science

Internet background noise

Internet background noise is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Internet background noise rather than just read about it. In short: Internet background noise (IBN), also known as Internet background radiation (IBR, by analogy with natural background radiation), consists of data packets on the Internet addressed to IP addresses or ports where there is no network device set up to receive them. Network telescopes observe the Internet background radiation.

Key takeaways

Internet background noise belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Internet background noise to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Internet background noise from memory before moving on to harder problems.

Reference excerpt

Internet background noise (IBN), also known as Internet background radiation (IBR, by analogy with natural background radiation), consists of data packets on the Internet addressed to IP addresses or ports where there is no network device set up to receive them. Network telescopes observe the Internet background radiation. These packets often contain unsolicited commercial or network control messages, backscatters, port scans, and worm activities. Smaller devices such as DSL modems may have a hard-coded IP address to look up the correct time using the Network Time Protocol. If, for some reason, the hard-coded NTP server is no longer available, faulty software might retry failed requests up to every second, which, if many devices are affected, generates a significant amount of unnecessary request traffic.

History In the first 10 years of the Internet, there was very little background noise, but with its commercialization in the 1990s, the noise factor became a permanent feature. It was estimated in the early 2000s that the average dial-up modem user lost around 20 bits per second of their bandwidth to unsolicited traffic. During that decade, the amount of background noise for an IPv4 /8 address block (which contains 16.7 million address) increased from 1 to 50 Mbit/s (1 KB/s to 6.25 MB/s). By November 2010, it was estimated that 5.5 gigabits (687.5 megabytes) of background noise were being generated every second. In the following 15 years, this number has likely increased to a traffic rate in the order of hundreds of gigabits per second by 2025. The newer IPv6 protocol, which has a much larger address space, makes it more difficult for viruses to scan ports and also limits the impact of misconfigured equipment. The Conficker worm was responsible in 2010 for a large amount of background noise generated by viruses looking for new victims. In addition to malicious activities, misconfigured hardware and leaks from private networks are also sources of background noise. Internet background noise has been used to detect significant changes in Internet traffic and connectivity during the 2011 political unrest from IP address blocks that were geolocated to Libya.

Types Backscatter is a term coined by Vern Paxson to describe Internet background noise resulting from a DDoS attack using multiple spoofed addresses. This noise is used by network telescopes to indirectly observe large scale attacks in real time.

References

Worked examples

Example 1 — a first encounter with Internet background noise

Start with the simplest possible case. Write down what Internet background noise claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Internet background noise before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Internet background noise ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Internet background noise

In research: Internet background noise appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Internet background noise in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Internet background noise is common in secondary-school and first-year university syllabi. It links to neighbouring topics Noise (electronics), so understanding it makes those chapters shorter.
In everyday life: Look for Internet background noise outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Internet background noise in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Internet background noise means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Internet background noise out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Internet background noise in simple terms?

Why does Internet background noise matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Internet background noise?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Internet background noise.