How to Analyze Network Protocols

Being able to support more than 300 protocols in the latest version, Capsa Network Sniffer makes it easy to analyze protocols in network and understand what is happening.
Sort by protocol layers. (Go to see Index of Protocols, or What Are Network Protocols.)

Please visit protocolbase.net for the description of commonly used packets and download packet samples.

Application Layer

COPSCommon Open Policy Service Protocol
FANPFlow Attribute Notification Protocol
FingerFinger Protocol
FTPFile Transfer Protocol
HTTPHypertext Transfer Protocol
IMAP4Internet Message Access Protocol
IPDCIP Device Control Protocols
ISAKMPInternet Message Access Protocol
NTPNetwork Time Protocol
POP3Post Office Protocol version 3
RadiusRadius Protocol
RLOGINRlogin Protocol
RTSPReal-Time Streaming Protocol
SCTPStream Control Transmission Protocol
S-HTTPSecure HTTP Protocol
SLPService Location Protocol
SMTPSimple Mail Transfer Protocol
SNMPSimple Network Management Protocol
SOCKS V5SOCK V5 Protocol
TACACSTACACS+ Protocol
TELNETTerminal Emulation Protocol
TFTPTrivial File Transfer Protocol
WCCPWeb Cache Coordination Protocol
X-WindowX Window System Protocol

Data Link Layer

ARP/RARPAddress Resolution Protocol (ARP) and Reverse Address Resolution Protocol (RARP)
DCAPData Link Switching Client Access Protocol
ATMPAscend Tunnel Management Protocol
L2FLayer 2 Forwarding protocol
L2TPLayer Two Tunneling Protocol
PPTPPoint to Point Tunneling Protocol

Network Layer

DHCPDynamic Host Configuration Protocol
DVMRPDistance Vector Multicast Routing Protocol
ICMPInternet Control Message Protocol
ICMPv6Internet Control Message Protocol
IGMP Internet Group Management Protocol
IPInternet Protocol
IPv6IP version 6
MARSMulticast Address Resolution Server
PIMProtocol Independent Multicast-Sparse Mode
RIP2Routing Information Protocol
RIPng for IPv6Routing Protocol for the IPv6
RSVPResource ReSerVation setup Protocol
VRRPVirtual Router Redundancy Protocol
OSPFOpen Shortest Path First
NHRPNBMA Next Hop Resolution Protocol
NARPNBMA Address Resolution Protocol
IGRPInterior Gateway Routing Protocol
HSRPHot Standby Router Protocol
EIGRPEnhanced Interior Gateway Routing Protocol
EGPExterior Gateway Protocol
BGP-4Border Gateway Protocol
AHIP Authentication Header
ESPIP Encapsulating Security Payload

Session Layer

DNSDomain Name Service Protocol
LDAPLightweight Directory Access Protocol
NetBIOS/IPNetBIOS/IP Protocol

Transport Layer

Mobile IPMobile IP protocol
RUDPReliable User Datagram Protocol
TALITransport Adapter Layer Interface Protocol
TCPTransmission Control Protocol
UDPUser Datagram Protocol
Van JacobsonVan Jacobson Protocol
XOTX.25 over TCP Protocol