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Anycast vs Unicast: What It Means for Game Server Latency

Separate the route to a distributed ingress from the location and state of the game simulation behind it.

AnycastUnicastLatencyRoutingGame servers
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3 min read
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Updated
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EnderHost Team

Unicast routes an address toward a particular destination, while anycast makes the same service address reachable from multiple locations and lets routing select one. Anycast can distribute ingress or service availability, but it does not automatically place a shared game world near every player or guarantee lower end-to-end latency.

Find out where the actual game runs

Different architectures can share the same marketing term
ArchitectureQuestion to ask
Distributed stateless serviceCan each location answer the request independently?
Distributed ingress with one game backendWhat is the path and delay from ingress to the simulation?
Multiple independent game serversHow is the player assigned and what state is shared?
Failover between locationsWhat happens to active sessions and persistent data during a move?

A packet may enter a nearby edge and then travel to a distant backend. The first visible hop or a short ping to the edge does not measure the complete game path. Ask whether a measurement terminates at ingress, a proxy or the process running the world.

Long-lived sessions need a state plan

A game session can depend on state held by a particular process. If routing changes and packets reach another node, that node needs a way to handle or forward the session appropriately. Anycast itself does not supply state replication, player migration or database consistency.

Operational designs can address these requirements in different ways, but they must be described and tested. Do not assume that a network-level failover is seamless at the game level, or that replicating files makes two simulations interchangeable while players are connected.

Nearest means routing-selected, not always geographically closest

The selected ingress follows the network’s reachability and routing policy. It can differ by source ISP and change over time. That is why a test from one monitoring location cannot establish the experience for every region in a community.

How to evaluate a latency claim

  1. Identify the locations of ingress and the game backend for the proposed service.
  2. Measure application-level behavior from representative player networks, not only a public edge ping.
  3. Compare latency variation, loss and session behavior during ordinary operation.
  4. Ask for documented failover behavior and any tested limitations.
  5. Keep the same game workload and client conditions when comparing a unicast alternative.

Treat synthetic routing tests and actual gameplay results as different evidence. A short round-trip time to a proxy can be valuable, but it cannot stand in for a full interaction with the authoritative server. Likewise, a provider’s broad network footprint is not proof that your specific game service uses every location.

Does anycast equal DDoS protection?

Anycast can be part of a distributed mitigation design, but filtering, capacity, health checks and application behavior still matter. Ask what traffic is protected, where inspection occurs and which limits apply. Do not infer a particular EnderHost deployment topology from this explanatory article.

Use BGP and AS numbers for routing context and DDoS protection coverage for service questions. Compare network locations with the paths and application behavior that matter to your players.

Sources and references

Hosting documentation. Publication and update dates reflect this edition.

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