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Network Strategy for MMO Game
Trần Như Toàn , Lead Software Engineer,
Game Studio North , VNG Corporation
Technical Leader
 Turn-based, Real-time MMO Games
Network Game Developers
 MMO Mobile Games
1
2
3Common Problems
Disconnection
Lag
35%
Game Client
(un-trusted , multitasking)
35%
Game Servers
(Overloaded ,Costly)
30%
Network
(latency , bandwidth)
Data Protocol
Combination
Compress
OLD
Traffic of 3200 CCU:
 In: 1,53 KB/s
 Out: 325,08 KB/s
1
2
3Common Problems
Disconnection
Lag
Slow Connection Disconnection
Maintain connection until time-out
• Use session for each connection
• Hold connection state in session
• Activate connection when having
any signal
myPlay before
Why ???
• Interrupted, even temporarily
• ISP might have intermittent
issues , router fail
• Drop in the strength of the signal
Disconnect protection Re-connection
Automatically reconnect
when connection is lost
Remain user’s state
Game flow is not interrupted
Session
Game
Client
State
Data
New
Connection
Priority Message Queue
 Game flow is not interrupted
 Client games auto-reconnect
when connection lost
 Remain state of User
The complexity of the reconnection
is hidden from the developers.
Result
1
2
3Common Problems
Disconnection
Lag
Ghost
User
Firewall
Block Game Port
Http Tunnel by-pass Firewall
Http Tunnel
Incomplete TCP disconnection occurs (e.g. disable 3g, wifi ….)
Why?How to deal with
ghosts?
Reduce the impact of pending connections
• Create scheduled task
(called Ghost Hunter)
• Check the integrity of each
connection
• Remove those that are stale
Summary
Lag
Happy Gaming
Ogdc 2013 network stragegy for mmo game

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