How to understand that the Internet provider "cuts" the speed - proposed a new method
American engineers from the center of CAIDA, engaged in data analysis, developed a system that is able to track , which of Internet providers limits the speed of Internet connection. The technology has acquired special significance in the light of the fact that the Federal Communications Commission (FCC) rules of network neutrality in the US . Today - consider this system.
/Flickr / Bruno Cordioli / CC
Why the solution CAIDAwas needed.
Since 201? the network neutrality principle was operating in the United States. He is forbade telecommunication companies make distinctions between traffic from different sources. That is, the provider had no right to limit the speed of access to any content, forcing users to purchase a premium package of services.
In June of this year, the principles of network neutrality in the United States ceased to exist. Therefore, CAIDA engineers were the system is proposed. , which will determine which of the network providers slows down or limits the speed of connection to individual resources. It is based on the concept of cross-domain traffic tracking.
How does thesystem work?
Researchers from CAIDA installed about 86 systems that track the delay in the transmission of packets in the networks of 47 Internet providers. These systems estimate the load of thousands of interdomain connections - measure latency and the percentage of lost packets. The method they use is called Time Series Latency Probes, or TSLP.
The TSLP technique involves sending test ICMP -probes (frames of type Probe Request) to servers so that the time of life of the packets (Time To Live, TTL) has expired in transit. These packets are sent to the boundary routers at the ends of the cross-domain connection, which is evaluated. By measuring the difference in the values of two TTLs, it becomes possible to calculate the delay in the channel.
Estimating the frequency of packet loss is similar. With only one difference: the delay is measured once every five minutes, and the loss of packets is checked every second.
TSLP is based on a simple idea: if the calculated load in the channel approaches the maximum (or exceeds it), then the packets fall into the buffer, which leads to an increase in the measured latency. Based on this, it is concluded that the network is overloaded, and the provider can be involved in this.
Cases when cutting speed
In the United States, there have been several cases where providers have limited the speed of Internet access for end users. Sometimes it happened at the wrong time.
One example of there may be a recent story with Verizon . The head of the fire department of Santa Clara County, California, Anthony Bowden (Anthony Bowden) says that the operator prevented them from working with their actions. Under the contract with Verizon, the fire department has 25 GB monthly. When they end, the speed of access to the network is cut 200 times. This happened at the time of putting out a serious fire, which seriously impeded the coordination of rescuers.
The fire department turned to Verizon technical support to somehow resolve the situation, but they were told that the speed of the Internet can be restored only after purchasing an extended package of services. Bowden felt that it was completely inappropriate to "cut" speed, when someone could be in danger.
/Flickr / Seth Stoll / CC
Similar situations occurred ten years ago. In 200? the operator Comcast was charged with in that it deliberately prevents BitTorrent users from exchanging files on the network. The slowdown in BitTorrent traffic was deemed illegal, but Comcast did not receive a penalty.
Researchers at CAIDA say they tested their system between March 2016 and December 2017. They noted that there is no mass tendency to limit the speed of access to the network among eight American providers (whose activities were monitored). Probably, this is due to the fact that at that time the principles of network neutrality were still in effect. However, as noted in CAIDA, some providers still slowed the speed of the Internet at certain times of the day.
The authors note that their system does not yet take into account a number of factors, in particular, the capacity of the communication line or asymmetric routing. But in the future they plan to finalize their tool and conduct a study of networks of more Internet providers. Therefore, how has the picture changed after the abolition of the neutrality of the FCC (and has it changed at all, considering that the three large US telecoms have already refused to introduce any paid subscriptions) remains to be seen.
Several articles from the VAS Experts blog:
Firewall or DPI - protection tools for different purposes
Roskomnadzor. Yesterday, today, tomorrow
IPv6 - the technology of the present or future
More on network neutrality:
The history of question
Wars with operators and the first courts
Judicial wars and public protests
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