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How to set up a dhcp server on Ubuntu Server 12.10


Today I will show you how to set up and configure a dhcp server on Ubuntu Server 12.10.

If you have not already installed the required packages when installing Ubuntu then you will need to install isc-dhcp-server.  At your command prompt type:

sudo apt-get install isc-dhcp-server

As far as configuration goes there are two main files, these being /etc/default/isc-dhcp-server and /etc/dhcp/dhcpd.conf.  At your command prompt type:

sudo nano /etc/default/isc-dhcp-server

I am using nano but you can use whichever text editor takes your fancy.

Locate the line INTERFACES=”” and replace with INTERFACES=”eth0” where eth0 is the name of the network interface you want the server to lease addresses on.

Save the file and exit.

Now at your prompt type:

sudo nano /etc/dhcp/dhcpd.conf again using your favourite text editor instead of nano.

Add the following two sections of text into the file:

——————————————————————————————————————————–

option domain-name “comtech.com”;

default-lease-time 600;

max-lease-time 7200;

——————————————————————————————————————————–

and

——————————————————————————————————————————–

subnet 10.0.0.0 netmask 255.255.255.0 {
range 10.0.0.150 10.0.0.253;
option routers 10.0.0.2;
option subnet-mask 255.255.255.0;

option broadcast-address 10.0.0.254;
option domain-name-servers 10.0.0.1, 10.0.0.2;

option ntp-servers 10.0.0.1;
option netbios-name-servers 10.0.0.1;
option netbios-node-type 8;
}

——————————————————————————————————————————–

I will need to explain some of the items you have entered.

The option domain-name parameter is your dns zone name.  For example I have set mine to “comtech.com”

Range should be the range of ip addresses that you want the server to give out to clients.

Now we need to restart the dhcp service so at your command prompt type:

sudo service isc-dhcp-server restart

If you get an error stating the job failed to start go back and check the configuration files as you will have entered something incorrectly.  Pay particular attention to the ”” comments when specifying your network interface.  If your service started ok then your server is configured correctly.

It is always best to double check so at your prompt type:

sudo netstat -uap

and locate dhcpd as this will show that the dhcpd deamon is working.

About the Author

Hi I am Chris Wakefield the owner of ComTech IT Support. I provide Windows and Linux based IT Support, laptop repairs and computer repairs to both business and personal clients in and around Stirling.

For a list of what I can offer you why not visit my website www.comtech247.net where you will find a list of my services, testimonials, blog and much more.

 

How to set up a DHCP server on Debian 6.0 “Squeeze”

Today I will show you how to set up a DHCP server on Debian 6.0.  The main package you will need is called isc-dhcp-server which is not installed by default so open up a terminal and type:

sudo apt-get install isc-dhcp-server

There are two main files we will need to configure, these being /etc/default/isc-dhcp-server and /etc/dhcp/dhcpd.conf.

Lets take /etc/default/isc-dhcp-server first.  Open up a terminal and using your favourite text editor type:

sudo nano /etc/default/isc-dhcp-server

You should get the following:

———————————————————————————————–

# Defaults for dhcp initscript
# sourced by /etc/init.d/dhcp
# installed at /etc/default/isc-dhcp-server by the maintainer scripts

#
# This is a POSIX shell fragment
#

# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
# Separate multiple interfaces with spaces, e.g. “eth0 eth1?.
INTERFACES=”eth0″

————————————————————————————————–

Replace eth0 above with the name of your network interface that you want the server to lease addresses on.  Save the file and exit.


Now lets take the /etc/dhcp/dhcpd.conf file next.  Open up a terminal and type:

sudo nano /etc/dhcp/dhcpd.conf

which should give you the output below.

————————————————————————————————-

#
# Sample configuration file for ISC dhcpd for Debian
#
# Attention: If /etc/ltsp/dhcpd.conf exists, that will be used as
# configuration file instead of this file.
#
#

# The ddns-updates-style parameter controls whether or not the server will
# attempt to do a DNS update when a lease is confirmed. We default to the
# behavior of the version 2 packages (‘none’, since DHCP v2 didn’t
# have support for DDNS.)
ddns-update-style none;

# option definitions common to all supported networks…
option domain-name “example.org”;
option domain-name-servers ns1.example.org, ns2.example.org;

option domain-name “comtech.com”;
default-lease-time 600;
max-lease-time 7200;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps the
# DHCP server to understand the network topology.

#subnet 10.152.187.0 netmask 255.255.255.0 {
#}

# This is a very basic subnet declaration.

subnet 10.0.0.0 netmask 255.255.255.0 {
range 10.0.0.150 10.0.0.253;
option routers 10.0.0.2;
option subnet-mask 255.255.255.0;

option broadcast-address 10.0.0.254;
option domain-name-servers 10.0.0.1, 10.0.0.2;

option ntp-servers 10.0.0.1;
option netbios-name-servers 10.0.0.1;
option netbios-node-type 8;
}

# option routers rtr-239-0-1.example.org, rtr-239-0-2.example.org;

#}

# This declaration allows BOOTP clients to get dynamic addresses,
# which we don’t really recommend.

#subnet 10.254.239.32 netmask 255.255.255.224 {
# range dynamic-bootp 10.254.239.40 10.254.239.60;
# option broadcast-address 10.254.239.31;
# option routers rtr-239-32-1.example.org;
#}

# A slightly different configuration for an internal subnet.
#subnet 10.5.5.0 netmask 255.255.255.224 {
# range 10.5.5.26 10.5.5.30;
# option domain-name-servers ns1.internal.example.org;
# option domain-name “internal.example.org”;
# option routers 10.5.5.1;
# option broadcast-address 10.5.5.31;
# default-lease-time 600;
# max-lease-time 7200;
#}

# Hosts which require special configuration options can be listed in
# host statements. If no address is specified, the address will be
# allocated dynamically (if possible), but the host-specific information
# will still come from the host declaration.

#host passacaglia {
# hardware ethernet 0:0:c0:5d:bd:95;
# filename “vmunix.passacaglia”;
# server-name “toccata.fugue.com”;
#}

# Fixed IP addresses can also be specified for hosts. These addresses
# should not also be listed as being available for dynamic assignment.
# Hosts for which fixed IP addresses have been specified can boot using
# BOOTP or DHCP. Hosts for which no fixed address is specified can only
# be booted with DHCP, unless there is an address range on the subnet
# to which a BOOTP client is connected which has the dynamic-bootp flag
# set.
#host fantasia {
# hardware ethernet 08:00:07:26:c0:a5;
# fixed-address fantasia.fugue.com;
#}

# You can declare a class of clients and then do address allocation
# based on that. The example below shows a case where all clients
# in a certain class get addresses on the 10.17.224/24 subnet, and all
# other clients get addresses on the 10.0.29/24 subnet.

#class “foo” {
# match if substring (option vendor-class-identifier, 0, 4) = “SUNW”;
#}

#shared-network 224-29 {
# subnet 10.17.224.0 netmask 255.255.255.0 {
# option routers rtr-224.example.org;
# }
# subnet 10.0.29.0 netmask 255.255.255.0 {
# option routers rtr-29.example.org;
# }
# pool {
# allow members of “foo”;
# range 10.17.224.10 10.17.224.250;
# }
# pool {
# deny members of “foo”;
# range 10.0.29.10 10.0.29.230;
# }
#}

————————————————————————————————

This needs a little bit of explaining.

1. Everything in bold needs adding to the file.  Adjust the network settings according to your network requirements.

2. The option domain name is your dns zone name.  For example mine is set to comtech.com.

3. Range should be the range of ip addresses that you want the server to give out to clients.

Now restart the dhcp service by typing:

sudo service isc-dhcp-server restart

That is your server configured however it is always best to double check so open up a terminal and type:

sudo netstat -uap

This should show you the following information (please be aware that your system might be slightly different).

————————————————————————————————

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

udp 0 0 *:55827 *:* 916/avahi-daemon: r
udp 0 0 server01.lo:domain *:* 1273/named
udp 0 0 server01:domain *:* 1273/named
udp 0 0 *:bootps *:* 4525/dhcpd
udp 0 0 *:17500 *:* 1768/dropbox
udp 0 0 *:54407 *:* 4539/VirtualBox
udp 0 0 10.0.0.255:netbios-ns *:* 1016/nmbd
udp 0 0 server01:netbios-ns *:* 1016/nmbd
udp 0 0 *:netbios-ns *:* 1016/nmbd
udp 0 0 10.0.0.255:netbios-dgm *:* 1016/nmbd
udp 0 0 server01:netbios-dgm *:* 1016/nmbd
udp 0 0 *:netbios-dgm *:* 1016/nmbd
udp 0 0 *:mdns *:* 916/avahi-daemon: r
udp6 0 0 [::]:domain [::]:* 1273/named
udp6 0 0 [::]:51853 [::]:* 916/avahi-daemon: r
udp6 0 0 [::]:mdns [::]:* 916/avahi-daemon: r

————————————————————————————————

This shows that the dhcp service is working

About the Author

Hi I am Chris Wakefield the owner of ComTech IT Support. I provide Windows and Linux based IT Support, laptop repairs and computer repairs to both business and personal clients in and around Stirling.

For a list of what I can offer you why not visit my website www.comtech247.net where you will find a list of my services, testimonials, blog and much more.

How to set up a DHCP server on Windows Server 2008 R2


Today I will show you how to set up a DHCP server on Windows Server 2008 R2.

Open up Server Manager, right click on Roles and click Add Roles.

When you are shown a list of available roles click DHCP Server and then Next.  On the following screen read the information and then click next.

On the next screen you will be asked to choose your network adapter.  When chosen click Next.

You will now be asked to specify the domain that the DHCP Server will be operating in and the location of the DNS Servers.  Fill in the required fields and click Next.

You will now be asked to specify if WINS is required or not.  If WINS is required then fill in the required details.  If not just click Next.

We now have to specify an address scope for the DHCP Server. Click Add and then fill in the appropriate fields as shown below in the screenshot.

Now we need to configure DHCPv6 Stateless Mode.  If you are unsure of the settings then use the default, otherwise enter your configuration and click Next.

We now move on to Specifying IPv6 DNS Server Settings. Your primary DNS Server usually takes this role so unless you have specific requirements I would suggest using its settings for this section.

Next we need to Authorize the DHCP Server. Enter the credentials of a user who is part of the Domain Admins group and click Next.

Now on the final screen review your configuration and when happy click Install.

And that is it.  You now have a fully functional DHCP Server on your domain.

About the Author

Hi I am Chris the owner of ComTech. I provide IT Support, Laptop repairs and Computer repairs to both personal and business clients in and around Stirling. For a list of what I can offer you why not visit my website www.comtech247.net where you will find my blog, testimonials, services and much more.  Start supporting a local business today so I can start supporting you.

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