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What is dhcp server - Computers & Internet

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It allows your pc network setting to be configured automatically without you setting it up manually.

Posted on Nov 13, 2010

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Why Addresses in the IP Address Pool on a Switch Are Exhausted When the Switch Functions as a DHCP Server and It Has a Few Clients?


If the IP address pool has much more resources than needs of clients, the following two reasons may cause address exhaustion:
1. An attacker keeps changing the CHADDR field and sending DHCP Discover packets to exhaust addresses. If so, contact Huawei engineers to deploy DHCP snooping to protect the IP address pool.
2. The DHCP server ping function is enabled on the DHCP server. This function tries to ping the allocated addresses before responding to DHCP Offer packets. If a client responds to any ping packet, the DHCP server considers that there are address conflicts and addresses are exhausted. To solve this problem, two methods are available:
1. Capture packets on the ports connected to the DHCP server. If a client responds to ping packets, prohibit the client.
2. Disable the DHCP server ping function using the undo dhcp server ping packet command.
3. Such as S5700, S6700

Aug 01, 2016 | Computers & Internet

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DHCP Server configuration in Linux


Linux is a UNIX based operating system. It is a server operating system. REDHAT Linux is Enterprise version of Linux. Now a day's Most of corporate sectors use red hat Linux as server in their company because it is secure very much.

Full form of DHCP "Dynamic Host Configuration Protocol. DHCP server assigns IP addresses and other network configuration information like subnet mask, broadcast address, etc to computers on a network. The DHCP assignments are the following.

Lease Request: Client broadcasts their request to DHCP server with a source address of 0.0.0.0 and a destination address of 255.255.255.255.
IP lease offer: DHCP server replies with an IP address, subnet mask, network gateway, name of the domain, name servers, duration of the lease and the IP address of the DHCP server.

Lease Selection: Client receives offer and broadcasts to al DHCP servers that will accept given offer so that other DHCP server need not make an offer.

The DHCP server then sends an ack to the client. The client is configured to use TCP/IP. Lease Renewal: When half of the lease time has expired, the client will issue a new request to the DHCP server.

Installation of DHCP server: First of all while install the RedHat Linux enterprise version server be careful about the ports and the services must be turned on. To create DHCP server in Linux first download DHCP RPM package and install with "rpm-ivh" command. Where I have done it there I have create YUM server, so easily I have download and install it by YUM (yum install dhcp version). DHCP package will locate in /usr/share/doc/at Linux file system. I copied the DHCP's files from /usr/share/doc/ to /etc/dhcpd.conf.. Then I started to configure the dhcpd.conf file to route the DHCP server in there local network. I have open the configuration file with "vi" command. Then commented out the lines from "default gateway to option netbios" because system don't read the commented lines. After that I set the range of IP address in dynamic- bootp of their local assumption of system. I have change the "next-server" with the dhcp server name and have also change the fixed address with the dhcp server IP address (end range of dynamic IP). It is very easy job to configure DHCP server. After configure the .conf file of dhcp just turn on the service with "chkconfig" command and restart the dhcp service. After that entire job I reboot the system. And after rebooting of server I turned on the other client system. While startup the client system without static IP address all of those picked up IP from dhcp server and going on successfully. I have prefer the command line mode to do the total job.
The DHCP server configure file is following:

ddns-update-style interim
ignore client-updates

subnet 192.168.1.0 netmask 255.255.255.0 {
# The range of IP addresses the server
# will issue to DHCP enabled PC clients
# booting up on the network

range 192.168.1.201 192.168.1.220;
# Set the amount of time in seconds that
# a client may keep the IP address

default-lease-time 86400;
max-lease-time 86400;

# Set the default gateway to be used by
# the PC clients

option routers 192.168.1.1;
# Don't forward DHCP requests from this
# NIC interface to any other NIC
# interfaces

option ip-forwarding off;

# Set the broadcast address and subnet mask
# to be used by the DHCP clients

option broadcast-address 192.168.1.255;
option subnet-mask 255.255.255.0;

# Set the NTP server to be used by the
# DHCP clients

option ntp-servers 192.168.1.100;

# Set the DNS server to be used by the
# DHCP clients

option domain-name-servers 192.168.1.100;

# If you specify a WINS server for your Windows clients,
# you need to include the following option in the dhcpd.conf file:

option netbios-name-servers 192.168.1.100;

# You can also assign specific IP addresses based on the clients'
# ethernet MAC address as follows (Host's name is "laser-printer":

host laser-printer {
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 192.168.1.222;
}
}
#
# List an unused interface here
#
subnet 192.168.2.0 netmask 255.255.255.0 {
}

on Mar 17, 2011 | Computers & Internet

1 Answer

Why am I losing internet speed when using router goes fro 60mps to 5-10 mps


how did you bypass the router ? what is connecting to the internet if you bypass the router ? question is the device connecting to the internet got a DHCP server and does the router have a DHCP server. What IP ranges are the two DHCP servers allocating.
You may need to switch off one of the DHCP servers in one of the two devices. Probably the DHCP servers are confusing each other .
Only my educated guess with the limited information on how your network devices interact. .

Jan 01, 2015 | NetGear Computers & Internet

2 Answers

We have a DHCP problem with our thin client HP T5540, the network interface can't get an ip address fom the DHCP server for 30 seconds so it can't connect to citrix xen serverver for virtualization...


First of all check the configuration of the unit if it's AUTOMATIC IP/DHCP, if all OK you can test by configuring a static IP (use an unused IP in the server's DHCP table) than check the connectivity (ping something), if that works you have a server rule/DHCP or DNS problem

if it's still not working check the cabeling and connectors for connectivity (with a good cable tester) or an other (working) computer.

Good luck!

Oct 22, 2010 | HP t5540 VIA Eden 1GHz Thin Client...

1 Answer

DHCP installation problem


First of all, read this M$ article on setting up DHCP: http://support.microsoft.com/kb/139904

Secondly, check the following:
1. You have defined a valid scope and ACTIVATED it
2. You have AUTHORISED the DCHP server in Active Directory (see http://technet.microsoft.com/en-us/library/cc759688(WS.10).aspx)
3. Make sure that there are enough unused IPs in the address pool
Make sure that the DHCP server service is running - and check the EVENT LOG for errors
4. Make sure that there is no other, especially unauthorized, DHCP servers (i.e. router with DHCP enabled)

Actually the best article overall to review is http://technet.microsoft.com/en-us/library/cc781697(WS.10).aspx, which gives a big picture view regarding the role of DHCP autorization and what can happen in a mixed environment

May 21, 2009 | Microsoft Windows Server 2003 Enterprise...

2 Answers

Sending DHCP request across diffrent vlans


Hmm... on your DHCP server, try setting the "default router" IP for each pool to be the VLAN ID on the switch.

scope 172.16.0.0 /24
router 172.16.0.1

scope 10.20.8.0 /22
router 10.20.8.1

I think the DHCP replies aren't going back where they should. I've never done this without a router doing all the DHCP, but it does work and i've done it many times. Your config looks spot on for the switch.

Feb 01, 2009 | Cisco Catalyst 3750E-48PD

1 Answer

Dhcp in server 2003 in domain not working


Windows 2003 server supports DHCP. If you don't see in Administrative tool DHCP maybe the DHCP role is not enabled. You can add this role in "Manage your server". You don't need to reinstall win 2003 server.
Another way to access DHCP management tool is: in command prompt type mmc and then File> "Add remove snap-in" then "Add" and select DHCP.

Jan 06, 2009 | Microsoft Windows Server Standard 2003 for...

1 Answer

DHCP Tool not have my Administrative Tools


hi,

just check whether the services are authomatic running or not



ramana

Jul 02, 2008 | Microsoft Windows Server Standard 2003 for...

1 Answer

Xbox 360


Either the network connection between the 360 and router is not working correctly, or your router is not configured properly for DHCP.

DHCP (Dynamic Host Configuration Protocol) is a protocol that automatically assigns a network address (and some other settings) to your computer....or Xbox in this case. It works like this....when your Xbox connects to the network, it sends out a broadcast packet on the network that looks for a DHCP server. If a DHCP server is present, it responds. Next the Xbox requests its network address and other settings from the DHCP server. Your WGR614 router has a DHCP server function built in, but it may not be enabled. Try reconfiguring the router using the Netgear "Smart Wizard" installation CD and be sure to enable the DHCP capability, if asked.

Jan 10, 2008 | NetGear WGR614 Wireless Router

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