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What Is Virtual Local Area Network Hopping (VLAN Hopping)?

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VLAN Hopping is the equivalent of entering a party without an invitation. Picture yourself at a house party where guests are separated into various rooms. The host has set up these VLAN-based rooms so that guests only interact with those they are meant to. But suppose you, as an uninvited visitor, figured out how to get around the VLANs and enter a restricted area. To put it simply, that's what VLAN Hopping is about. VLAN Hopping refers to an attack when a hacker or other lousy actor hops between virtual local area networks to get unauthorized access to protected data or systems. Double Tagging is one of the methods that can accomplish this. The attacker sends a packet with two VLAN tags, one for the VLAN they are intended to be in and one for the VLAN they are trying to reach. The first tag will be stripped off, and the packet will be sent to the forbidden VLAN. There is also the possibility of VLAN Hopping occurring due to a flaw in the switch's VLAN Trunking Protocol (VTP). Due to this flaw, attackers can set up their VLAN on the switch and gain access to anything on that VLAN. VLAN Hopping is a severe problem since it can compromise privacy, halt business activities, and allow an attacker to travel laterally across a network. The network administrators must avoid VLAN Hopping by ensuring that all switches are set up correctly and that all VLANs are clearly defined and secured. Also, they need to ensure that any switches they use have the most recent security fixes installed. VLAN Access Control Lists (VACLs) and Network Access Control (NAC) solutions are two alternative methods that can be used to stop VLAN Hopping. To prevent unauthorized access to a virtual local area network (VLAN), these technologies let network administrators specify which devices and users have permission to utilize the network. VLAN Hopping, in a nutshell, is the equivalent of sneaking into a party where you're not permitted to be, as it enables bad actors to avoid the virtual rooms (VLANs) set up by network administrators and gain unauthorized access to private information or resources. If you care about the safety of your network and its contents, you must take measures to prevent VLAN Hopping. Ensure the doors are locked and everyone entering and leaving the party (or your network) is accounted for.

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