![]() In this type of attack, an attacker changes the original frame to add two VLAN tags. Many switches make one level of 802.1Q tagging and untagging. Thwarting this type of attack is not as easy as stopping basic hopping VLAN attacks. A double tagging attack is a uni-directional attack. The Double tagging attack is only possible if the attacker has physical connectivity to an interface that belongs to the native VLAN of the trunk port. In this type of attack, the attacker takes advantage of the hardware way of operation. The double-tagging VLAN attacks are also known as double-encapsulated VLAN hopping attacks. Switch1(config-if-range)#switchport mode trunk Switch1(config)#interface range gigabitethernet 0/20 – 23 ![]() Switch1(config-if-range)#switchport nonegotiateĬonfigure all the trunk ports as a trunk port and disable DTP on trunk ports. ![]() Switch1(config-if-range)#switchport mode access Switch1(config)#interface range fastethernet 0/0 – 20 Configure all switches in the network like below. Configure all access ports as an access port and disable DTP everywhere. It is also necessary to disable DTP, and manually enable trunking.įollowing are the steps for protecting a switch from a spoofing attacks. We can avoid a switch spoofing attack by turning off trunking on all ports, except the ones that specifically require trunking. The figure below illustrates the switch spoofing/VLAN hopping attack. The attacker tricks a switch into thinking that another switch is attempting to form a trunk, thus an attacker gets access to all the VLANs allowed on the trunk port. They configure a system to spoof itself as a switch. ![]() The attacker tack advantage of the default switchport mode which is dynamic auto. VLAN hopping enables traffic from one VLAN to be seen by another VLAN. Switch spoofing is VLAN attack, taking advantage of an incorrectly configured trunk port. So in this lesson, we will discuss VLAN attacks, backhaul and how can we protect VLANs from VLAN Attacks. It also improves the performance of the network, but it has some backhaul for hackers which is necessary to understand. The VLAN simplifies network administration and maintenance. By default, trunk ports can use all VLANs and pass traffic for multiple VLANs across the same physical link between switches. Since I have done that I have not had a crash for well over 1 hour now.In the previous article, I explained how trunks work. I have also at this point disabled the OVRService service so it does not start up on its own anymore and closed the Steam application. Each time I see the same last errors posted in the event viewer. I have been watching this thing reboot about every 30 minutes. Now, this alone would not make me think it was the OVRServiceLauncher app causing the issue. Then the next event id (4625) was right after the PC started up again. It was trying to set the priority of the GPU. Looking at the application log, I see the last entry before that time was by OVRServiceLauncher at 4:06:55PM. So I know the issue had to have happened BEFORE 4:32:20PM. The next event was the first event that fired when the PC rebooted (event id 158). As seen above (checking the time stamps), The last successful SYSTEM event that was posted was event id 158 (highlighted). OVRServiceLauncher (Oculus VR Service Launcher) seems to be the culprit. Under the system log in the event viewer I have: Under the application log in the event viewer I have:
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