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OSI layer

Layer	Name	Description
7	Application	e.g. HTTP, SMTP, SNMP, FTP, Telnet, SSH and Scp, NFS, RTSP etc.
6	Presentation	e.g. XDR, ASN.1, SMB, AFP etc
5	Session	e.g. TLS, SSH, ISO 8327 / CCITT X.225, RPC, NetBIOS, ASP etc.
4	Transport	e.g. TCP, UDP, RTP, SCTP, SPX, ATP etc.
3	Network	e.g. IP/IPv6, ICMP, IGMP, X.25, CLNP, ARP, RARP, BGP, OSPF, RIP, IPX, DDP etc
2	Data Link	e.g. Ethernet, Token ring, PPP, HDLC, Frame relay, ISDN, ATM, 802.11 Wi-Fi, FDDI etc
1	Physical	e.g. wire, radio, fiber optic etc.

TCP Performance measurement

network debugging	Network driver Notes
Linux Kernel Networking	Linux Kernel Network Data Flow	Writing Netfilter modules
Dev Rx Flow	Dev Tx Flow	Device Layer.ppt
Network Advanced Socket Example