Please Whitelist This Site?
I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)
If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.
If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.
Thanks for your understanding!
Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide
NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.
IPv6 Multicast and Anycast Addressing
(Page 4 of 5)
Solicited-Node Multicast Addresses
In addition to the regular multicast
addresses, each unicast address has a special multicast address called
its solicited-node address. This address is created through a
special mapping from the devices unicast address. Solicited-node
addresses are used by the IPv6
Neighbor Discovery (ND) protocol to provide
efficient address resolution than the
ARP technique used in IPv4.
All solicited-node addresses have
their T flag set to zero and a scope ID of 2, so they start with
FF02. The 112-bit group ID is broken down as follows (see
Figure 103: IPv6 Solicited Node Address Calculation
The solicited node multicast address is calculated from a unicast address by taking the last 24 bits of the address and prepending them with the IPv6 partial address FF02:0:0:0:0:1:FF. This shows the example address from Figure 95 converted to its solicited node address, FF02::1:FFC8:1FFF.
- 80 bits consisting of 79 zeroes followed by a
single one; this means that in colon hexadecimal notation, the next
five hexadecimal values are 0000:0000:0000:0000:0001, or
more succinctly, 0:0:0:0:1.
- 8 ones: FF.
- 24 bits taken from the bottom 24 bits of its
So, these addresses start with FF02:0:0:0:0:1:FF
followed by the bottom 24 bits of the unicast address. So, the node
with IP address 805B:2D9D:DC28:0:0:FC57:D4C8:1FFF would have a solicited-node
address of FF02:0:0:0:0:1:FFC8:1FFF (or FF02::1:FFC8:1FFF).
Key Concept: Each unicast address has an equivalent solicited-node multicast address, which is created from the unicast address and used when other devices need to reach it on the local network.
|If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!|
Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.