# VLAN Information

## View VLAN Information

View VLAN ID:

```
 ip -d link show dev eth0 | grep 'vlan protocol'
```

## VLAN hopping

Yersinia is a framework for performing layer 2 attacks. It is designed to take advantage of some weaknesses in different network protocols. It pretends to be a solid framework for analyzing and testing the deployed networks and systems. Attacks for the following network protocols are implemented in this particular release:

* Spanning Tree Protocol (STP)
* Cisco Discovery Protocol (CDP)
* Dynamic Trunking Protocol (DTP)
* Dynamic Host Configuration Protocol (DHCP)
* Hot Standby Router Protocol (HSRP)
* 802.1q
* 802.1x
* Inter-Switch Link Protocol (ISL)
* VLAN Trunking Protocol (VTP)

Come build into Kali.

### Help menu

```
root@kali:~# yersinia -h
    ۲�۲��
   �������۲�
 ۲��������۲�
�����۱����������
����۱������������
����۱�������������               Yersinia...
������������������۲��
۲���۱��������������۲��         The Black Death for nowadays networks
 ������۱�����������������
 �������۱���������������۲�             by Slay & tomac
  ۲�����۱�������������������
     �����۱�������������������        http://www.yersinia.net
      ۲����۱���������������۲            yersinia@yersinia.net
       ۲�����۱���������������
         �������۱����������۲�
         �۲���������۱�������     Prune your MSTP, RSTP, STP trees!!!!
             �������������۲�


Usage: yersinia [-hVGIDd] [-l logfile] [-c conffile] protocol [protocol_options]
       -V   Program version.
       -h   This help screen.
       -G   Graphical mode (GTK).
       -I   Interactive mode (ncurses).
       -D   Daemon mode.
       -d   Debug.
       -l logfile   Select logfile.
       -c conffile  Select config file.
  protocol   One of the following: cdp, dhcp, dot1q, dot1x, dtp, hsrp, isl, mpls, stp, vtp.

Try 'yersinia protocol -h' to see protocol_options help

Please, see the man page for a full list of options and many examples.
Send your bugs & suggestions to the Yersinia developers <yersinia@yersinia.net>



MOTD: The Hakin9 magazine owe money to us... 500 Euros 
```

### Graphical interface:

yersinia -G

### To Abuse DTP:

```
click "Launch attack" 
click the tab "DTP" 
click "enable trunking" 
click "ok" 
```

And now add the new route you want to attack:

```
modprobe 8021q
vconfig add eth {VLAN Number}
ifconfig eth0.200 up
Ifconfig eth.200 {ip range} up
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://infra.newerasec.com/infrastructure-testing/gaining-access/vlan-hopping.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.