vps is very suitable for the current highly developed Internet environment, enterprises or individual users can use vps to deploy websites, applications, game acceleration, data transfer and other services. South Korea vps geographical location, network export bandwidth is also large, for other Asian countries such as China, Japan, Southeast Asia and other regions with low access latency advantage, so it is widely used. However, some users said that there will be delays in the process of using Korean vps. The following is a specific analysis of the causes and optimization suggestions around the speed and delay problems of Korean vps network.
1. Geographical location and transnational network transmission
Although South Korea is located in East Asia, geographically close to China, Southeast Asia and other countries, network transmission still needs to pass through multiple transit nodes, and these transit paths are often affected by a variety of factors:
Physical distance is not the only factor. In theory, the closer the distance, the lower the delay, but the reality is much more complicated. The packet transmission process needs to pass through multiple ISPs (network service providers), IX (network switching centers) and router nodes, and unreasonable transmission paths or node congestion can lead to increased latency.
Submarine Cable status: Most of the Asian region relies on submarine Cable connections, South Korea mainly relies on KJCN (Korea-Japan Cable Network), APCN (Asia-Pacific Cable Network) and other lines. If fiber optic cable maintenance, breakage, or insufficient bandwidth allocation occur, it will also directly affect the cross-border communication capabilities of South Korea's VPS.
2.the local VPS room network structure and bandwidth restrictions
Limited access bandwidth for VPS service providers: In order to save costs, some small Korean VPS merchants purchase smaller international bandwidth capacity, which will lead to a decrease in overall network performance once user visits increase or abuse occurs. Most Korean VPS use virtualization technologies such as KVM or OpenVZ, and multiple users share the same host and network interface. If one user occupies too many network resources, such as large-scale downloads, uploads, and bandwidth tests, other users will be affected. The switching devices are old or improperly configured. The core switches and border routers in some equipment rooms are poorly configured, or the QoS policies are improperly configured. As a result, user requests are queued and the throughput decreases.
3. Node quality and BGP routing policy problems
BGP (Border Gateway Protocol) is a key mechanism that determines how packets "go" through the network, but its policy is not entirely based on "shortest path first". Poor BGP routing: Some Korean VPS service providers use cheaper routes (e.g., from Korea around Russia, Japan, etc., to China), which have low cost but high latency and poor path stability. The quality of the Internet with the three major operators in China is not good, if the computer room in South Korea does not establish a special line Internet or high-quality BGP Internet with China Telecom, Unicom, and China Mobile, and only transfers through a third-party network, it may encounter the speed limit, packet or delay processing on the Chinese side. Routes change frequently, and some service providers use dynamic BGP policies to automatically switch routes based on network load. Although the theory is for load balancing, frequent path changes can cause network fluctuations.
4. Impact of firewall policies and DDoS defense mechanisms
In order to prevent DDoS attacks, some VPS service providers in South Korea deploy more stringent firewall policies or traffic cleaning devices, which improve security but may also affect network performance. Automatic traffic limiting mechanism: When abnormally high traffic is detected, the system automatically enables rate limiting. As a result, all inbound and outbound traffic bandwidths are forcibly reduced.
Packet detection and deep resolution delay. Some devices perform deep detection on each packet (such as IPS, WAF), which can identify malicious behavior, but also prolong the data processing time and increase the communication delay. Traffic limiting on ports or IP addresses caused by misjudgments: If a VPS initiates a large number of requests or disconnects frequently and is identified as suspicious by the system, outgoing connections of the VPS may be temporarily restricted, affecting normal use.
5. Restrictions on the client's network status and access methods
Not all network problems originate on the server side; the user's local network environment, device configuration, and access methods are also critical.
If the broadband used locally is congested at the exit and the performance of the home router is insufficient, the connection delay may increase or the packet loss may be serious. When you connect to Korean VPS through SSH, remote desktop, or web, if compression is not enabled, encryption strength is too high, and optimization parameters are not configured, the delay will be obvious. Some users will access the Korean VPS through the Chinese mainland jumper (such as connecting to the local first), and the poor quality of the transit node will indirectly drag up the overall latency.
6. Other external factors affecting network performance
Peak access congestion: During certain hours (such as 8 p.m. to 11 p.m.), the load of local and Asian regional networks surges, which may cause international bandwidth congestion and affect user access speed.
Network attacks or abuse: If the equipment room where the VPS resides is attacked by traffic and IP segments are frequently blocked by abusers, the access rate of the entire IP segment may decrease.
VPS service provider maintenance or traffic limiting policy: Some VPS service providers limit user traffic when the traffic reaches a certain threshold, or perform batch maintenance (such as migrating hosts or restarting nics) in the background. Users may not realize this, but actual performance deteriorates.
Understanding the root causes of VPS network speed and latency issues in Korea is a prerequisite for ensuring service availability and user experience. In a word, network is a system engineering, there are many factors affecting the speed and delay of VPS, and it needs to be judged and optimized from multiple dimensions.
