Lineage II Server Security: A Practical Baseline
Most exploited servers were not targeted by geniuses - they simply left the front door open. This is the baseline every Lineage II server should have.
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Security work on a Lineage II server is unglamorous and continuous. The goal is not a perfect fortress; it is to raise the cost of attacks above what your server is worth to an attacker, and to detect the ones that get through quickly.
Validate everything the client sends
The client is hostile input. Movement, item actions, trades, enchant requests and skill use all need server-side validation against the actual game state - never trust coordinates, quantities or target IDs at face value.
Rate-limit and sanity-check
- Cap actions per second per connection for high-risk packets.
- Detect impossible sequences: acting while dead, trading with yourself, enchanting items not in inventory.
- Alert on statistical outliers in adena flow, drops and kills per hour.
Design the economy to resist dupes
Most "hack" reports on private servers are duplication bugs, not aimbots. Transaction boundaries, atomic inventory operations and reconciliation jobs matter more than any external anti-cheat.
Harden the admin surface
GM accounts are the highest-value target. Separate GM credentials from player accounts, log every admin command with the actor and target, and keep the admin panel off the public internet or behind strong authentication.
L2Developers builds guard systems, anti-bot heuristics and exploit fixes tailored to your pack - and audits existing servers. See the Security service page.
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