iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
The Great Firewall of China (GFW) is the common name for the system the People’s Republic of China uses to restrict access to the global internet from within mainland China. It is not one literal wall or a single device: it is a combination of filtering and blocking practices operating across network infrastructure and internet services.
What does “Great Firewall of China” mean?
The Internet Society defines the name as “a nickname given to the system used by the People’s Republic of China to restrict access to the global Internet within the borders of Mainland China.” The term most often refers to controls on traffic crossing China’s network boundary, alongside related filtering that affects what users can reach. The Internet Society describes filtering at infrastructure level and at a limited number of cross-border links—not a single centrally located box inspecting every packet. Internet Society overview
The GFW is distinct from all other forms of online control. Network-level blocking, content moderation by platforms, platform rules and data regulation can be related, but they are not interchangeable terms. The Internet Society characterizes the controls as supported by laws establishing data-localization and transfer regimes, including cybersecurity review for some transfers; that is a high-level description, not a complete account of Chinese law.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11How does the Great Firewall work?
Documented mechanisms include interference with domain lookups, blocking destination addresses, inspecting unencrypted traffic and disrupting connections based on information visible during encrypted connections. The exact rules and deployment are not fully transparent and can change. RFC 9505 surveys censorship techniques; it is not a complete public specification of the GFW. RFC 9505
#1 Best Overall
- DUAL-BAND WIFI 6 ROUTER: Wi-Fi 6(802.11ax) technology achieves faster speeds, greater capacity and reduced network congestion compared to the previous gen. All WiFi routers require a separate modem. Dual-Band WiFi routers do not support the 6 GHz band.
- AX1800: Enjoy smoother and more stable streaming, gaming, downloading with 1.8 Gbps total bandwidth (up to 1200 Mbps on 5 GHz and up to 574 Mbps on 2.4 GHz). Performance varies by conditions, distance to devices, and obstacles such as walls.
- CONNECT MORE DEVICES: Wi-Fi 6 technology communicates more data to more devices simultaneously using revolutionary OFDMA technology
- EXTENSIVE COVERAGE: Achieve the strong, reliable WiFi coverage with Archer AX1800 as it focuses signal strength to your devices far away using Beamforming technology, 4 high-gain antennas and an advanced front-end module (FEM) chipset
- OUR CYBERSECURITY COMMITMENT: TP-Link is a signatory of the U.S. Cybersecurity and Infrastructure Security Agency’s (CISA) Secure-by-Design pledge. This device is designed, built, and maintained, with advanced security as a core requirement.
DNS interference
When a device looks up a domain, a censor can race the legitimate UDP DNS response and inject a forged answer. The incorrect address or other disruption can prevent the user from reaching the intended site. This is one documented technique, not a guarantee that every blocked domain is handled this way. USENIX study of web censorship
IP address blocking
Filtering systems can block traffic to selected IP addresses or ranges. Because multiple websites can share an address, this method may affect more than the intended hostname. Internet Society overview
HTTP inspection
Ordinary HTTP is unencrypted, so a filter can inspect fields such as the hostname, URL or content for matches. A documented response is to inject TCP reset packets when a censored host or keyword is detected. USENIX study of web censorship
Rank #2
- 𝐅𝐮𝐭𝐮𝐫𝐞-𝐑𝐞𝐚𝐝𝐲 𝐖𝐢-𝐅𝐢 𝟕 - Designed with the latest Wi-Fi 7 technology, featuring Multi-Link Operation (MLO), Multi-RUs, and 4K-QAM. Achieve optimized performance on latest WiFi 7 laptops and devices, like the iPhone 16 Pro, and Samsung Galaxy S24 Ultra.
- 𝟔-𝐒𝐭𝐫𝐞𝐚𝐦, 𝐃𝐮𝐚𝐥-𝐁𝐚𝐧𝐝 𝐖𝐢-𝐅𝐢 𝐰𝐢𝐭𝐡 𝟔.𝟓 𝐆𝐛𝐩𝐬 𝐓𝐨𝐭𝐚𝐥 𝐁𝐚𝐧𝐝𝐰𝐢𝐝𝐭𝐡 - Achieve full speeds of up to 5764 Mbps on the 5GHz band and 688 Mbps on the 2.4 GHz band with 6 streams. Enjoy seamless 4K/8K streaming, AR/VR gaming, and incredibly fast downloads/uploads.
- 𝐖𝐢𝐝𝐞 𝐂𝐨𝐯𝐞𝐫𝐚𝐠𝐞 𝐰𝐢𝐭𝐡 𝐒𝐭𝐫𝐨𝐧𝐠 𝐂𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐨𝐧 - Get up to 2,400 sq. ft. max coverage for up to 90 devices at a time. 6x high performance antennas and Beamforming technology, ensures reliable connections for remote workers, gamers, students, and more.
- 𝐔𝐥𝐭𝐫𝐚-𝐅𝐚𝐬𝐭 𝟐.𝟓 𝐆𝐛𝐩𝐬 𝐖𝐢𝐫𝐞𝐝 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 - 1x 2.5 Gbps WAN/LAN port, 1x 2.5 Gbps LAN port and 3x 1 Gbps LAN ports offer high-speed data transmissions.³ Integrate with a multi-gig modem for gigplus internet.
- 𝐎𝐮𝐫 𝐂𝐲𝐛𝐞𝐫𝐬𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐂𝐨𝐦𝐦𝐢𝐭𝐦𝐞𝐧𝐭 - TP-Link is a signatory of the U.S. Cybersecurity and Infrastructure Security Agency’s (CISA) Secure-by-Design pledge. This device is designed, built, and maintained, with advanced security as a core requirement.
HTTPS and visible hostnames
HTTPS normally encrypts the URL path and page content, but it does not necessarily hide the hostname from a network observer. Historically, the requested hostname is visible in the TLS ClientHello through Server Name Indication (SNI), which can let a filter drop connections to selected domains. RFC 9505 also notes that QUIC’s initial ClientHello protection does not effectively conceal it because the initial keys derive from a visible value. RFC 9505
Encryption therefore limits what a passive observer can read; it does not automatically make a connection unreachable by filters. The hostname, destination address and traffic patterns may still provide signals.
Classifying some encrypted traffic
A 2023 study reported a passive system that used heuristic signals to identify and block some encrypted circumvention traffic, including Shadowsocks, VMess and Obfs4. The researchers estimated that applying the studied rule broadly could potentially affect about 0.6% of normal internet traffic as collateral damage. That is an estimate for a broad-application scenario, not a measured share of all traffic actually blocked in China; the finding does not mean all encrypted traffic is blocked. USENIX Security 2023 study
Rank #3
- Dual band router upgrades to 1200 Mbps high speed internet (300mbps for 2.4GHz plus 900Mbps for 5GHz), reducing buffering and ideal for 4K stream
- Full Gigabit Ports - Gigabit Router with 4 Gigabit LAN ports, ideal for any internet plan and allow you to directly connect your wired devices
- Boosted Coverage - Four external antennas equipped with Beamforming technology extend and concentrate the Wi-Fi signals
- MU-MIMO technology - (5GHz band) allows high speeds for multiple devices simultaneously
- Access Point Mode - Supports AP Mode to transform your wired connection into wireless network, an ideal wireless router for home
Does the Great Firewall block every foreign website?
No. A site’s accessibility can depend on the exact address, connection method, network and time. A homepage may behave differently from a particular page; HTTP and HTTPS versions may also produce different results. Blocking can be partial or intermittent, so a result for one URL does not establish the status of an entire website. GreatFire’s FAQ explains why a site may open for one person despite a “blocked” result, and why HTTP and HTTPS can differ. GreatFire FAQ
Recommended Free Tools
Historical study results show why counts need dates and methods attached. In a nine-month measurement period reported at USENIX Security 2021, the GFWatch study authors tested an average of 411 million domains per day and detected 311,000 domains in the GFW’s DNS filter. They also found 41,000 innocuous domains matched the studied DNS filters, evidence of overblocking in that measured rule set. These are study findings, not current counts of all blocked sites. GFWatch study, USENIX Security 2021
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why might a site open on one network but not another?
Filtering can vary by network operator, location and measurement time. A site can also load on one protocol or path but fail on another. Thus, two users—or the same user at different times—can see different results without either observation disproving the other.
Rank #4
- Dual-band Wi-Fi with 5 GHz speeds up to 867 Mbps and 2.4 GHz speeds up to 300 Mbps, delivering 1200 Mbps of total bandwidth¹. Dual-band routers do not support 6 GHz. Performance varies by conditions, distance to devices, and obstacles such as walls.
- Covers up to 1,000 sq. ft. with four external antennas for stable wireless connections and optimal coverage.
- Supports IGMP Proxy/Snooping, Bridge and Tag VLAN to optimize IPTV streaming
- Access Point Mode - Supports AP Mode to transform your wired connection into wireless network, an ideal wireless router for home
- Advanced Security with WPA3 - The latest Wi-Fi security protocol, WPA3, brings new capabilities to improve cybersecurity in personal networks
GreatFire tests an exact URL, including its scheme, hostname and path, using several probes inside mainland China and an outside control, normally in the United States. The probes check for signals including connection resets, DNS poisoning, redirection to a mainland China server, and a failure to load when the outside control succeeds. Its headline verdict reflects conclusive tests over the preceding 90 days; inconclusive results are not proof that access is clear. GreatFire testing method
GreatFire also cautions that its probes cover only a few fixed places. A “not blocked” result means those probes reached the tested address; it does not establish that every user in mainland China can reach it. For a meaningful comparison, record the exact URL, the test date or aggregation window, the mainland probe and outside control, the observed failure signal, and whether the result was conclusive or intermittent.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
What does a blocking test actually prove?
A test supports a claim about a particular address observed from specified network vantage points during a defined time window. It does not, by itself, prove a permanent nationwide block. Prefer reports that identify the exact URL and date, explain where the probes and control were located, and distinguish a conclusive result from intermittent or inconclusive failures. GreatFire testing method
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
