finding the multicast address in wireshark packet capture

My test setup is as shown in Figure 1 below. Watch this great 10-min video by Rick Graziani (Cisco Press) to understand these message types.Īll of these messages should use link-local addresses ( FE80::/64) as their source and a hop limit of 255 (for security reasons). Redirects are used by routers to inform hosts of a better first-hop for a destination. A node may also send unsolicited NAs to announce a link-layer address change. NA - Neighbor Advertisement (ICMPv6 type 136)Ī Neighbour Advertisement (NA) message is sent in response to an NS message.NSes are also used for Duplicate Address Detection (DAD). NS - Neighbor Solicitation (ICMPv6 type 135)Ī Neighbor Solicitation (NS) message is sent by a node to determine the link-layer address of a neighbor, or to verify that a neighbor is still reachable via a cached link-layer address.RAs contain prefixes that are used for determining whether another address shares the same link (on-link determination) and/or address configuration, a suggested hop limit value, and so forth.

Routers advertise their presence together with various link and Internet parameters either periodically, or in response to an RS message. RA - Router Advertisement (ICMPv6 type 134).When an interface becomes enabled, hosts may send out RSes that request that routers generate Router Advertisements (RAs) immediately rather than at their next scheduled time. RS - Router Solicitation (ICMPv6 type 133).There are five different ICMPv6 message types defined in RFC 4861, which are: In this post, we will look at basic Neighbor Discovery messages used in IPv6.

Finding the multicast address in wireshark packet capture