February 2000
Intermediate to advanced
464 pages
15h 57m
English
Content preview from Internet Core Protocols: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
The IP Multicasting and IGMP Specifications
IP multicasting is documented in RFC 1112, which is included in STD 5 (the IP standard). As such, IP multicasting is a part of STD 5, and is therefore considered to be an Internet Standard protocol. All hosts are required to implement multicasting into their IP stacks if they are to be compliant with Internet standards.
In addition to the IP multicasting services, RFC 1112 also defined IGMPv1, a follow-up to IGMPv0 (originally published in RFC 998). IGMPv2 was introduced in RFC 2236 as an update to IGMPv1, and has gained a substantial number of implementations. Some IGMP implementations only support IGMPv1 while others support IGMPv2 and v1.[1]
Of the differences between IGMPv1 and v2, the most notable addition in IGMPv2 was the addition of the “Leave Report” message, which allows a host to inform the network that it is no longer interested in receiving IP datagrams for a specific multicast group. This feature is required for networks that use data-link services that do not support multicasting directly (such as PPP). This chapter focuses on IGMPv2 primarily, and only mentions IGMPv1 when there is a significant difference.
RFC 2236 states that the Protocol ID for IGMP is 2. When a system receives an IP datagram that is marked as containing Protocol 2, it should pass the contents of the datagram to IGMP for further processing. However, note that IGMP is not a transport protocol and is not used for the delivery of multicast data. Rather, ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.