Data-Centric Network (Unit 5)

IP Services

IP Datagram

IP Header

• Version - IPv4 or IPv6
• Header Length - Storage of all required headers.
• Identification - Finding the datagram.
• Flags - Used under fragmentation.
• TTL - The time before the packet will be dropped.
• Protocol
  
  
  
• Header Checksum - Integrity of the data maintained.
• Options
• Padding

IP Fragmentation

IPv4 Issues

• No route aggregation - Minimize the routing table complexity.
• Address space exhaustion
• Lack of quality of service
• Limited mobility
• Security layer issue

IPv6

• Version number
• Flow label - Label packet requests handle by routers.
• Traffic class - Identification and marking class types of packet.
• Payload length
• Next header
• Hop limit
• Source address
• Destination address
• Flow Label - Maintains a table with an entry and exit definition for the IPv6 routing.
  

IPv6 VS IPv4

Extension header types

• Hop by Hop
• Destination
• Source Routing
• Fragmentation
• Authentication
• ESP

MPLS

Link state routing & algorithms

• OSPF - Link state routing protocol with Shortest Path First algorithm.
• BGP - Exchange routing information for the internet.
• EGP - Finding network path information.