Presentation in OGDC 2013 organized by VNG Corp.

1. Network Strategy for MMO Game
Trần Như Toàn , Lead Software Engineer,
Game Studio North , VNG Corporation

2. Technical Leader

6.  Turn-based, Real-time MMO Games
Network Game Developers
 MMO Mobile Games

7. 1
2
3Common Problems
Disconnection
Lag

8. 35%
Game Client
(un-trusted , multitasking)
35%
Game Servers
(Overloaded ,Costly)
30%
Network
(latency , bandwidth)

10. Data Protocol
Combination
Compress

13. OLD
Traffic of 3200 CCU:
 In: 1,53 KB/s
 Out: 325,08 KB/s

14. 1
2
3Common Problems
Disconnection
Lag

15. Slow Connection Disconnection

16. Maintain connection until time-out
• Use session for each connection
• Hold connection state in session
• Activate connection when having
any signal

17. myPlay before

18. Why ???
• Interrupted, even temporarily
• ISP might have intermittent
issues , router fail
• Drop in the strength of the signal

19. Disconnect protection Re-connection

20. Automatically reconnect
when connection is lost
Remain user’s state
Game flow is not interrupted

21. Session
Game
Client
State
Data
New
Connection
Priority Message Queue

22.  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.

23. Result

24. 1
2
3Common Problems
Disconnection
Lag

25. Ghost
User
Firewall

26. Block Game Port

27. Http Tunnel by-pass Firewall
Http Tunnel

28. Incomplete TCP disconnection occurs (e.g. disable 3g, wifi ….)
Why?How to deal with
ghosts?

29. Reduce the impact of pending connections
• Create scheduled task
(called Ghost Hunter)
• Check the integrity of each
connection
• Remove those that are stale

30. Summary
Lag

31. Happy Gaming