한국어

네트워킹

온누리070 플레이스토어 다운로드
    acrobits softphone
     온누리 070 카카오 프러스 친구추가온누리 070 카카오 프러스 친구추가친추
     카카오톡 채팅 상담 카카오톡 채팅 상담카톡
    
     라인상담
     라인으로 공유

     페북공유

   ◎위챗 : speedseoul


  
     PAYPAL
     
     PRICE
     

pixel.gif

    before pay call 0088 from app


 

http://bogpeople.com/networking/dscp.shtml

IP Precedence, TOS & DSCP

The IP Type of Service Header Field

The Type of Service field in the IP header was originally defined in RFC 791. It defined a mechanism for assigning a priority to each IP packet as well as a mechanism to request specific treatment such as high throughput, high reliability or low latency.

In practice, only the IP Precedence part of the field was ever used. At its simplest, the higher the value of the IP Precedence field, the higher the priority of the IP packet. Simple...

In RFC 2474 the definition of this entire field was changed. It is now called the "DS" (Differentiated Services) field and the upper 6 bits contain a value called the "DSCP" (Differentiated Services Code Point). Since RFC 3168, the remaining two bits (the two least siginficant bits) are used for Explicit Congestion Notification.

The diagram below illustrates the relationship between the bits in the Type of Services/Differeniated Services field in the IP header:-

Type of Service (TOS) X X X X X X X 0
7 6 5 4 3 2 1 0
Differentiated Services (DS) X X X X X X X X

Interpretation of the TOS/DS Field

RFC791/RFC1349 Interpretation

Bits Meaning
7-5 IP Precedence:
111 Network Control
110 Internetwork Control
101 Critic/ECP
100 Flash Override
011 Flash
010 Immediate
001 Priority
000 Routine
4 1 = Low Delay; 0 = Normal Delay
3 1 = High Throughput; 0 = Normal Throughput
2 1 = High Reliability; 0 = Normal Reliability
1 1 = Minimise monetary cost (RFC 1349)
0 Must be 0

RFC 2474 (Differentiated Services) Interpretation

Bits Meaning
7-2 DSCP
1-0 ECN (Explicit Congestion Notification)


 

The DSCP

The most signficant three bits of the DSCP (corresponding directly to the IP Precedence) are referred to as the Class Selector.

DSCP <=> IP Precedence Conversion Table

DSCP Name DS Field Value

IP Precedence
Binary Decimal
CS0 000 000 0 0
CS1 001 000 8 1
AF11 001 010 10 1
AF12 001 100 12 1
AF13 001 110 14 1
CS2 010 000 16 2
AF21 010 010 18 2
AF22 010 100 20 2
AF23 010 110 22 2
CS3 011 000 24 3
AF31 011 010 26 3
AF32 011 100 28 3
AF33 011 110 30 3
CS4 100 000 32 4
AF41 100 010 34 4
AF42 100 100 36 4
AF43 100 110 38 4
CS5 101 000 40 5
EF 101 110 46 5
CS6 110 000 48 6
CS7 111 000 56 7

CS Class Selector (RFC 2474)
AFxy Assured Forwarding (x=class, y=drop precedence) (RFC2597)
EF Expedited Forwarding (RFC 3246)

References


:-)
Back to BogPeople.com
조회 수 :
82648
등록일 :
2012.01.06
00:59:40 (*.160.42.233)
엮인글 :
http://webs.co.kr/index.php?document_srl=674&act=trackback&key=62a
게시글 주소 :
http://webs.co.kr/index.php?document_srl=674
List of Articles
번호 제목 글쓴이 날짜 조회 수
34 a b c class Subnet Mask Cheat Sheet admin 2019-10-16 19870
33 Apple 소프트웨어 제품에서 사용하는 TCP 및 UDP 포트 admin 2019-04-19 27759
32 windows linux whois ip domain 도메인 아이피 소유자 확인 명령어 admin 2019-02-16 136778
31 route 및 iptables를 이용한 리눅스 특정 IP 접속 차단하는 법 admin 2018-04-15 21673
30 IPv6와 IPv4의 차이점 기존의 IPv4의 문제점 admin 2018-04-15 18279
29 사례를 통해 알아가는 실전 패킷분석 A 기업의 UDP 트래픽 급증의 원인은 admin 2018-04-15 13439
28 리눅스 linux 현재 사용중인 랜카드 트래픽 대역폭 확인 프로그램 nload admin 2017-11-04 32857
27 whois site ip owner check admin 2015-08-03 19185
26 TCP flag(URG, ACK, PSH, RST, SYN, FIN) admin 2014-04-05 87600
25 ping 핑 에 의한 패킷 전송 10 단계 그림으로 설명 file admin 2014-02-13 35761
24 Cisco - CCNP, CCIE - QoS. Quality Of Service admin 2013-08-29 75137
23 Securing Networks Access List Implementation on Cisco Routers admin 2013-08-02 186930
22 Analyzing High CPU Utilization Issues on Cisco Catalyst 6500 Series admin 2013-08-01 34361
21 ping 설명 ICMP Internet Control Message Protocol 설명 여러가지 admin 2013-05-09 127831
20 네트웍을 공부하려고 하는분 네이버 네트워크 전문가 따라 잡기 카페 admin 2013-04-20 79656
19 List of TCP and UDP port numbers admin 2013-04-16 78027
18 3com tftp damon program 3cdv2r10 file admin 2013-03-17 30889
17 VLAN Tagging - Understanding VLANs Ethernet Frames admin 2013-03-11 97676
16 Cisco Catalyst Fixed Configuration Layer 2 and Layer 3 Switches admin 2013-01-30 51148
15 Quality of Service Guide - QOS admin 2012-01-06 72934
» IP Precedence, TOS & DSCP admin 2012-01-06 82648
13 [Cisco] NAT Config 해설 admin 2011-12-19 279518
12 트래픽관리를 위한 MRTG 서버구축 admin 2011-12-16 39748
11 Brocade FastIron GS Series manuall file admin 2011-12-16 132566
10 CAT.6 UTP 케이블링 작업 요령 file admin 2011-12-16 39815
9 윈도우에서 특정아이피 차단 설정 하기 admin 2011-12-16 43487
8 GRE Tunnel /VPN admin 2011-12-16 33887
7 VLAN과 TRUNK admin 2011-12-16 31158
6 와룡의 네트워크 카페에서 라우팅 ,스위칭공부 admin 2011-12-16 36218
5 방화벽 자료 admin 2011-12-16 31001