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DDoS (distributed denial of service) - a reliable solution to ensure a hosted service (such as a website or services like PlayStation Network) remains 'invisible' for a certain period.
Engaging in discussions on DDoS
The internet, a vast interconnected network spanning a colossal space, hosts billions of tiny packets zipping around at the speed of light globally. To fathom its inner workings and the disarray within, the internet is segmented into groups, further subdivided into smaller clusters, and so forth.
This complexity adds a layer of intricacy to discussions on safeguarding against DDoS attacks. The approach for an individual computer to shield itself from DDoS is somewhat similar, albeit slightly different from the protection strategies employed by multi-million-dollar company data centers.
And let's not forget about Internet Service Providers (ISPs) in this equation. There are myriad ways to classify protection against DDoS attacks, considering the diverse components that constitute the internet with its billions of connections, clusters, continental exchanges, and sub-networks.
With all the aforementioned aspects in mind, let's adopt a surgical approach, touching upon all relevant details and crucial nuances of the issue.
The principles behind safeguarding against DDoS attacks
If you're reading this article without any knowledge of how DDoS operates, it's advisable to delve into additional online resources to avoid feeling 'out of the loop.'
There are two actions you can take with an incoming packet: ignore it or redirect it. You can't prevent the packet from being sent because you lack control over its origin. It's already here, and your software needs to determine what to do with it.
This is a truth we all adhere to, including ISPs connecting us to the internet. That's why there are many successful DDoS attacks: because you can't control the source's behavior, and the source can flood you with enough packets to overwhelm your connection.
For those delving into network research, explore the article on understanding Denial of Service (DoS) attacks here.
Software and router (Home System) workings demystified
Running a Firewall on your computer or router often traps you in a fundamental principle: if DDoS traffic is detected, the software compiles a list of IPs with suspicious activity.
It achieves this by recognizing when something sends you a stream of junk data or connection requests at an unnatural frequency, like exceeding 50 times per second. It then blocks all transactions from that source.
By blocking transactions, your computer doesn't need many resources to process internal data. The message just doesn't reach its destination. If you're blocked by your computer's Firewall and attempt to connect, you'll have to wait for a connection because anything you send will be ignored.
This is an excellent solution against Denial of Service (DoS) attacks because the attacker sees the connection wait time each time they check if their mischief is progressing. For distributed denial of service attacks, this approach can be applied as all data from attacking IP addresses will be disregarded.
Some other issues
In the world of the Internet, there's nothing called 'passive blocking.' Resources are needed even when ignoring an incoming packet. If using software, the attack stops at your computer but still goes through the router like 'a paper bullet.' It means your router is tirelessly working to route all illicit packets in your direction.
If using the Router's Firewall, everything stops there. But it still means your router is scanning the source code of each packet and then iterating through the list of blocked IP addresses to decide whether to bypass or allow that IP through.
Imagine what your router has to do every second. Your router has a limited processing power. Once it reaches that limit, it encounters issues prioritizing legitimate access, regardless of the advanced methods it employs.
Let's set all of this aside to discuss another issue. Suppose you have a 'magical' router with unlimited processing power, and your ISP still provides you with a finite bandwidth. When reaching the bandwidth limit, you'll struggle even to complete the simplest tasks on the Web.
So, the optimal solution for DDoS is to have unlimited processing power and unlimited bandwidth.
How do major companies handle their load?
DDoS mitigation by companies involves leveraging their existing infrastructure to thwart any threats that come their way. This is typically done through load balancing, content delivery networks (CDN), or a combination of both. Smaller websites and services may opt to rent from third parties if they lack the capital to maintain an array of servers.
With CDN, a website's content is replicated across a vast network of servers distributed across various geographic locations. This ensures the website loads quickly when you connect, regardless of your location in the world.
Load balancing achieves this by redistributing and segmenting data across different servers, prioritizing traffic based on the most suitable server for the task. Servers with low bandwidth but large storage can handle a large volume of small files. Servers with high bandwidth connections can handle the transmission of
How does protection against DDoS attacks work?
If an attack targets a server, load balancing can track DDoS and allow it to continue attacking that server while redirecting all legitimate traffic elsewhere on the network.
The concept here is to employ a distributed network, allocating resources at necessary locations so that the website or service can continue running while the attack focuses on a 'prey.'
Because of its distributed nature, it provides a significant advantage over a simple Firewall and protects any router it may encompass. The challenge here is needing substantial funds to kickstart operations. While they are growing, companies may rely on larger specialized providers to give them the level of protection they require.
How major companies empower internet users to self-protect
In this section, we'll explore how major companies empower internet users to self-protect from plunging into the dark abyss. This issue is quite intricate.
Internet Service Providers (ISPs) employ distinct methods to handle fluctuating access traffic. Most DDoS attacks only register on their radar because they have access to nearly unlimited bandwidth. Daily access traffic during the 7-11 PM Internet Rush Hour far surpasses the average bandwidth you receive from a DDoS stream.
Of course, since this is the Internet we're talking about, there are cases where access traffic becomes something more than just a blip on the radar.
Instances of attacks occur 'like a breeze,' attempting to overwhelm the infrastructure of smaller Internet Service Providers (ISPs). When your provider offers a solution, they employ tools to combat these threats. Here are the most common points:
- Remote Hole Black Hole: Though it sounds like something from a sci-fi movie, RTBH is a reality for Cisco. There are many ways to do this, but here's the fastest: an ISP contacts the network where the attack originates and instructs it to block all traffic heading its way. Blocking outbound traffic is simpler and easier than blocking incoming packets. Sure, everything from the target ISP will go offline for those connecting from the attack source, but it doesn't impact the rest of the world's access traffic.
- Scrubbers: Some large ISPs have data centers equipped with devices that can analyze traffic patterns to distinguish legitimate from DDoS access traffic. As it demands a considerable amount of resources and established infrastructure, smaller ISPs often hire another company to handle this. Traffic to the affected area passes through a filter, and most DDoS packets are blocked while valid access traffic is allowed. This ensures the ISP operates normally with a hefty computing cost.
- Traffic voodoo: Using a method called 'traffic shaping,' ISPs will selectively target everything that the DDoS attack brings along to the destination IP while leaving all other nodes untouched. Essentially, this 'throws' the victim under the bus to save the rest of the network. It's not the most 'friendly' solution and also the last resort ISPs will use if the network is facing a severe crisis and requires swift, decisive action to ensure the survival of the entire network.
The issue with DDoS comes hand in hand with advancements in computer technology and available bandwidth. To counter this threat, we must employ advanced network improvement methods, surpassing the capabilities of average users. Typically, households are not the primary targets of DDoS attacks.
If you want to witness these attacks unfold in real-time, you can check the Digital Attack Map.
Have you ever been a 'victim' of such attacks at home or work? The article 'How Does DDoS Protection Work?' will help you gain a deeper understanding of DDoS attacks and find solutions to cope with them.
Furthermore, you should explore hidden connections for timely detection and handling. For details, follow the guide on detecting and handling hidden connections here.
