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Understanding UNIX TCP/IP network configuration and administration is important in this context because it is used as the transport for Samba NetBIOS services. NetBIOS over TCP/IP (NetBT) is defined in RFCs 1001 and 1002. We will take a closer look at NetBT in the Windows networking section of the following chapter.
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When we talk about TCP/IP we are referring to a larger set of protocols that comprise the general functionality associated with service (Table 2.2). In the TCP/IP stack model, these protocols are bundled into a smaller number of layers than defined in the OSI model.
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Table 2.2 Common Lower-Layer Internet Protocols
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IP ICMP ARP RARP TCP UDP
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Internet Protocol Internet Control Message Protocol Address Resolution Protocol Reverse Address Resolution Protocol Transmission Control Protocol User Datagram Protocol
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Figure 2.2: TCP/IP and OSI stack
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The Physical layer represents a conglomeration of hardware interfaces and protocols that interoperate via the conduit defined in the upper layers. These interfaces employ a wide range of data speeds and physical architectures. The Internetwork layer combines the OSI data-link layer and a portion of the OSI network layer. The layer is comprised of two protocols, Internet Protocol (IP) and Internet Control Message Protocol (ICMP). IP and ICMP are connectionless protocols that provide the basic data buckets and control in the network. The Transport layer defines two protocols, Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). TCP ensures a reliable ordered transport whereas UDP service is unreliable and does not ensure delivery.
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The Application layer in the TCP/IP suite, like the OSI model, implements the user interface. Client/server protocols are most often defined at the application layer.
Addressing
A unique IP address is assigned by the network administrator to represent each computer in the network. The IP address abstracts the hardware address to a more general use. At this address level we are not concerned with the adapter interface type used on a particular machine. Each IP address is a 32-bit number represented as four octets. Each octet is a number in the range of 0 through 255: <0-255>.<0-255>.<0-255>.<0-255> In large networks, it is often desirable to group and partition computers to localize traffic patterns, hide internal network structure, simplify information routing, and enforce security policy. This is done using a system called subnets. A subnet mask is used to mask out a portion of the IP address to determine how traffic from the particular computer will be routed to other computers in the network. When a machine within the organization wants to send a packet to another system, it applies the subnet mask to the destination address to see if the address is on the local network or if it must send it to a router for delivery. The subnet mask is a four-octet number that indicates which bits in the address are to be masked as the network and subnet portion of the address. The low-order bits of the mask designate the host portion of the address. netmask 0xfffffff0 14 hosts per subnet (0 and 15 excluded) netmask 0xfffffff8 6 hosts per subnet (0 and 7 excluded) Understanding the subnet structure of the network will be important when you begin defining resources to be shared between systems which may exist on different subnets.
Domain Name Service
Although IP addresses uniquely identify computers and associated resources on the network, they are not easily remembered by human beings when trying to find those computers and resources. The simple solution to this kind of brain fault is to map easily remembered text strings to the associated IP numbers. A table of machine names and IP addresses can be installed on each computer to act as a directory of known systems. Under UNIX this directory of host name and IP number pairs is called the /etc/hosts table (Example 2.2). Host tables work well for small networks but immediately break down as we scale up to large numbers of systems. Mapping host names to IP numbers for a large set of networks like the Internet is subject to the same scaling problems encountered when mapping personal and business names to phone numbers for all the cities in a particular country. There are far too many name collisions and the phone book is too large for timely incorporation and distribution of updates. Example 2.2 /etc/hosts # # IP Number
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