Network Administration for the Solaris 9 Operating Environment SA-399 Student Guide phần 8 ppsx

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Configuring a DHCP Server

The DHCP Configuration Wizard – Step 2 window appears

Figure 11-8 shows you where to enter a path for the data store Thisexample uses the default directory

Figure 11-8 DHCP Configuration Wizard – Step 2 Window

4 Accept the default path name, and click >

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11-20 Network Administration for the Solaris™ 9 Operating Environment

Figure 11-9 allows you to specify the name service in which to storehost records

Figure 11-9 DHCP Configuration Wizard – Step 3 Window

5 Select/etc/hosts, and click >

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Figure 11-10 shows you where to specify the length of the lease Thisexample uses the defaults 1 and days

Figure 11-10 DHCP Configuration Wizard – Step 4 Window

6 Accept the defaults of 1 and days, and click >

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Figure 11-11 shows you where to specify the DNS domain and DNSservers This example uses the default of no DNS

7 Do not accept a DNS domain or DNS server, and click >

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Figure 11-12 shows you where to specify the network address and asubnet mask This example uses the192.168.1.0network

8 Specify a network address by either selecting one or typing one, type

a subnet mask, and click >

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Figure 11-13 shows you where to specify information about thenetwork This example uses the defaults Local-Area (LAN) and Userouter discovery protocol

9 Select either Local-Area (LAN) or Point-to-Point

10 Select either Use router discovery protocol or type the routerinformation in the Use router field

11 Click >

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Figure 11-14 shows you where to specify the NIS domain and

servers This example uses the defaults of no NIS domain and noNIS server

12 If appropriate, type the NIS domain configuration in the NIS Domainfield

13 If appropriate, type the NIS server IP address in the NIS Serversfield, and click Add for each NIS server that you are specifying

14 Click >

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Figure 11-15 shows you where to specify the NIS+ domain andservers This example uses the defaults of no NIS+ domain and noNIS+ server

15 If appropriate, type the NIS+ domain configuration in the NIS+Domain field

16 If appropriate, type the NIS+ server IP address in the NIS+ Serversfield, and click Add for each NIS+ server that you are specifying

17 Click >

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Figure 11-16 shows you a summary of the information you enteredpreviously This example uses the sample information indicatedpreviously

18 Review the information and, if the information is correct, clickFinish

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The DHCP Configuration Manager Window closes, the main DHCPManager Window appears, and the window in Figure 11-17 appears.Figure 11-17 shows you where to indicate that you want to configureaddresses for the server

Figure 11-17 Start Address Wizard Window

19 Click Yes to proceed with address configuration

The dhcp_networkfile is now populated

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Adding Addresses by Using the dhcpmgr Utility

Note – The following steps are a continuation of initial server

configuration

The DHCP Address Configuration Wizard – Step 1 window appears.Figure 11-18 shows you where to specify the number of IP addresses toconfigure This example uses five addresses and a comment of net1

Figure 11-18 DHCP Address Configuration Wizard – Step 1

Window

1 Modify the number of IP addresses to use

2 Add a comment if necessary

3 Click >

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The DHCP Address Configuration Wizard – Step 2 window appears.Figure 11-19 shows you where to specify the DHCP server andstarting IP address In this example, the Managed by Server field isset at the default, and the starting IP address changes to

192.168.1.10 This example uses sys11-dhcpfor the root name

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The DHCP Address Configuration Wizard – Step 3 window appears.Figure 11-20 shows you the IP addresses that you specified in theprevious step

Window

7 Verify that the address information is correct, and click >

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The DHCP Address Configuration Wizard – Step 4 window appears.Figure 11-21 shows you the name of the macro to be associated withthe DHCP interface

Window

8 Select Configuration Macro from the drop-down list box

If you want to view the contents of the selected macro, click View Toexit the contents window, click OK

9 Click >

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The DHCP Address Configuration Wizard – Step 5 window appears.Figure 11-22 shows you where to specify the type of lease Thisexample uses the default of Dynamic

Window

Note – Routers, mail servers, and systems that provide services normally

use permanent lease types

10 Select either Dynamic or Permanent, and click >

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The DHCP Address Configuration Wizard – Step 6 window appears.Figure 11-23 shows the information that you entered in previoussteps

Window

11 Review the information, and click Finish

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The DHCP Manager Window appears Figure 11-24 shows theinformation that you have provided

Figure 11-24 DHCP Manager Window

12 Choose Exit from the File menu to close the DHCP Managerwindow

13 To view the information that dhcpmgradded to the/etc/inet/hostsfile, use the grepcommand:

sys11# grep dhcp /etc/inet/hosts

192.168.1.10 sys11-dhcp-10 #net1 example

sys11#

Table 11-1 shows the items that are created during DHCP configuration

Table 11-1 Items Created During DHCP Server Configuration

The service configuration

file,

/etc/inet/dhcpsvc.conf

Records keywords andvalues for serverconfiguration options

Data store type andlocation Options used withthein.dhcpd process tostart the DHCP daemonwhen the system boots.Thedhcptab table Creates adhcptabtable if it

does not already exist

Macros and options withassigned values

TheLocale macro

(optional)

Contains the local timezone’s offset in secondsfrom Universal TimeCoordinated (UTC)

TheUTCoffst option

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The server macro, named to

match the server’s node

name

Contains options withvalues determined by inputfrom the administrator whoconfigured the DHCPserver The options apply toall clients that use addressesowned by the server

TheLocale macro Theoptions:Timeserv, which isset to point to the server’sprimary IP address;

LeaseTimandLeaseNeg,ifyou select negotiable leases;andDNSdmainandDNSserv,

if DNS is configured

The network address macro,

whose name is the same as

the network address of the

client’s network

Contains options withvalues determined by inputfrom the administrator whoconfigured the DHCPserver The options apply toall clients that are located onthe network specified by themacro name

The options:SubnetRouter orRDiscvyFBroadcst, if the network is

a LAN, maximum transferunit (MTU);NISdmain andNISservs, if NIS is

configured; andNIS+dom andNIS+serv, ifNIS+ is configured

The network table for the

network

Creates an empty table untilyou create the IP addressesfor the network

None, until you add the IPaddresses

Table 11-1 Items Created During DHCP Server Configuration (Continued)

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Configuring and Managing DHCP ClientsConfiguring and Managing DHCP Clients

Configuring DHCP clients is an easy process Most management isperformed on the DHCP server side

Configuring the DHCP Client

When you install the Solaris 9 OE from the installation CD-ROM, you areprompted to use DHCP to configure network interfaces If you selectyes

in the installation script, the DHCP client software is enabled on yoursystem during Solaris 9 OE installation You do not need to do anythingelse on the Solaris 9 OE client to use DHCP

If your client is not a Solaris 9 OE client, consult the client’sdocumentation for configuration instructions

Configuring the DHCP Client to Request Dynamic Host Names

If a client system is already running the Solaris 9 OE and is not usingDHCP, complete the following steps to configure the DHCP client torequest dynamic host names:

1 Log in asroot on the DHCP client system

2 Enable DHCP on the client by creating the appropriate file for theexternal interface, which ishme0in this example

# touch /etc/dhcp.hme0

Note – You do not need to remove the/etc/hostname.interfacefile

3 Configure the /etc/default/dhcpagentfile on the DHCP client sothat it releases its IP address if it is rebooted or shut down

4 Edit the/etc/default/dhcpagentfile, and remove the#in front oftheRELEASE_ON_SIGTERM=yesparameter This causes the DHCPclient to relinquish its address when it reboots or is shut downproperly

5 Reboot the client, and watch the system console for DHCP messages

as the system boots

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Configuring and Managing DHCP Clients

6 Observe DHCP messages when the Ethernet interface is beingconfigured, for example:

configuring IPv4 interfaces: hme0

starting DHCP on primary interface hme0

Hostname: sys11-dhcp-14

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Exercise: Configuring a DHCP Server and ClientExercise: Configuring a DHCP Server and Client

In this exercise, you configure a basic DHCP server and clientconfiguration

Preparation

Before performing this exercise, you should:

● Refer to your network diagram to determine the function of eachsystem on your subnet

● Refer to the lecture notes as necessary to perform the tasks listed

Note – Use the default configuration parameters in these exercises unless

otherwise specified

Task Summary

In this exercise, you accomplish the following tasks:

● Configure the DHCP server

● Configure the DHCP client

● Use the snooputility to view DHCP client server interaction

Tasks

Perform the following tasks

Task 1 – Configuring the DHCP Server

In this part of the exercise, use the DHCP Manager graphical userinterface (GUI) utility (dhcpmgrutility) to configure a DHCP server onyour subnet Allow the network wizard to start and configure at least fivehosts with the address range starting at 192.168.xxx.xxx, where

xxx.xxxis provided by the instructor depending on the classroom setup

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Exercise: Configuring a DHCP Server and Client

Note – Use the default configuration parameters in this task unless

otherwise specified

This example uses thesys11system to demonstrate configuring a basicDHCP server with thedhcpmgrGUI utility

To configure the DHCP server, complete the following steps:

1 Start thedhcpmgrutility

2 Initially configure the DHCP server

3 Add at least five addresses

4 To view the information that the dhcpmgrutility added to the/etc/inet/hostsfile, use thegrepcommand

Task 2 – Configuring the DHCP Client

To configure the DHCP client, complete the following steps:

1 Log in asrooton the DHCP client

2 Enable DHCP on the client

3 Configure the /etc/default/dhcpagentfile on the DHCP client sothat it releases its IP address if it is rebooted or is shut down

4 Reboot the client, and watch the system console for DHCP messages

as the system boots

5 Observe the DHCP messages when the Ethernet interface is beingconfigured

Task 3 – Using the snoop Utility to View DHCP Client-Server Interaction

An important part of troubleshooting DHCP issues is using the snooputility to observe the network interaction between the server and theclient

To view DHCP client-server interaction, complete the following steps:

1 Start thesnooputility on any system on the subnet other than theDHCP client Be sure to use the snooputility on an interface that is

on the same subnet as the DHCP client, which ishme0in thisexample Have thesnooputility write to the/tmp/dhcp-snoop.snpfile

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Exercise: Configuring a DHCP Server and Client

2 Reboot the DHCP client system

3 After the DHCP client is booted, stop the snooputility by pressingControl-C

4 View the summary of the captured information

5 Use the snooputility to convert the trace data to ASCII text, andoutput that text to the/tmp/dhcp-snoop1.txtfile for viewing withany text editor that allows for easy navigation and searching of thedata

6 Use the viewutility to view the trace data in the

/tmp/dhcp-snoop.txtfile Look out for messages, such as

DHCPDISCOVER,DHCPOFFER,DHCPREQUEST, andDHCPACK, in the trace.Observe the ETHER destination addresses, the source and

destination IP addresses, and the DHCP messages

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Exercise Summary

?

!

Discussion – Take a few minutes to discuss what experiences, issues, or

discoveries you had during the lab exercise

● Experiences

● Interpretations

● Conclusions

● Applications

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Exercise SolutionsExercise Solutions

Perform the following tasks

Task 1 – Configuring the DHCP Server

1 Start thedhcpmgrutility

sys11# /usr/sadm/admin/bin/dhcpmgr &

2 Initially configure the DHCP server

If the system is not configured as a DHCP server or BOOTP relay, Figure 11-25 appears.

Figure 11-25 Choose Server Configuration Window

a Click OK.

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Exercise Solutions

The DHCP Configuration Wizard – Step 1 window in Figure 11-26 appears.

b Select Text files, and click >.

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Exercise Solutions

The DHCP Configuration Wizard – Step 2 window in Figure 11-27 appears This example uses the default directory.

c Accept the default path name, and click >.

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Exercise Solutions

The DHCP Configuration Wizard – Step 3 window in Figure 11-28 appears.

d Select/etc/hosts, and click >.

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Exercise Solutions

The DHCP Configuration Wizard – Step 4 window in Figure 11-29 appears This example uses the defaults 1 and days.

e Accept the defaults of 1 and days, and click >.

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Exercise Solutions

The DHCP Configuration Wizard – Step 5 window in Figure 11-30 appears This example uses the default DNS information.

f Accept the default DNS domain and DNS server, and click OK.

Tiêu đề	Configuring A Dhcp Server
Trường học	Sun Microsystems, Inc.
Chuyên ngành	Network Administration
Thể loại	hướng dẫn
Năm xuất bản	2002
Thành phố	California

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Số trang	60
Dung lượng	547,75 KB