508 bytes its fully unused lib...
as a see this, some problem in LiteNet Lib ? Las we use this, we have no that problem
public override int GetMaxPacketSize(int channelId = Channels.DefaultReliable)
{
// LiteNetLib NetPeer construct calls SetMTU(0), which sets it to
// NetConstants.PossibleMtu[0] which is 576-68.
// (bigger values will cause TooBigPacketException even on loopback)
//
// see also: https://github.com/RevenantX/LiteNetLib/issues/388
return NetConstants.PossibleMtu[0];
}