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System Administration Guide: IP Services     Oracle Solaris 10 8/11 Information Library
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Part I Introducing System Administration: IP Services

1.  Oracle Solaris TCP/IP Protocol Suite (Overview)

What's New in This Release

Introducing the TCP/IP Protocol Suite

Protocol Layers and the Open Systems Interconnection Model

OSI Reference Model

TCP/IP Protocol Architecture Model

Physical Network Layer

Data-Link Layer

Internet Layer

Transport Layer

Application Layer

How the TCP/IP Protocols Handle Data Communications

Data Encapsulation and the TCP/IP Protocol Stack

Application Layer: Where a Communication Originates

Transport Layer: Where Data Encapsulation Begins

Internet Layer: Where Packets Are Prepared for Delivery

Data-Link Layer: Where Framing Takes Place

Physical Network Layer: Where Frames Are Sent and Received

How the Receiving Host Handles the Packet

TCP/IP Internal Trace Support

Finding Out More About TCP/IP and the Internet

Computer Books About TCP/IP

TCP/IP and Networking Related Web Sites

Requests for Comments and Internet Drafts

Part II TCP/IP Administration

2.  Planning Your TCP/IP Network (Tasks)

3.  Introducing IPv6 (Overview)

4.  Planning an IPv6 Network (Tasks)

5.  Configuring TCP/IP Network Services and IPv4 Addressing (Tasks)

6.  Administering Network Interfaces (Tasks)

7.  Configuring an IPv6 Network (Tasks)

8.  Administering a TCP/IP Network (Tasks)

9.  Troubleshooting Network Problems (Tasks)

10.  TCP/IP and IPv4 in Depth (Reference)

11.  IPv6 in Depth (Reference)


12.  About DHCP (Overview)

13.  Planning for DHCP Service (Tasks)

14.  Configuring the DHCP Service (Tasks)

15.  Administering DHCP (Tasks)

16.  Configuring and Administering the DHCP Client

17.  Troubleshooting DHCP (Reference)

18.  DHCP Commands and Files (Reference)

Part IV IP Security

19.  IP Security Architecture (Overview)

20.  Configuring IPsec (Tasks)

21.  IP Security Architecture (Reference)

22.  Internet Key Exchange (Overview)

23.  Configuring IKE (Tasks)

24.  Internet Key Exchange (Reference)

25.  IP Filter in Oracle Solaris (Overview)

26.  IP Filter (Tasks)

Part V Mobile IP

27.  Mobile IP (Overview)

28.  Administering Mobile IP (Tasks)

29.  Mobile IP Files and Commands (Reference)


30.  Introducing IPMP (Overview)

31.  Administering IPMP (Tasks)

Part VII IP Quality of Service (IPQoS)

32.  Introducing IPQoS (Overview)

33.  Planning for an IPQoS-Enabled Network (Tasks)

34.  Creating the IPQoS Configuration File (Tasks)

35.  Starting and Maintaining IPQoS (Tasks)

36.  Using Flow Accounting and Statistics Gathering (Tasks)

37.  IPQoS in Detail (Reference)



Introducing the TCP/IP Protocol Suite

This section presents an in-depth introduction to the protocols that are included in TCP/IP. Although the information is conceptual, you should learn the names of the protocols. You should also learn what each protocol does.

“TCP/IP” is the acronym that is commonly used for the set of network protocols that compose the Internet Protocol suite. Many texts use the term “Internet” to describe both the protocol suite and the global wide area network. In this book, “TCP/IP” refers specifically to the Internet protocol suite. “Internet” refers to the wide area network and the bodies that govern the Internet.

To interconnect your TCP/IP network with other networks, you must obtain a unique IP address for your network. At the time of this writing, you obtain this address from an Internet service provider (ISP).

If hosts on your network are to participate in the Internet Domain Name System (DNS), you must obtain and register a unique domain name. The InterNIC coordinates the registration of domain names through a group of worldwide registries. For more information on DNS, refer to System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP).

Protocol Layers and the Open Systems Interconnection Model

Most network protocol suites are structured as a series of layers, sometimes collectively referred to as a protocol stack. Each layer is designed for a specific purpose. Each layer exists on both the sending and receiving systems. A specific layer on one system sends or receives exactly the same object that another system's peer process sends or receives. These activities occur independently from activities in layers above or below the layer under consideration. In essence, each layer on a system acts independently of other layers on the same system. Each layer acts in parallel with the same layer on other systems.

OSI Reference Model

Most network protocol suites are structured in layers. The International Organization for Standardization (ISO) designed the Open Systems Interconnection (OSI) Reference Model that uses structured layers. The OSI model describes a structure with seven layers for network activities. One or more protocols is associated with each layer. The layers represent data transfer operations that are common to all types of data transfers among cooperating networks.

The OSI model lists the protocol layers from the top (layer 7) to the bottom (layer 1). The following table shows the model.

Table 1-1 Open Systems Interconnection Reference Model

Layer No.
Layer Name
Consists of standard communication services and applications that everyone can use.
Ensures that information is delivered to the receiving system in a form that the system can understand.
Manages the connections and terminations between cooperating systems.
Manages the transfer of data. Also assures that the received data are identical to the transmitted data.
Manages data addressing and delivery between networks.
Data link
Handles the transfer of data across the network media.
Defines the characteristics of the network hardware.

The OSI model defines conceptual operations that are not unique to any particular network protocol suite. For example, the OSI network protocol suite implements all seven layers of the OSI model. TCP/IP uses some of OSI model layers. TCP/IP also combines other layers. Other network protocols, such as SNA, add an eighth layer.

TCP/IP Protocol Architecture Model

The OSI model describes idealized network communications with a family of protocols. TCP/IP does not directly correspond to this model. TCP/IP either combines several OSI layers into a single layer, or does not use certain layers at all. The following table shows the layers of the Oracle Solaris implementation of TCP/IP. The table lists the layers from the topmost layer (application) to the bottommost layer (physical network).

Table 1-2 TCP/IP Protocol Stack

OSI Ref. Layer No.
OSI Layer Equivalent
TCP/IP Layer
TCP/IP Protocol Examples
Application, session, presentation
NFS, NIS, DNS, LDAP, telnet, ftp, rlogin, rsh, rcp, RIP, RDISC, SNMP, and others
Data link
Data link
PPP, IEEE 802.2
Physical network
Ethernet (IEEE 802.3), Token Ring, RS-232, FDDI, and others

The table shows the TCP/IP protocol layers and the OSI model equivalents. Also shown are examples of the protocols that are available at each level of the TCP/IP protocol stack. Each system that is involved in a communication transaction runs a unique implementation of the protocol stack.

Physical Network Layer

The physical network layer specifies the characteristics of the hardware to be used for the network. For example, physical network layer specifies the physical characteristics of the communications media. The physical layer of TCP/IP describes hardware standards such as IEEE 802.3, the specification for Ethernet network media, and RS-232, the specification for standard pin connectors.

Data-Link Layer

The data-link layer identifies the network protocol type of the packet, in this instance TCP/IP. The data-link layer also provides error control and “framing.” Examples of data-link layer protocols are Ethernet IEEE 802.2 framing and Point-to-Point Protocol (PPP) framing.

Internet Layer

The Internet layer, also known as the network layer or IP layer, accepts and delivers packets for the network. This layer includes the powerful Internet Protocol (IP), the Address Resolution Protocol (ARP), and the Internet Control Message Protocol (ICMP).

IP Protocol

The IP protocol and its associated routing protocols are possibly the most significant of the entire TCP/IP suite. IP is responsible for the following:

Oracle Solaris supports both IPv4 and IPv6 addressing formats, which are described in this book. To avoid confusion when addressing the Internet Protocol, one of the following conventions is used:

ARP Protocol

The Address Resolution Protocol (ARP) conceptually exists between the data-link and Internet layers. ARP assists IP in directing datagrams to the appropriate receiving system by mapping Ethernet addresses (48 bits long) to known IP addresses (32 bits long).

ICMP Protocol

The Internet Control Message Protocol (ICMP) detects and reports network error conditions. ICMP reports on the following:

Chapter 8, Administering a TCP/IP Network (Tasks) contains more information on Oracle Solaris commands that use ICMP for error detection.

Transport Layer

The TCP/IP transport layer ensures that packets arrive in sequence and without error, by swapping acknowledgments of data reception, and retransmitting lost packets. This type of communication is known as end-to-end. Transport layer protocols at this level are Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Stream Control Transmission Protocol (SCTP). TCP and SCTP provide reliable, end-to-end service. UDP provides unreliable datagram service.

TCP Protocol

TCP enables applications to communicate with each other as though they were connected by a physical circuit. TCP sends data in a form that appears to be transmitted in a character-by-character fashion, rather than as discrete packets. This transmission consists of the following:

TCP attaches a header onto the transmitted data. This header contains many parameters that help processes on the sending system connect to peer processes on the receiving system.

TCP confirms that a packet has reached its destination by establishing an end-to-end connection between sending and receiving hosts. TCP is therefore considered a “reliable, connection-oriented” protocol.

SCTP Protocol

SCTP is a reliable, connection-oriented transport layer protocol that provides the same services to applications that are available from TCP. Moreover, SCTP can support connections between systems that have more than one address, or multihomed. The SCTP connection between sending and receiving system is called an association. Data in the association is organized in chunks. Because SCTP supports multihoming, certain applications, particularly applications used by the telecommunications industry, need to run over SCTP, rather than TCP.

UDP Protocol

UDP provides datagram delivery service. UDP does not verify connections between receiving and sending hosts. Because UDP eliminates the processes of establishing and verifying connections, applications that send small amounts of data use UDP.

Application Layer

The application layer defines standard Internet services and network applications that anyone can use. These services work with the transport layer to send and receive data. Many application layer protocols exist. The following list shows examples of application layer protocols:

Standard TCP/IP Services
UNIX “r” Commands

The UNIX “r” commands enable users to issue commands on their local machines that run on the remote host. These commands include the following:

Instructions for using these commands are in the rcp(1), rlogin(1), and rsh(1) man pages.

Name Services

Oracle Solaris provides the following name services:

Directory Service

Oracle Solaris supports LDAP (Lightweight Directory Access Protocol) in conjunction with the Sun Open Net Environment (Sun ONE) Directory Server, as well as other LDAP directory servers. The distinction between a name service and a directory service is in the differing extent of functionality. A directory service provides the same functionality of a naming service, but provides additional functionalities as well. See System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP).

File Services

The NFS application layer protocol provides file services for Oracle Solaris. You can find complete information about the NFS service in System Administration Guide: Network Services.

Network Administration

The Simple Network Management Protocol (SNMP) enables you to view the layout of your network and the status of key machines. SNMP also enables you to obtain complex network statistics from software that is based on a graphical user interface (GUI). Many companies offer network management packages that implement SNMP.

Routing Protocols

The Routing Information Protocol (RIP) and the Router Discovery Server Protocol (RDISC) are two available routing protocols for TCP/IP networks. For complete lists of available routing protocols for Oracle Solaris 10, refer to Table 5-1 and Table 5-2.