8.11. Procedure to manage the `monx` capture interface settings

A - Introduction

This procedure describes:

Viewing the network settings
Modifying these parameters

For...

Use the command

carry out the procedures successively

obtain an overview of the information on all network interfaces

show network-config

1 - C - Preliminary operations

2 - D - Procedure to display the network configuration

display the MTU value of the interfaces

show interfaces

1 - C - Preliminary operations

2 - E - Procedure to display or change the MTU value

modify the MTU value of the interfaces

set advanced-configuration mtu

1 - C - Preliminary operations

2 - E - Procedure to display or change the MTU value

Display the available capture interfaces

show interfaces

1 - C - Preliminary operations

2 - F - Procedure to display, activate or deactivate the capture interfaces

manage the available capture interfaces

set interfaces

1 - C - Preliminary operations

2 - F - Procedure to display, activate or deactivate the capture interfaces

B - Prerequisites

User: setup
Commands used in this procedure:

C - Preliminary operations

Connect to the GCap (refer to Procedure to remote connection to GCap via an SSH tunnel)
Stop the Sigflow detection engine (refer to monitoring-engine)

D - Procedure to display the network configuration

The command prompt is displayed.

(gcap-cli)

Enter the command
```
show interfaces
```
Validate

The system displays the information of all network interfaces

Note

The `mon0`, `mon1`, `mon2` interface is enabled ( field: role, value : capture )

The `enp27s0` interface is disabled ( field: role, value : inactive)

E - Procedure to display or change the MTU value

The command prompt is displayed.

(gcap-cli)

To display the current configuration of enabled interfaces:
1. Enter the command
```
show interfaces
```
2. Validate
  
  The system displays the result
  
  The values are displayed for all enabled network interfaces (MTU field )
In our example, to change the current configuration of enabled interfaces: e.g. to change the MTU value of the `mon0` interface

The command prompt is displayed
```
(gcap-cli)
```
1. Enter the command
```
set advanced-configuration mtu mon1 2000
```
2. Validate
  
  The system displays the result
```
Updating Network MTU configuration to:
        - enp4s0: 2000
```

F - Procedure to display, activate or deactivate the capture interfaces

The command prompt is displayed.

(gcap-cli)

To display the information on the capture interfaces:
1. Enter the command
```
show interfaces
```
2. Validate
  
  The system displays the available capture interfaces
  
  The information displayed is:
  - `Label`: the label name of the interface
  - `Name`: the system name of the interface
  - `Role`: the role assigned to the interface
  - `Capture capability`: if the interface can capture traffic
  - `MTU`: the MTU of the interface
  - `Physical Address`: the MAC address of the interface
  - `Speed`: the interface speed
  - `Type`: the type of cable/sfp connected to the physical port
  - `Vendor ID`: the Vendor ID of the network card
  - `Device ID`: the ID of the network card
  - `PCI bus`: PCI bus number used by the network card
  - In our example, `mon0`, `mon1` et `mon2` are enabled ( field: role, value : capture).
To activate an interface (here enp27s0 for example):
1. Enter the command
```
set interfaces assign-role enp27s0 capture
```
2. Validate
3. then to check the new configuration
```
show interfaces
```
4. Validate
  
  The system displays the available capture interfaces
To deactivate an interface (here `mon0` for example):
1. Enter the command
```
set interfaces assign-role enp27s0 inactive
```
2. Validate
To change the interface startup delay by five seconds for example
1. Enter the command
```
set interfaces delay 5
```
2. Validate