video

Tutor: Kazuhiko Yamamoto, Jun'ichiro Hagino [IPv6 Tutorial]

Problems of IPv4

• Exhaustion of IPv4 addresses
  
  
  • 4 bytes = 4.3 billion
    
    
    • Much less than the human population (6.1 billion)
      
      
  • Will be exhausted in around 2008
    
    
  • Registries are allocating IPv4 addresses by severe policy
    
    
    • Nobody can obtain enough IPv4 addresses
      
      
• Increment of routing information
  
  
  • Routing information cannot be aggregated effectively
    
    
    • Unaggregatable address assignments
      
      
  • 80,000 entries at present
    
    
  • Burden for backbone routers
    
    
    • Unstability, accidents
      
      
• Proliferation of NAT
  
  
  • Breaking the Internet architecture