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HP-UX LAN Administrator's Guide: HP-UX 11i v2 > Chapter 6  Network Addressing

Network Addresses and Node Names

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Several types of names and addresses are used in networking software. This can be confusing to first-time users. Table 6-2 “Network Addresses and the OSI Model” illustrates which address type is used by each layer of the OSI model. A description of each address type and how it is used by LAN and the services which run on it follows inTable 6-3 “Network Address Types, Descriptions, and Examples”. Refer to “Network and System Names” for additional information on how these names are assigned.

Table 6-2 Network Addresses and the OSI Model

OSI Layer Name

OSI Layer Function

Address Type Used

7

Application

network programs

hostname

6

Presentation

data interpretation

hostname

5

Session

connection control

socket address

4

Transport

end-to-end transfer

port address

3

Network

routing and switching

Internet (IP) address

2

Data Link

data packaging and error detection

link level address

1

Physical

physical connection

link level address

 

Table 6-3 Network Address Types, Descriptions, and Examples

Address Type

Description

Recorded In

Used By

link level address

Also referred to as MAC address or station address.

A link level address is the unique address of the LAN interface card. This value can be configured in SAM and lanadmin.

An example of a link level address in hexadecimal: 0800090012AB.

Interface card; can be changed in /etc/rc.config.d/hpbtlanconf file. Refer toTable 3-2 “Fast Ethernet Examples” for sample filenames.

linkloop diagnostic; internals of networking software to uniquely identify nodes on the LAN; displayed by lanadmin and lanscan diagnostics.

internet (IP) address

Also referred to as IP address.

An internet address is the network address of a computer node. This address identifies which network the host is on (see network address description below) and which host it is (see host address description below).

An example of an internet address: 192.6.23.3

/etc/hosts;
/etc/rc.config.d/netconf
.

Typically used in combination with the network address to form an internet address.

HP-UX ifconfig command.

network address

Also, network number.

The network address is the network portion of an internet address that represents the local network on which a host exists. The network address is the same for all nodes on that network. Refer to “Internet Addresses” in this chapter for a definition of Internet address classes.

If the IP address is 192.6.23.3 (Class C), and the subnet address is 255.255.255.0, then the network address portion is 192.6.23.

/etc/networks.

Combined with host address in /etc/hosts.

Routing facility. Displayed by:

netstat -in, netstat -rn, and netstat -rnv.

HP-UX ifconfig command.

host address

Also, host number.

The host address is that portion of the internet address that is unique to the network. The host address identifies a particular node on the network. Refer to “Internet Addresses” in this chapter for a definition of Internet address classes.

If the IP address is 192.6.23.3 (Class C), and subnet address is 255.255.255.0, then the host address portion is 3.

Combined with network address in /etc/hosts.

Typically used in combination with the network address to form an internet address.

HP-UX ifconfig command.

port address

Also referred to as TCP port number, UDP port number, or simply port.

A port address is an address within a host that is used to differentiate between multiple communication endpoints with the same internet address and protocol. A port address is associated with a particular service. Well known port numbers are defined by RFC 923, “Assigned Numbers.”

For example, if your local address is listed as 192.6.23.3.1023, then .1023 is the port address.

/etc/services.

Service requests. Displayed by netstat -an.

socket address

A socket address is declared in processes defined by the interprocess communication software. Refer to Using Internet Services for more information on interprocess communication. Refer to the sockaddr struct in the BSD Sockets Interface Programmer's Guide for examples.

Socket address variables.

Interprocess communication.

system name

Also referred to as the system host name and system node name.

This is the name your HP-UX system is known by and is assigned using the HP-UX uname command.

An example of a system name is: host3. Assigned automatically by the system.

/etc/rc.config.d/netconf (as HOSTNAME variable).

uucp facilities.

host name node name

Also known as the Internet host name and NFS host name.

A symbolic name associated with an internet address by which a node can be uniquely identified.

An example of a host name is: host3. Assigned by using the hostname command.

/etc/hosts ;
/etc/hosts.equiv
(optional);
$HOME/.rhosts (optional) ;
$HOME/.netrc
(optional) ;
/usr/adm/inetd.sec
(optional) .

All Internet Services.

 

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