This is a double-edged sword. Security researchers use loggers to find "packet injection" vulnerabilities. For instance, if a client sends the price of an item in the shop window, and the server doesn't re-validate it, a hacker could modify the outgoing packet to buy a Raid Box for 1 gold. Logging is the first step to discovering such flaws.
Note: As of 2025, this is a cat-and-mouse game. Anti-cheat updates frequently break proxy captures. nostale packet logger
Hex: 0x01 0x00 0x0C 0x00 0x00 0x01 0x2A 0x00 0x00 0x00 0x00 0x00 Interpretation: - Header: 0x01 (Login response) - Length: 0x0C (12 bytes) - Result: 0x00 (Success) - Character slot count: 0x01 ... This is a double-edged sword