Multicast architecture in Linux - PowerPoint PPT Presentation

About This Presentation
Title:

Multicast architecture in Linux

Description:

Title: Multicast architecture in Linux Author: lbarza Last modified by: lbarza Created Date: 2/21/2001 2:13:28 PM Document presentation format: Affichage l' cran – PowerPoint PPT presentation

Number of Views:24
Avg rating:3.0/5.0
Slides: 12
Provided by: lba87
Category:

less

Transcript and Presenter's Notes

Title: Multicast architecture in Linux


1
Multicast architecture in Linux
Laurentiu Barza
Feb. 22, 2001
2
Conformance levels
  • Level 0 no support for multicast
  • Level 1 sending, but not receiving
  • Level 2 full support for IP multicasting

3
Linux multicast routing forwarding
(4)
Linux kernel
Forwarding
(3)
(1)
(2)
Multicast routing algorithm
Multicast routing table
4
Linux multicast programming
int setsockopt (int s, int level, int optname,
const void optval, int optlen) int getsockopt
(int s, int level, int optname, void optval,
int optlen) s the socket the system call
applies to level layer which handle the
option optname identifies the option we are
setting/getting optval the value taken by the
option optlen the size of data structure
optval
5
Linux multicast programming
  • The optname values involved in multicast
    programming
  • IP_MULTICAST_IF set/get IP multicast
    interface.
  • IP_MULTICAST_TTL set/get IP multicast ttl
  • IP_MULTICAST_LOOP set/get IP multicast
    loopback
  • IP_ADD_MEMBERSHIP add an IP group membership
  • IP_DROP_MEMBERSHIP drop an IP group membership

6
Linux multicast programming- IGMPv3 specific
options -
  • For some applications all the sources are
    accepted, for others only souces in a given list
    are allowed.
  • IP_BLOCK_SOURCE mute a specific source
  • IP_UNBLOCK_SOURCE un-mute the source
  • IP_ADD_SOURCE_MEMBERSHIP add a specific
    source
  • IP_DROP_SOURCE_MEMBERSHIP drop a specific
    souce
  • IP_DROP_MEMBERSHIP drop all sources
  • IP_MULTICAST_FILTER set multicast filter

7
MGEN test tool
  • IP network performance measurements using UDP/IP
    unicast and multicast traffic
  • generate real traffic patterns periodic, poisson
  • possibility to control packet size and
    transmission rate, RSVP, TOS settings
  • fixed-parameter mode, script mode
  • distributed with utility programs parses log
    files and outputs statistics

8
MGEN test scenarios
  • Unicast source -gt receiver
  • Multicast one-to-one
  • Multicast one-to-many all the receivers in the
    same network
  • Multicast one to many the receivers are in
    different networks

9
SSM current developments
  • IGMPv3 by Sprint
  • IGMPv3 lite by Cisco
  • solution for application developers to
    immediately start programming SSM applications
  • URD host signaling
  • allows existing IP multicast receiver
    applications to be used with SSM without the need
    to modify the application

10
Future work
  • Context the Internet is changing
  • Content Distribution Networks (CDN) an overlay
    for the Internet
  • performance lower latency
  • bandwidth arbitrage push the content where the
    bandwidth is cheaper
  • flash crowd control load balancing
  • bandwidth multiplication

11
Future work
  • Utilize multicast (SSM) in CDN networks

user
Main site (source)
cache
Write a Comment
User Comments (0)
About PowerShow.com