Connection issues when ISP uses Carrier Grade NAT

[BakedPotato]

See description below.

@AndyB

Basic Info:

Platform: Steam
Issue Type: Other
Game Mode: Online Private
Server Type: PvE
Map: Exiled Lands
Server Name: [DE] Zeitalter der Krähen [RP 18+]
Mods: DungeonMasterTools.pak, xilesExtreme.pak, Emberlight.pak, Shanis-Stuff.pak, DLK-Decor.pak, RavencrestCouriers.pak, WarSong.pak, PLS_2.pak, NorthernTimber.pak, ArenaPier.pak, SandAndStone.pak, Asghaard_Desert_Town.pak, Asghaard_Ancient_Civilization.pak, matswapper.pak, SvS3.pak, SvS_Extended.pak, nordic_decorations.pak, Beyond_Decor_II.pak, SlaveWarsServer.pak, RestrictedExiles.pak, Agonys-Attic.pak, immersivearmor.pak, GrimProductions.pak, EvilsCabinet.pak, LoD_Cosmetics.pak, ModControlPanel.pak, HighHeels.pak, BarbarianBarber.pak, Attic-Hair.pak, LoD_Warpaints.pak, BT-Tattoosmithy.pak, femaleNewFaces.pak, maleNewFaces.pak, Warrior_mutator_mod.pak, Beyond_Forge.pak, Pythagoras_Support_Beams.pak, LBPR_Collision_Update_Add_On.pak, No_Building_Placement_Restrictions.pak, ExpandedMap.pak, Ancient_blades.pak, Ancient_Armor.pak, ZdK_Utilities.pak, ZdK_ServerMod.pak, KerozardsParagonLeveling.pak, Cookie_Skinnery.pak, LoD_MetalAndFlesh.pak, WonderBody.pak, Devious_Desires.pak, AmunetDecoCollector.pak, MultiChar.pak, AmunetServerTransfer.pak, ModAdmin.pak, RoleplayRedux.pak, TotImmersiveHud.pak, TotModuleAST.pak, TotAdmin.pak, TotChat.pak, TotCustom.pak

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Bug Description:

Massive connection issues. The connection itself gets established, but it is extremely slow. Only buildungs and the inventory gets loaded proberly. The decoration takes very long and character mostly doesn’t load at all. I tested this with a completely unmodded server too. Stuff loads, but slowly. If I remove bracelet the character gets a huge rubberbanding or doesn’t appear and decoration loads very slow. I just tested it on a official server (Official server #1025 PvE - g-portal.com) too and my character took >30 seconds to load after I removed the bracelet.

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Bug Reproduction:

Find a place where your ISP uses Carrier Grade NAT, so you have different IPs in your router als public IPv4 and shown to the internet (like in the server console when connecting). Then just connect to any server. The more network traffic you have the worse the problem gets. To be sure, just put Tot ! Sudo and Tot ! Custom on a freshly installed dedicated server and join. It’s pure luck if it works a bit or not.