How does ipv6 do arp

If the underlying data link protocol supports multicasting, like Ethernet does, the Neighbor Solicitation message is not broadcast. Instead, it is sent to the solicited-node address of the device whose IPv6 address we are trying to resolve.

So A won't broadcast the message, it will multicast it to device B 's solicited-node multicast address. Device A then adds device B 's information to its neighbor cache. For efficiency, cross-resolution is supported as in IPv4 address resolution. This is done by having Device A include its own layer two address in the Neighbor Solicitation , assuming it knows it. Please Whitelist This Site? Thanks for your understanding! NOTE: Using software to mass-download the site degrades the server and is prohibited.

Thank you. The Book is Here Secondly, what is the use of ARP? The Address Resolution Protocol ARP is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address.

This mapping is a critical function in the Internet protocol suite. ARP is layer 2. The reason being is that a broadcast is sent on layer 2 data link layer and ARP will normally not traverse to layer 3 network layer. However it can provide extra features to the layer 3 protocol. The truth is that not all protocols fit the OSI model exactly, because after all it's just a model. A host sends a multicast Router Solicitation message to prompt IPv6 routers to respond immediately, rather than waiting for an unsolicited Router Advertisement message.

When enabled, messages are sent by the router periodically and in response to solicitations. A host uses the information to learn the prefixes and parameters for the local network.

This ensures that the claimed source of an NDP message is the owner of the claimed address. Anatomy of an ARP spoofing attack Generally, the goal of the attack is to associate the attacker's host MAC address with the IP address of a target host, so that any traffic meant for the target host will be sent to the attacker's host.

Link - Layer Addressing. The main purpose of a router is to connect multiple networks and forward packets destined either for its own networks or other networks. A router is considered a layer-3 device because its primary forwarding decision is based on the information in the layer-3 IP packet, specifically the destination IP address.

Ping measures the round-trip time for packets between this host and a destination host. This test uses 5 pings over IPv4 and IPv6. A response for both IPv4 and IPv6 means that the host is accessible over both protocols. The full command is netsh interface ipv6 show neighbors , but the Windows built-in netsh allows you to abbreviate commands.

You may notice some duplicate and unreachable physical MAC addresses. The unreachables are due to privacy addresses. My Windows boxes by default use temporary IPv6 addresses than change periodically to attempt some measure of privacy. Most machines will have the public IPv6 address and a link-local IPv6 address, usually starting with fe I will also draw your attention to the fact that the physical MAC address is transliterated and somewhat recognizable in the internet address for link local addresses and most non-private addresses.