Dynamic Trunking Protocol (DTP) makes it easy to sniff traffic from other VLANs. Disable DTP on user facing ports by making those ports access ports.
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Menu:
You need to learn Python! 0:00
Network Topology: 0:57
Python Script overview: 1:28
Cisco switch DTP setup: 2:00
We can see other VLAN traffic: 3:00
Script demo: 3:45
Results of attack: 4:24
Script explanation: 5:09
Create a loop: 5:49
Wireshark capturing of a different VLAN: 6:50
Kali Linux can see all VLAN traffic: 9:07
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Scripts:
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All scapy scripts here: https://davidbombal.wiki/githubscapy
Scapy DTP attack: https://davidbombal.wiki/scapydtp
Playlist: https://davidbombal.wiki/scapy
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Scapy Resources:
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Website: https://scapy.net/
Documentation: https://scapy.readthedocs.io/en/latest/
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Cisco Best practice:
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Access ports (for vlan 2 in this case):
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 2
Trunk ports:
Switch(config-if)# switchport mode trunk
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport nonegotiate
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