BNETDocs
C>S 0x07 PKT_KEEPALIVE
Message Id:0x07
Message Name:PKT_KEEPALIVE
Direction:Client to Server
Used By:Diablo Retail, Diablo Shareware
Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE
Format:

(UINT32) Tick count 

Remarks

This packet is used to keep firewalls happy and improve NAT support. It should be sent every 3-5 minutes.

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