MAX_VOXEL_PACKET_SIZE should connect back (or be a function of) to some sort of single system global that is well-marked and represents the largest number of bytes that we want UDP packets to be.   I just looked through the code and can't find the variable - I know we've got something in there already somewhere.  I also in sharedUtils.cpp found  MAXIMUM_EDIT_VOXEL_MESSAGE_SIZE.  I think we should have some globals file with a single const like UDP_MTU = 1500, and then MAX_VOXEL_PACKET_SIZE = UDP_MTU - 1 (to account for headers or whatever).