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Hi all, I've been searching about this question and I've not found this question. I would like to know if it's possible to allow a maximum of 2 dualboxes and allow unlimited offline traders. Thank you very much.

Hi. Check your L2jmods.properties file.

# ---------------------------------------------------------------------------
# Dualbox Check
# ---------------------------------------------------------------------------
# Maximum number of players per IP address allowed to enter game.
# Default: 0 (unlimited)
DualboxCheckMaxPlayersPerIP = 0

# Whitelist of the addresses for dualbox checks.
# Format: Address1,Number1;Address2,Number2...
# Network address can be number (127.0.0.1) or symbolic (localhost) formats.
# Additional connection number added to the global limits for this address.
# For example, if number of TvT event participants per IP address set to the 1 (no dualbox)
# and whitelist contains "l2jserver.com,2" then number of allowed participants from l2jserver.com
# will be 1+2=3. Use 0 or negative value for unlimited number of connections.
# Default: 127.0.0.1,0 (no limits from localhost)
DualboxCheckWhitelist = 127.0.0.1,0

Maybe an addition that l2j could implement would be a whitelist not on IP-adress only, but on accounts.
For example:

Player 1 and Player 2 are brothers. They share the same IP-Adress.
However that IP-Adress is dynamic and they might even change location quite often (Maybe they live in different locations at different seasons).
They ask the Admin/GM to whitelist their specific accounts so they can log in without problem
What do you think about this idea? (To devs here on l2j).

That sounds good.