Sunday, December 14, 2014

Basics of IP, ICMP

IP Internet Protocol 

IP is the internet layer. It uses each packet’s Address. It uses routing Table by which it decides where a packet is to be sent choosing its best path

An IP Header feature are as below;
  • Version : it describes IP version no.
  • Header length: HLEN in 32 bit
  • Priority & Type of Service: It describes how the datagram should be handled.
  • Total Length: Length of the packet including header & data.
  • Identification: Unique IP Packet value used to differentiate fragmented packets from diff data grams.
  • Flags : Specifies whether fragmentation should occur.
  • Fragment offset: provides fragmentation & allows different maximum transmission unit MTUS on the internet.
  • TTL : Time to Leave: TTL is set in to the packet when generated for reaching at destination within time limit. Otherwise it get Lost.
  • Protocol : Port of upper layer protocol. (tcp-6 & udp-17)
  • Header Check sum: CRC (Cyclic Redundancy Check Only) on header.
  • Source IP Address: 32-bit IP address of Sender.
  • Destination IP address: 32-bit IP address of Receiver/ Destination .
  • Options: It is Used for testing [ network, debug, security].
  • Data: After the IP option field is the upper layer data.



   ICMP : Internet Control Message Protocol parameters

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