d/init.d/snmpd restart
   ```