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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.
Run system-config-networkcommand
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.
Run system-config-networkcommand
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.