Suitable Bandwidth For Playing Hearthstone On Korean Servers And Suggestions For Multiple Devices To Be Online At The Same Time

1.

overview: why choose korean servers and influencing factors

the experience of connecting to a korean server to play hearthstone is affected by many aspects.
the first factor is network latency (ping), which often affects the immediacy of operations.
the second factor is bandwidth (uplink/downlink), which affects download patch, voice and live video quality.
the third is the vps/host specifications (cpu, memory, network card), which determines the concurrent connection processing capabilities.
the fourth is cdn and domain name resolution optimization, which can reduce static resource loading time.
the fifth is ddos protection and traffic cleaning capabilities to ensure long-term stable online performance.

2.

basic data on network latency and bandwidth (for hearthstone)

hearthstone is a turn-based card game, and its real-time requirements are lower than fps, but it still needs stable latency.
ideal ping reference: local to seoul node should be ≤50ms, ≤80ms is also acceptable, >150ms will significantly affect the experience.
single device bandwidth requirements: real-time game data is usually very small, and a stable 1–3 mbps can support games and voice.
patch/update and resource download peak periods will consume tens to hundreds of mbps, so it is recommended to reserve bandwidth.
the impact of jitter and packet loss on the connection experience is greater than the peak bandwidth. jitter ≤10ms and packet loss ≤0.5% are optimal.

3.

simultaneous online bandwidth calculation and recommendation for multiple devices (including tables)

calculation principle: total bandwidth = peak demand per device × number of devices + 20% redundancy.
additional considerations for voice/live streaming: 720p live streaming is about 2.5–4 mbps; voice calls are about 64–128 kbps/person.
the example table provides common concurrent device scenarios and recommended bandwidth (including uplink requirements).
table example (the values ​​in the table are recommended values, and the units are mbps):

number of concurrent devices	average bandwidth of a single device	it is always recommended to go down	recommended to go up	remark
1	3	3	1	single machine is preferred within 50ms.
2	3	6 + 20% = 7.2	2	contains one voice
5	3	15 + 20% = 18	4	home/small internet cafe
10	3	30 + 20% = 36	6	multi-person live broadcast or teaching
20	3	60 + 20% = 72	12	small game or internet cafe

in addition, if 720p live broadcast is performed at the same time, each stream will have an additional +3 mbps uplink budget.

4.

server/vps configuration suggestions and real cases

entry vps (fits 1–5 devices): 2 vcpu, 4 gb ram, 50 gb nvme, 100 mbps shared bandwidth.
advanced vps (for 5–20 devices): 4 vcpu, 8 gb ram, 100 gb nvme, 300–500 mbps guaranteed bandwidth or 1 gbps ports.
recommended dedicated server (competition/live broadcast computer room): intel xeon e3/e5, 16–32 gb ram, 1 tb nvme, 1 gbps dedicated port, bandwidth sla ≥ 1 gbps.
real case: a domestic anchor tested at a seoul node, using a korean kvm vps (4 vcpu/8 gb/100 gb nvme/500 mbps guaranteed bandwidth). the measured stable ping was ~42 ms, the average iperf3 tcp throughput was 480 mbps, and the live broadcast was 720p without lag.
another case: a small internet cafe uses a dedicated server for local acceleration and dns caching to reduce cdn hit delays and shorten the overall login time by about 15%.

5.

cdn, domain name and ddos protection practical suggestions

cdn purpose: distribute patches, images and static resources to korean nodes to reduce long-distance bandwidth and pull delays.
it is recommended to use anycast dns with a multi-node cdn (cloudflare, akamai, tencent cloud cdn, etc.) to improve availability.
domain name resolution: set the ttl appropriately (such as 60–300s) to switch traffic to the backup node.
ddos protection strategy: use upstream cleaning (scrubbing). threshold example: common basic cleaning threshold is 100–300 gbps. for important nodes, it is recommended to use suppliers with tb-level cleaning capabilities.
boundary policy: enable rate limiting, connection tracking timeout adjustment, bgp flowspec and black hole routing (use null route with caution to avoid accidental injury).

6.

operations, monitoring and optimization steps (including test data examples)

do a baseline test before going online: use iperf3 to measure bandwidth. the goal is to achieve stable throughput of more than 90% of the bandwidth port. example: iperf3 tcp 480 mbps, udp packet loss <0.2%.
latency and jitter measurement: continuously ping the seoul node 100 times, the average ping=42 ms, and the jitter (standard deviation) is about 4.8 ms.
traffic monitoring: deploy prometheus + node_exporter + grafana to display network card throughput, number of connections, packet loss rate, and tcp retransmission rate.
traffic shaping: use tc qdisc (htb/tbf) for uplink speed limiting and priority policies to ensure that game packets are forwarded first.
daily operation and maintenance list: scheduled backup, patch window (off-peak hours), vulnerability scanning, ddos event plan and upstream communication list (isp, cleaning plant, computer room).