Internet Communications Using SIP : Delivering VoIP and Multimedia Services With Session Initiation Protocol {2Nd Ed.}

Figure 18.5 Sample of P2P and other Internet traffic

A Summary of Internet QoS Technologies

Network quality of service is a very complex topic. Table 18.2 provides a very
short summary.

Table 18.2 Network Technologies for Quality of Service

OPTION FOR HIGHLIGHTS AND

NETWORK QOS ISSUES

Network Layer Best effort Used on the Internet at present.

Requires overprovisioning of

bandwidth.

Differentiated Services Per-hop IP routing behavior

(DiffServ or DS) RFC 2475, defined by the DS Code Points

3086 (DSCP) for Expedited Forwarding

and Assured Forwarding.

Stateless approach with minimal

complexity.

Resource Reservation The endpoint (host) requests

Protocol (RSVP) RFC 2205 specific end-to-end reservations

along the routing path.

(continued)

DirectConnect

BitTorrent

edonkey

Kazaa

WinMX

Gnutella

Napster

nntp

hhttp

https

ssh

ftp

smtp

muut

BitTorrent

44%

edonkey

18%

http://linuxreviews.org/news/2004/11/05_p 2 p/

Kazaa

4%

nntp

1%

http

5%

muut

7%

https

1%

ssh

1% 0%ftp

smtp

0%

WinMX

1%

Gnutella

0%

Napster

0%

Other

14%

DirectConnect

18%

Quality of Service for Real-Time Internet Communications 311