![]() They hoped to crash the server, blocking people from watching the games on their devices. In 2016, for example, hackers used GRE to attack the website for the Rio Olympics. With a little bit of tinkering, they can set up distributed denial of service (DDoS) attacks that crash your servers and take you offline. The GRE protocol allows one device to talk to another, bypassing open filtering systems. GRE encapsulation attacks: definition and defense Your clean, repackaged packets could be blown apart before they're delivered. ![]() But you will add two headers, and that could mean you violate MTU rules. Move through the GRE encapsulation process, and you won't change the size of your payload. A maximum segment size (MSS) measures payload size. Sometimes, implementing a GRE tunnel means running afoul of some of these protocols.įor example, a maximum transmission unit (MTU) is set at the device level, and it dictates how big a packet can be. Packet rules are plentiful and widespread. GRE protocols in computing work much the same way (with a lot more coding, of course). You just wrap your package in another system for the journey. Doing so doesn't mean changing your package or your bike. Unfortunately, no bridge exists, and your bike can't ride across the water. You have a package tied to the back of your bicycle that you need to get to the post office across the river. Let’s give a simplistic example to describe how this works. You'll wrap your messages in the proper code and experience no delays. In essence, you'll trick your incompatible devices into believing that they can get along nicely and communicate like old friends. If you know the IP address of your target server, you could reconfigure your router and send your messages along, even if you never buy one new thing to smooth the process. Typically, solving that means buying new equipment. For example, Google Nest users dealing with low batteries or power issues may be dealing with an incompatibility issue. Many of us deal with incompatible devices. Developers can look over this very technical document and understand just how to set up new headers and configure messages to move through without disruption. GRE standards were set up by the Network Working Group back in 2000. You'll need that same data for the node you want to connect to. This isn't the same as a human-friendly web address (like An IP address is made up of numbers and decimals. But you'll need two pieces of information to get started. In most cases, you'll set up a GRE tunnel by tapping into your router setup. Even if the packet must zoom past other nodes, it's never inspected or held up along the way. Think of this as a form of direct, protected communication between two nodes. With encapsulation complete, GRE tunneling can begin.
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