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Cannot renew ip address and the dhcp client won't start and a few other programs won't start

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Please restart your system and check it otherwise repair or reinstall your lan driver and configure tcp/ip.

Posted on Oct 06, 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

Tip

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

Tip

Error: 169.x.x.x IP Address


<p><b>Information:</b><br /> <p><span>This article outlines methods of resolving issues with a 169.x.x.x IP address. <span>This address results from a built in feature of windows called automatic private IP address(APIPA). When your computer is unable to find a DHCP server the APIPA service will assign itself a 169.x.x.x IP address. According to Microsoft, the APIPA service checks for a DHCP server every five minutes. </span></span><br /> <p><span><span><b>Workaround:</b></span></span><br /> <p><span><span><b>Releasing the IP address</b></span></span><br /> <p><span><span>1. Click on Start and click Run.<br />2. Inside Run, type ipconfig /release to release the IP address.<br />3. Then after the IP address is released, type ipconfig /renew</span></span><br /> <p><span><span><b>Disabling the Ethernet Adapter</b></span></span><br /> <p><span><span>1. Click on Start and right click on My Computer. Then click on Manage.<br />2. Click on Device Manager and then Network Adapters<br />3. Under Network Adapters, right click on your Ethernet adapter and select Disable. <br />4. Wait approximately 5 seconds and right click on it and click Re-enable. <br />5. This restarts the DHCP client and tries to obtain an IP address from the Network.</span></span><br /> <p><span><span><b>Check the Ethernet cable</b></span></span><br /> <p><span><span>Sometimes a bad Ethernet cable can cause your system to receive a 169 IP address, try changing out the cable for a new one.</span></span><br /> <p><span><span><b>Disable antivirus and firewall applications</b></span></span><br /> <p><span><span>Disable/uninstall any external firewall, antivirus, or spyware programs (eg. Norton Internet Security, McAfee Security Center, Trend Micro 2007, Webroot).</span></span><br /> <p><span><span><b>Restarting the QoS packet scheduler Protocol</b></span></span><br /> <p><span><span>1. Click on Start and click Control Panel.<br />2. In Control Panel, double click on Network Connections and then Local Area Connection.<br />3. Click on Properties and uncheck QoS Packet Scheduler. <br />4. Click Ok and repeat the process. <br /></span></span><br /> <p><span><span><b>Restarting the DHCP service</b></span></span><br /> <p><span><span>1. Click Start and select Run. <br />2. Type services.msc in Run and click Ok.<br />3. Find DHCP service and right click on it. Click on Stop.<br />4. Reboot the computer.<br />5. When the computer boots up, click Start and select Run<br />6. Inside Run, type the following: netsh int ip reset log.txt<br />7. Click Ok.</span></span><br /> <p><span><span><b>System Restore</b></span></span><br /> <p><span><span>1. Open Start and click on Programs and then Accessories.<br />2. Then click on System Tools.<br />3. Click on System Restore and select a restore point when you were not experiencing this problem.<br />4. Restore your system.</span></span>

on Mar 15, 2011 | Computers & Internet

1 Answer

My router can not access dhcp.Why?


A DHCP Reservation is a permanent IP address assignment. It is a specific IP address within a DHCP scope that is permanently reserved for leased use to a specific DHCP client.
You can configure a DHCP reservation in your DHCP server when you need to reserve a permanent IP address assignment. You can use these reservations for DHCP-enabled devices like print and file servers or other application servers which always have the fixed IP address on a network.
To configure a DHCP reservation, follow the steps provided below:

Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the web-based setup page on a Mac computer, click here.
Step 2:
Click Setup > Basic Setup.

kb17362-001_en.png
Step 3:
Make sure that the DHCP Server option is Enabled. Click the DHCP Reservation button if you want to assign a fixed local IP address to a MAC address.

kb17362-002_en.png
Step 4:
When you click on DHCP Reservation, a new web browser window will pop-up. Click the Select checkbox to reserve a client's IP address. Click the Add Clients button afterwards.

kb17362-003_en.png Step 5:
If you want to manually assign an IP address, enter the client's host name in the Enter Client Name field. You can do this as well in the IP Address and MAC address fields.
Step 6:
Click the Add button.

kb17362-004_en.png
Step 7:
A list of DHCP clients and their fixed local IP addresses will be displayed at the bottom of the screen. If you want to remove a client from this list, click the Remove button.

kb17362-005_en.png

On this window, you can do any of the following:
• Click the kb17362-006_en.png button to save your changes.
• Click the kb17362-007_en.png button to cancel your changes.
• To view the most up-to-date information, click the kb17362-008_en.png button.
• To exit this screen, click the kb17362-009_en.png button

If you need more help come back.Post / thumbs / testimonial are welcome!.

Nov 20, 2010 | Linksys WRT160N Wireless Router

1 Answer

I have a dlink router of model DI-1750, i have to configure DHCP..can anyone help me regarding the configuration commands.


A DHCP Reservation is a permanent IP address assignment. It is a specific IP address within a DHCP scope that is permanently reserved for leased use to a specific DHCP client.
You can configure a DHCP reservation in your DHCP server when you need to reserve a permanent IP address assignment. You can use these reservations for DHCP-enabled devices like print and file servers or other application servers which always have the fixed IP address on a network.
To configure a DHCP reservation, follow the steps provided below:

Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the web-based setup page on a Mac computer, click here.
Step 2:
Click Setup > Basic Setup.

kb17362-001_en.png
Step 3:
Make sure that the DHCP Server option is Enabled. Click the DHCP Reservation button if you want to assign a fixed local IP address to a MAC address.

kb17362-002_en.png
Step 4:
When you click on DHCP Reservation, a new web browser window will pop-up. Click the Select checkbox to reserve a client's IP address. Click the Add Clients button afterwards.

kb17362-003_en.png Step 5:
If you want to manually assign an IP address, enter the client's host name in the Enter Client Name field. You can do this as well in the IP Address and MAC address fields.
Step 6:
Click the Add button.

kb17362-004_en.png
Step 7:
A list of DHCP clients and their fixed local IP addresses will be displayed at the bottom of the screen. If you want to remove a client from this list, click the Remove button.

kb17362-005_en.png

On this window, you can do any of the following:
• Click the kb17362-006_en.png button to save your changes.
• Click the kb17362-007_en.png button to cancel your changes.
• To view the most up-to-date information, click the kb17362-008_en.png button.
• To exit this screen, click the kb17362-009_en.png button.

If you need more help come back.Post / thumbs / testimonial are welcome!

Nov 20, 2010 | D-Link Computers & Internet

Tip

Resolving 169.x.x.x IP address problems


This article outlines methods of resolving issues with a 169.x.x.x IP address. This address results from a built in feature of windows called automatic private IP address(APIPA). When your computer is unable to find a DHCP server the APIPA service will assign itself a 169.x.x.x IP address. According to Microsoft, the APIPA service checks for a DHCP server every five minutes.

Releasing the IP address
1. Click on Start and click Run.
2. Inside Run, type ipconfig /release to release the IP address.
3. Then after the IP address is released, type ipconfig /renew

Disabling the Ethernet Adapter
1. Click on Start and right click on My Computer. Then click on Manage.
2. Click on Device Manager and then Network Adapters
3. Under Network Adapters, right click on your Ethernet adapter and select Disable.
4. Wait approximately 5 seconds and right click on it and click Re-enable.
5. This restarts the DHCP client and tries to obtain an IP address from the Network.

Check the Ethernet cable
Sometimes a bad Ethernet cable can cause your system to receive a 169 IP address, try changing out the cable for a new one.
Disable antivirus and firewall applications
Disable/uninstall any external firewall, antivirus, or spyware programs (eg. Norton Internet Security, McAfee Security Center, Trend Micro 2007, Webroot).
Restarting the QoS packet scheduler Protocol
1. Click on Start and click Control Panel.
2. In Control Panel, double click on Network Connections and then Local Area Connection.
3. Click on Properties and uncheck QoS Packet Scheduler.
4. Click Ok and repeat the process.

Restarting the DHCP service
1. Click Start and select Run.
2. Type services.msc in Run and click Ok.
3. Find DHCP service and right click on it. Click on Stop.
4. Reboot the computer.
5. When the computer boots up, click Start and select Run
6. Inside Run, type the following: netsh int ip reset log.txt
7. Click Ok.

System Restore
1. Open Start and click on Programs and then Accessories.
2. Then click on System Tools.
3. Click on System Restore and select a restore point when you were not experiencing this problem.
4. Restore your system.

on Jun 14, 2010 | Computers & Internet

Tip

IP address 0.0.0.0


First of all, disable and re-enable the connection. When you change the IP address from automatic to a fixed IP address while the adapter is not connected, you always get a 0.0.0.0 address at first when the adapter reconnects. If this doesn't solve the problem, read on.
Symptoms:
  • You cannot obtain an IP address from the DHCP server. The IP address is 0.0.0.0.
  • The DHCP service is not running, although it is set to Start Automatic.
  • When you try to start the DHCP service, you get the error message: Could not start the DHCP Client Service on Local Computer. Error 1075: The dependency service does not exist or has been marked for deletion.
This problem can occur after uninstalling Norton AntiVirus, which sets the DHCP service as depending on itself. It can also occur when the computer name of the client computer is too long. Make sure that all computer names in your network are no longer than 15 characters.
First set a restore point, so you can undo your changes, should anything go wrong (Programs, Accessories, System programs, System restore).
After setting the restore point, to remove this dependency, do this:
  • Click: Start
  • Click: Run...
  • Type: regedit
  • Click: OK
p%201.jpg
  • Navigate to the following keys in the registry:
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DHCP
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NetBT
p%202.jpg p%203.jpg
  • For each of these, on the right side, double-click: DependOnService
  • Delete any lines containing either SYMTDI or NISDRV.
  • Click: OK
  • Close the Registry Editor.
  • Reboot.

on Mar 29, 2010 | Computers & Internet

1 Answer

What is BOOTP/DHCP?


BOOTP stands for Bootstrap Protocol. DHCP stands for Dynamic Host Configuration Protocol. Both are mechanisms to dynamically assign an IP address for a TCP/IP client by the server. In this case, the Prestige 310 Internet Access Sharing Router is a BOOTP/DHCP server. Win95 and WinNT clients use DHCP to request an internal IP address, while WFW and WinSock clients use BOOTP. TCP/IP clients may specify their own IP or utilize BOOTP/DHCP to request an IP address.

Feb 19, 2006 | Zyxel Prestige 310 (AM406100) Router

1 Answer

Static DHCP


Step 1 Open your web browser and enter the IP address of your D-Link router (192.168.0.1). Enter username (admin) and your password (blank by default). Step 2 Click on the Home tab and then click DHCP on the left column. Step 3 Under the Static DHCP section next to DHCP Client, select one of the DHCP clients from the list and click Clone. Step 4 Select Enabled and enter the IP address you would like this client to always obtain. Step 5 Verify that the Name and MAC Address fields have the correct Hostname and MAC address for the client and click Apply. If the Hostname or MAC address is not correct, Release and Renew the IP address on the client and then refresh the DHCP page.

Feb 16, 2006 | D-Link Express EtherNetwork DI-604 Router

Tip

Resolving 169.x.x.x IP address problems.


Information:
This article outlines methods of resolving issues with a 169.x.x.x IP address. This address results from a built in feature of windows called automatic private IP address(APIPA). When your computer is unable to find a DHCP server the APIPA service will assign itself a 169.x.x.x IP address. According to Microsoft, the APIPA service checks for a DHCP server every five minutes.
Workaround:
Releasing the IP address
1. Click on Start and click Run.
2. Inside Run, type ipconfig /release to release the IP address.
3. Then after the IP address is released, type ipconfig /renew

Disabling the Ethernet Adapter
1. Click on Start and right click on My Computer. Then click on Manage.
2. Click on Device Manager and then Network Adapters
3. Under Network Adapters, right click on your Ethernet adapter and select Disable.
4. Wait approximately 5 seconds and right click on it and click Re-enable.
5. This restarts the DHCP client and tries to obtain an IP address from the Network.

Check the Ethernet cable
Sometimes a bad Ethernet cable can cause your system to receive a 169 IP address, try changing out the cable for a new one.
Disable antivirus and firewall applications
Disable/uninstall any external firewall, antivirus, or spyware programs (eg. Norton Internet Security, McAfee Security Center, Trend Micro 2007, Webroot).
Restarting the QoS packet scheduler Protocol
1. Click on Start and click Control Panel.
2. In Control Panel, double click on Network Connections and then Local Area Connection.
3. Click on Properties and uncheck QoS Packet Scheduler.
4. Click Ok and repeat the process.

Restarting the DHCP service
1. Click Start and select Run.
2. Type services.msc in Run and click Ok.
3. Find DHCP service and right click on it. Click on Stop.
4. Reboot the computer.
5. When the computer boots up, click Start and select Run
6. Inside Run, type the following: netsh int ip reset log.txt
7. Click Ok.

System Restore
1. Open Start and click on Programs and then Accessories.
2. Then click on System Tools.
3. Click on System Restore and select a restore point when you were not experiencing this problem.
4. Restore your system

on Mar 29, 2010 | Computers & Internet

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