IPv6 design, deployment, standards, and best practices.
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Wed Mar 13, 2013 9:22 pm

How to find ND - Neighbor solicitation packet has options ?

Thu Sep 04, 2014 5:27 pm

I am trying to write a parsing functions for ND packets(ICMPv6 packet). I am wondering how to find out whether the Neighbor solicitation message has the options field or not. I read through the RFC4861

4.3. Neighbor Solicitation Message Format

Possible options:

Source link-layer address
The link-layer address for the sender. MUST NOT be
included when the source IP address is the
unspecified address. Otherwise, on link layers
that have addresses this option MUST be included in
multicast solicitations and SHOULD be included in
unicast solicitations.
But I am not able to find out any clarification on that. Is there any corresponding bit that will tell about the presence of option fields ?

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