how to convert a string into network mac address

The target replies with a unicast neighbour advertisement. In v6 neigbour solicitation requests are sent to a multicast address generated from the next hop address. This is normally broadcast but in some cases if the host has a stale entry it may try a unicast request first and only fall back to broadcast if that fails. The mechnisms here differ a bit between v4 and v6. If it doesn't have a usable entry it puts packets destined for that next-hop on hold and sends out a request to find the MAC address. If it finds a non-stale entry there then it has the MAC address it needs and can send the packet. Ethernet etc), the OS then looks up the next hop in it's arp (ipv4) or neighbour discovery (ipv6) table. If the packet is to be sent out on a multipoint link layer (e.g. Note that the next-hop IP address is a purely local concept, it never becomes part of a packet sent on the wire. If no next hop is specified in the routing table the IP of the destination is used as the next hop.

What the IP address of the next hop is.

TryParse(ReadOnlySpan, PhysicalAddress) Tries to convert the span representation of a hardware address to a PhysicalAddress instance.

ToString() Returns the String representation of the address of this instance. What interface the packet should be sent through. Parses the specified String and stores its contents as the address bytes of the PhysicalAddress returned by this method.The network stack first looks up the destination IP in it's routing table, from this it determines two things. Thus, the soliciting node learns the MAC-address of the target node.Īnd yes, NDP-spoofing works much like ARP-spoofing. On receipt, the target node answers with its Neighbor Advertisement, which is sent to the unicast address (link layer and IPv6) of the soliciting node.

The Neighbor Solicitation contains also the unicast IPv6 addresses and the MAC address of the soliciting system. All nodes with an address ending on *55:6677 belong to that multicast group and will listen to that - this is most likely only the target system itself. A node that wants to learn a link-layer address for a particular IP address sends a Neighbor Solicitation to the according link-local solicited-node multicast address - there is no broadcast for IPv6 any more.įor example, if the address in question is 2001:db8::0011:2233:4455:6677, then the according solicited-node multicast address is ff02::1:ff55:6677, and the according ethernet multicast address is 33:33:ff:55:66:77. The NDP provides two message types that are of interest here: Neighbor Solicitation and Neighbor Advertisement. Thus, you must not ignore ICMPv6 and filter it away, as is the custom with legacy IP. The mapping between layer 2 and IPv6 addresses is done by the Neighbor Discovery Protocol (NDP), which is sent over ICMPv6. To begin with, there is no such thing as ARPv6. Since the question was tagged with IPv6, I'll answer for that because IPv6 is very different from IPv4.

How to convert a string into network mac address