ipv6 Next Header field

Posted on 2013-09-18
Medium Priority
Last Modified: 2013-10-03
If my Next Header field as the protocol number 58 which is icmp. Where can I find the ICMP header, in the Extension Header?
Question by:leblanc
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Accepted Solution

aadih earned 2000 total points
ID: 39503682
A value of 58 in the Next Header field of the basic IPv6 packet header identifies an IPv6 ICMP packet.

ICMP packets in IPv6 are like a transport-layer packet in the sense that the ICMP packet follows all the extension headers and is the last piece of information in the IPv6 packet.

Author Comment

ID: 39504471
So ICMP header is in the Extension Header. Correct?
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Assisted Solution

aadih earned 2000 total points
ID: 39504486
My understanding: Not "in". "Follows" it. That is "after" it.  

From the RFC: " Every ICMPv6 message is preceded by an IPv6 header and zero or more IPv6 extension headers."

Reference: < http://tools.ietf.org/html/rfc4443 >

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