struct PACKET_ZC_NOTIFY_SKILL2 { /* this+0x0 */ short PacketType /* this+0x2 */ unsigned short SKID /* this+0x4 */ unsigned long AID /* this+0x8 */ unsigned long targetID /* this+0xc */ unsigned long startTime /* this+0x10 */ int attackMT /* this+0x14 */ int attackedMT /* this+0x18 */ int damage /* this+0x1c */ short level /* this+0x1e */ short count /* this+0x20 */ unsigned char action}
It notifies about the skill damage, and its effects to the clients.
And Maximum Buffer Reached = Server maybe queued up the request before sending or maybe too much skill spamming with many players..