last time using this was long time ago which is why I almost forgot everything about it.
So this time I’ll write it down to help remember it.
- display filter & capture filter :capture filter is what packets you really capture and display is what you want to see. We can use the configuration icon on the top left for fast choosing capture filter, Expression icon for display filter.
- DSCP:
Originally defined as the Type of service (ToS) field. This field is now defined by RFC 2474 (updated by RFC 3168 and RFC 3260) forDifferentiated services (DiffServ). New technologies are emerging that require real-time data streaming and therefore make use of the DSCP field. An example is Voice over IP (VoIP), which is used for interactive data voice exchange. https://en.wikipedia.org/wiki/IPv4#DSCP DiffServ uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. The DS field and ECN field replace the outdated IPv4 TOS field
- IntServ specifies a fine-grained QoS system, which is often contrasted with DiffServ’s coarse-grained control system. In order for IntServ to work, all routers along the traffic path must support it. Furthermore, many states must be stored in each router. As a result, IntServ works on a small-scale, but as you scale up to a system the size of the Internet, it is difficult to keep track of all of the reservations.[1]
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Per-hop behaviour
From Wikipedia, the free encyclopediaIn computer networking, per-hop behaviour (PHB) is a term used in differentiated services (DiffServ) or multiprotocol label switching(MPLS). It defines the policy and priority applied to a packet when traversing a hop (such as a router) in a DiffServ network.
Rule that governs how packets are handled within a diffserv[1] network is called the Per-Hop Behavior (PHB). PHBs are defined to support the general properties controlled by IP precedence. DSCP Contains 6-bits, PHBs are created (one for each combination of the top 3 bits) of the form bbb000 to match the precedence behaviors and leaves the other DSCP values open where each b may take the value zero or 1.
DSCP Bit Settings Meaning 000000 Best effort bbb000 Conforms to the requirements of Type of Service queuing precedence bbbbb0 Available for standardization bbbb11 For experimental of local network usage bbbb01 For experimental of local network usage, but may be taken for standardization Class selector values DSCP Binary Hex Decimal Typical application Examples CS0 (Default) 000 000 0x00 0 CS1 001 000 0x08 8 Scavenger YouTube, Gaming, P2P CS2 010 000 0x10 16 OAM SNMP,SSH,Syslog CS3 011 000 0x18 24 Signaling SCCP,SIP,H.323 CS4 100 000 0x20 32 Realtime TelePresence CS5 101 000 0x28 40 Broadcast video Cisco IPVS CS6 110 000 0x30 48 Network control EIGRP,OSPF,HSRP,IKE CS7 111 000 0x38 56 -
List of IP protocol numbers
From Wikipedia, the free encyclopediaThis is a list of IP numbers used in the Protocol field of the IPv4 header and the Next Header field of IPv6 header.
Decimal Hex Keyword Protocol References 0 0x00 HOPOPT IPv6 Hop-by-Hop Option RFC 2460 1 0x01 ICMP Internet Control Message Protocol RFC 792 2 0x02 IGMP Internet Group Management Protocol RFC 1112 3 0x03 GGP Gateway-to-Gateway Protocol RFC 823 4 0x04 IP-in-IP IP in IP (encapsulation) RFC 2003 5 0x05 ST Internet Stream Protocol RFC 1190, RFC 1819 6 0x06 TCP Transmission Control Protocol RFC 793 7 0x07 CBT Core-based trees RFC 2189 8 0x08 EGP Exterior Gateway Protocol RFC 888 9 0x09 IGP Interior Gateway Protocol (any private interior gateway (used by Cisco for their IGRP)) 10 0x0A BBN-RCC-MON BBN RCC Monitoring 11 0x0B NVP-II Network Voice Protocol RFC 741 12 0x0C PUP Xerox PUP 13 0x0D ARGUS ARGUS 14 0x0E EMCON EMCON 15 0x0F XNET Cross Net Debugger IEN 158 16 0x10 CHAOS Chaos 17 0x11 UDP User Datagram Protocol RFC 768 18 0x12 MUX Multiplexing IEN 90 19 0x13 DCN-MEAS DCN Measurement Subsystems 20 0x14 HMP Host Monitoring Protocol RFC 869 21 0x15 PRM Packet Radio Measurement 22 0x16 XNS-IDP XEROX NS IDP 23 0x17 TRUNK-1 Trunk-1 24 0x18 TRUNK-2 Trunk-2 25 0x19 LEAF-1 Leaf-1 26 0x1A LEAF-2 Leaf-2 27 0x1B RDP Reliable Datagram Protocol RFC 908 28 0x1C IRTP Internet Reliable Transaction Protocol RFC 938 29 0x1D ISO-TP4 ISO Transport Protocol Class 4 RFC 905 30 0x1E NETBLT Bulk Data Transfer Protocol RFC 998 31 0x1F MFE-NSP MFE Network Services Protocol 32 0x20 MERIT-INP MERIT Internodal Protocol 33 0x21 DCCP Datagram Congestion Control Protocol RFC 4340 34 0x22 3PC Third Party Connect Protocol 35 0x23 IDPR Inter-Domain Policy Routing Protocol RFC 1479 36 0x24 XTP Xpress Transport Protocol 37 0x25 DDP Datagram Delivery Protocol 38 0x26 IDPR-CMTP IDPR Control Message Transport Protocol 39 0x27 TP++ TP++ Transport Protocol 40 0x28 IL IL Transport Protocol 41 0x29 IPv6 IPv6 Encapsulation RFC 2473 42 0x2A SDRP Source Demand Routing Protocol RFC 1940 43 0x2B IPv6-Route Routing Header for IPv6 RFC 2460 44 0x2C IPv6-Frag Fragment Header for IPv6 RFC 2460 45 0x2D IDRP Inter-Domain Routing Protocol 46 0x2E RSVP Resource Reservation Protocol RFC 2205 47 0x2F GRE Generic Routing Encapsulation RFC 2784, RFC 2890 48 0x30 MHRP Mobile Host Routing Protocol 49 0x31 BNA BNA 50 0x32 ESP Encapsulating Security Payload RFC 4303 51 0x33 AH Authentication Header RFC 4302 52 0x34 I-NLSP Integrated Net Layer Security Protocol TUBA 53 0x35 SWIPE SwIPe IP with Encryption 54 0x36 NARP NBMA Address Resolution Protocol RFC 1735 55 0x37 MOBILE IP Mobility (Min Encap) RFC 2004 56 0x38 TLSP Transport Layer Security Protocol (using Kryptonet key management) 57 0x39 SKIP Simple Key-Management for Internet Protocol RFC 2356 58 0x3A IPv6-ICMP ICMP for IPv6 RFC 4443, RFC 4884 59 0x3B IPv6-NoNxt No Next Header for IPv6 RFC 2460 60 0x3C IPv6-Opts Destination Options for IPv6 RFC 2460 61 0x3D Any host internal protocol 62 0x3E CFTP CFTP 63 0x3F Any local network 64 0x40 SAT-EXPAK SATNET and Backroom EXPAK 65 0x41 KRYPTOLAN Kryptolan 66 0x42 RVD MIT Remote Virtual Disk Protocol 67 0x43 IPPC Internet Pluribus Packet Core 68 0x44 Any distributed file system 69 0x45 SAT-MON SATNET Monitoring 70 0x46 VISA VISA Protocol 71 0x47 IPCU Internet Packet Core Utility 72 0x48 CPNX Computer Protocol Network Executive 73 0x49 CPHB Computer Protocol Heart Beat 74 0x4A WSN Wang Span Network 75 0x4B PVP Packet Video Protocol 76 0x4C BR-SAT-MON Backroom SATNET Monitoring 77 0x4D SUN-ND SUN ND PROTOCOL-Temporary 78 0x4E WB-MON WIDEBAND Monitoring 79 0x4F WB-EXPAK WIDEBAND EXPAK 80 0x50 ISO-IP International Organization for Standardization Internet Protocol 81 0x51 VMTP Versatile Message Transaction Protocol RFC 1045 82 0x52 SECURE-VMTP Secure Versatile Message Transaction Protocol RFC 1045 83 0x53 VINES VINES 84 0x54 TTP TTP 84 0x54 IPTM Internet Protocol Traffic Manager 85 0x55 NSFNET-IGP NSFNET-IGP 86 0x56 DGP Dissimilar Gateway Protocol 87 0x57 TCF TCF 88 0x58 EIGRP EIGRP 89 0x59 OSPF Open Shortest Path First RFC 1583 90 0x5A Sprite-RPC Sprite RPC Protocol 91 0x5B LARP Locus Address Resolution Protocol 92 0x5C MTP Multicast Transport Protocol 93 0x5D AX.25 AX.25 94 0x5E IPIP IP-within-IP Encapsulation Protocol RFC 2003 95 0x5F MICP Mobile Internetworking Control Protocol 96 0x60 SCC-SP Semaphore Communications Sec. Pro 97 0x61 ETHERIP Ethernet-within-IP Encapsulation RFC 3378 98 0x62 ENCAP Encapsulation Header RFC 1241 99 0x63 Any private encryption scheme 100 0x64 GMTP GMTP 101 0x65 IFMP Ipsilon Flow Management Protocol 102 0x66 PNNI PNNI over IP 103 0x67 PIM Protocol Independent Multicast 104 0x68 ARIS IBM’s ARIS (Aggregate Route IP Switching) Protocol 105 0x69 SCPS SCPS (Space Communications Protocol Standards) SCPS-TP[1] 106 0x6A QNX QNX 107 0x6B A/N Active Networks 108 0x6C IPComp IP Payload Compression Protocol RFC 3173 109 0x6D SNP Sitara Networks Protocol 110 0x6E Compaq-Peer Compaq Peer Protocol 111 0x6F IPX-in-IP IPX in IP 112 0x70 VRRP Virtual Router Redundancy Protocol, Common Address Redundancy Protocol (not IANA assigned) VRRP:RFC 3768 113 0x71 PGM PGM Reliable Transport Protocol RFC 3208 114 0x72 Any 0-hop protocol 115 0x73 L2TP Layer Two Tunneling Protocol Version 3 RFC 3931 116 0x74 DDX D-II Data Exchange (DDX) 117 0x75 IATP Interactive Agent Transfer Protocol 118 0x76 STP Schedule Transfer Protocol 119 0x77 SRP SpectraLink Radio Protocol 120 0x78 UTI Universal Transport Interface Protocol 121 0x79 SMP Simple Message Protocol 122 0x7A SM Simple Multicast Protocol draft-perlman-simple-multicast-03 123 0x7B PTP Performance Transparency Protocol 124 0x7C IS-IS over IPv4 Intermediate System to Intermediate System (IS-IS) Protocol over IPv4 RFC 1142 and RFC 1195 125 0x7D FIRE Flexible Intra-AS Routing Environment 126 0x7E CRTP Combat Radio Transport Protocol 127 0x7F CRUDP Combat Radio User Datagram 128 0x80 SSCOPMCE Service-Specific Connection-Oriented Protocol in a Multilink and Connectionless Environment ITU-T Q.2111 (1999) 129 0x81 IPLT 130 0x82 SPS Secure Packet Shield 131 0x83 PIPE Private IP Encapsulation within IP Expired I-D draft-petri-mobileip-pipe-00.txt 132 0x84 SCTP Stream Control Transmission Protocol 133 0x85 FC Fibre Channel 134 0x86 RSVP-E2E-IGNORE Reservation Protocol (RSVP) End-to-End Ignore RFC 3175 135 0x87 Mobility Header Mobility Extension Header for IPv6 RFC 6275 136 0x88 UDPLite Lightweight User Datagram Protocol RFC 3828 137 0x89 MPLS-in-IP Multiprotocol Label Switching Encapsulated in IP RFC 4023 138 0x8A manet MANET Protocols RFC 5498 139 0x8B HIP Host Identity Protocol RFC 5201 140 0x8C Shim6 Site Multihoming by IPv6 Intermediation RFC 5533 141 0x8D WESP Wrapped Encapsulating Security Payload RFC 5840 142 0x8E ROHC Robust Header Compression RFC 5856 143-252 0x8F-0xFC UNASSIGNED 253-254 0xFD-0xFE Use for experimentation and testing RFC 3692 255 0xFF Reserved. Internet protocol suite Application layer Transport layer Internet layer Link layer
Streaming Media Protocol
To follow all this, I recommend adding these fields as columns:
- TCP length (tcp.len)
- Sequence number (tcp.seq)
- Next expected sequence number (tcp.nxtseq)
- Acknowledgment number (tcp.ack)
There the follwing length now:
Frame length: Total length of the Frame, including the Padding Fields (if present and needed) of the Ethernet Layer
Captured Length: Frame Length which is captured (Interresting if a filter has been used)
IP.TotalLength: Total Packet Length. from IP-Header until Layer 7 payload ends
TCP.SegmentLegth: Resulting TCP Payload and only calculated by Wireshark
TCP.HeaderLength: Is the length of the TCP Header, because header size is variabel
Identification of TCP stream in wireshark
https://www.appneta.com/blog/how-to-easily-capture-tcp-conversation-streams/
TSHARK
https://ask.wireshark.org/questions/4677/easy-way-to-save-tcp-streams
