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IPv4 header

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4 replies

by nicole_howard

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What field of the IPv4 header identifies where a fragemnt belogns in relation to the original packet? Identification, version or type?

4 replies

by ghstinshll

I think that the Identification holds that answer, with a sequential number being sent on every packet, allowing the sender to know whether each packet is received or not because of ACK's from each packet, or something like that.

by homekeys

The first is the version. but it is ussully 4 unless you are in ip v 6 shop. usually represended with hex code of 45. this means it is version 4 with a lenth of 5

then ihl internet header length field.

then the tos type of service

then total length

the hex xx xx four in length

then the identification a number

then the flag frag no frag

then the frag offset

with the the ttl, protocol, and checksum.

by homekeys

it is identification with the flag and frag that define frags locations if i am wrong please correct me.

by vze393zf

Hi.

Read this PDF file...it will step you through understanding IP Packet Fragmentation...why packets are fragmented (which I'm sure you already know) and give the exact parameters that need to be set in the newly created fragment packets in order for them to be reassebled at the target destination host.

http://www.site.uottawa.ca/~awilliam/seg3150/Notes-12.pdf

Take care.

Pete

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