Network Setup in RHCE6

8/12/2019 Network Setup in RHCE6

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Network setup in RHCE6

In this article we would setup a test network for RHCE exam practice. RHCE is a practical base exam. Ideally you

can set up as much as systems you need, for example you can set up a dedicated web server, a dedicate DHCP

server, a dedicate DNS server, a dedicate client for testing of each service.

However that is not practical required. You can complete all exercises with four systems. You can use four physical

systems or can use virtual machines.

server.example.com 192.168.1.1 255.255.255.0

linuxclient.example.com 192.168.1.10 255.255.255.0

windowclient.example.com 192.168.1.20 255.255.255.0

outsider.example.org 192.168.0.100 255.255.255.0

Configure IP address and Hostname

Configure portmap daemon Configure xinetd service

Configure IP address and hostname

IP address is the unique address of computer in network. Computer use IP address to communicate with other

computers of the network. Assign above IP addresses to the associated computers.

Configure xinetd daemon
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xinetd, the eXtended InterNET Daemon, is an open-source daemon. xinetddaemon provide access control for all

the services based on the address of the remote host. It allows you to bind the specific services to the specific IP

address of host system. xinetddaemon process listens on all service ports for the services listed in its configuration

file. When a request comes in, xinetdstarts the appropriate server. Each service has its own specific configuration

file for Xinetd. These files are located in the/etc/xi netd.ddirectory.

Configure portmap service

portmapservice is required to map RPC(Remote Procedure Calls) requests to the correct services. In exam you

have to configure services like NFSthat rely on RPC. NFSuses RPCto route requests between clients and servers.

portmapservice must be enabled and active at the proper runlevels for NFScommunication to happen. portmap

service uses TCP wrappers' hosts access files (/etc/hosts.al lowand/etc/hosts.deny) for access control.

You will not find portmapservice in RHEL 6. You will return with following error

portmap: unrecognized service

To support IPv6 portmapservice is replaced by rpcbindin RHEL6. Use rpcbindinstead of portmap.

server.example.com

This is designated system for server. We will use static IP address for server. Server related services will be

configured on this system. Configure IP address

Run system-config-networkcommand

Select Device configurationand press enter

Select the appropriate network adaptor. In real life you may see multiple network adaptors but in exam you will get

only one network adaptor unless you have configured additional adaptor.


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Fill the IP address which we have set for this system in above table and select OKand press enter

Select saveand press enter

Select Save & Quitand press enter to return to command prompt


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Restart the network adaptor to take the change in effect

We have assigned IP address. Now open /etc/sysconfig-networkfile to set hostname

Set NETWORKINGto yesand HOSTNAMEto serverand save file.

Restart the system to take the hostname change in effect

Check updated hostname


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We have updated hostname. Now it's time to configure portmapdaemon. As I have said previouslythat portmapisreplaced with rpcbind.

rpcbind-0.2.0-8.el6.x86_64package is required for rpcbinddaemon. Install package if it is not installed.

check rpcbindservice is on in runlevel 3 and runlevel 5. on it if it is set to off.

check rpcbindservice status. start if it is stop.

Now configure the xinetdservice. xinetd-2.3.14-31.el6.x86_64RPM is required for xinetdservice. Install it if it is

not available

check xinetdservice is on in runlevel 3 and runlevel 5. on it if it is set to off


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check service status, start it if it is stopped

We have configured serversystem for networking.

linuxclient.example.com

This system will be used to verify the configuration on the server.example.comsystem.

For example if we have configured DHCP server we should be able to receive dynamic IP address on

linuxclient.example.comsystem.

configuration for this system is same as we did for server.example.comsystem except the IP address and hostname.


Press enter on Device configuration

select network adaptor


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Assign the IP address and return back to command prompt

Restart the network adaptor to take the new IP address in effect

Open hostname configuration file

Change HOSTNAMEto linuxclientand save the file


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restart the system

check updated hostname

Check rpcbindrpm and service

Check xinetdrpm and service

When you finished with configuration check connectivity with server.example.com


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outsider.example.org

outsider system is essentially a random system from an external network . During the exam you need to configure

security on server. Appropriate security settings means that some services on server.example.commachine would

not be accessible to outsider system.

configuration for this system is same as we did for server.example.comsystem except the IP address and hostname.


Select Device configurationand press enter

select network adaptor


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Assign the IP address and return back to command prompt

Restart the network adaptor to take the new IP address in effect

#ifdown eth1

#ifup eth1

Open hostname configuration file

Change HOSTNAMEto outsiderand save the file

restart the system and check the updated hostname


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Check rpcbindrpm and service

Check xinetdrpm and service

windowclient.example.com

Finally we will configure a window client for our network. Although it is not required to configure window client

but if you have additional system you should. It would give us additional system for testing.

Click on network icon and Click on open network sharing and center


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click onchange adaptor setting

select the network adaptor and do right click. click on propertiesfrom opened dialog box

select Internet protocol version (TCP/IPv4)and click on properties


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set the IP address and click on apply

To change computer name click on stat, right click on computerand click on properties

click on change setting

click on change


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assign new name windowclinetand change workgroup to MSHOME

restart is required. Click on ok to restart the computer

After restart open command prompt and check IP address and hostname


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check connectivity with server.example.com

In this article we have setup network for RHCE practice in LAB environment. To setup this lab on Vmware watch

following video.

Network Setup in RHCE6

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Transcript of Network Setup in RHCE6