There are some 'hardcoded' features that lying on src/config/core.h. To enable or disable the feature, just need to commenting or uncommenting the feature definition.
Introduced:
This feature will generate Global Unique Item for certain items, beside built-in Unique ID for equipment/non-stackable-item. When this feature is enable the item with UID will be 'separated' although the items are stackable items.
Since this feature is introduced, the NPC npc/re/other/item_merge.txt can be used to 'merge' the stackable items that separated by UID.
The items that by default were set for GUID can be found in db/[pre-]re/item_flag.txt and items that has GUID defined in item_group_db.txt (most of the are in db/re/item_package.txt
Introduced:
More info please see Packet Obfuscation Support
When this feature is enabled, you may encounter this issue below
[Info] clif_parse: Disconnecting session #4 with unknown packet version (p:0x7f57,l:19)
The solution is
Uncheck 'Disable Packet Encryption' using NEMO
//2013-08-07Ragexe
packet_ver: 45
packet_keys: 0x7E241DE0,0x5E805580,0x3D807D80 // [Shakto]
or you can put the key values on db/import/packet_db.txt like this
packet_keys_use: 0xKey1,0xKey2,0xKey3
packet_keys_use: 0x7E241DE0,0x5E805580,0x3D807D80
Make custom encryption keys using NEMO
NOTE: Recompile all servers if you made some changes here.