Question about CP International WBR-3406TX Wireless Router

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DHCP address DHCP server doesn't issue new address to a wireless client. Or sometimes it can assing an IP address but then connection is dropped (in about 5 minutes) and no IP address issued any more. This usually happens in the night. When I try it in the morning (before leaving for work, so I can't test it longer than 10 minutes. But even 10 minutes is longer than those at most 5 min I can have in the night) it seems to work fine. The thing works fine for the wired connections (I have 2 other machines connected to the router). And it used to work okay for wireless client about 6 mo ago.

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I would start by resetting it to default settings and re-configuring the router. Oftentimes that is all that is needed to fix the problem. If not invest in a new router.

Posted on Feb 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

1 Answer

My PC is connected to this modem/router and works fine. All the laptops in the house show that they are connected but I can't get any websites on any of them. Also, when I connect the laptop with an...


Log in on your router manager http://192.168.x.x and enable DHCP.DHCP provides an automated way to distribute and update IP addresses and other configuration information on a network. A DHCP server provides this information to a DHCP client through the exchange of a series of messages, known as the DHCP conversation or the DHCP transaction. If the DHCP server and DHCP clients are located on different sub-nets, a DHCP relay agent is used to facilitate the conversation.

  1. Connect to your router (by typing 192.168.0.1 or 192.168.1.1 into the URL bar) and log in. Check your user manual or documentation if you do not know the log-in credientials.
  2. 180px-dhcp_router_setup.jpg magnify-clip.png Router Setup tab Make sure you are in the Setup -> Basic Setup category.
  3. 180px-dhcp_router_disabled.jpg magnify-clip.png DHCP is Disabled Scroll down until you see 'DHCP Server' - if it is disabled, select 'Enable'
  4. 180px-dhcp_router_enabled.jpg magnify-clip.png Enable DHCP If you want, you can change the number that the DHCP IP assigning starts. This is optional, and is totally dependant on personal preference.In this picture, the maximum number of DHCP clients is 3. You may need to increase this number according to how many people will need a dynamic IP address on your network. Once the max is reached, no one else can get an address until one expires!
  5. Use the DNS servers provided to you by your ISP, or use the following DNS servers: 205.152.37.254, 205.152.132.235, 205.152.132.23; There are many DNS servers out there. It's best to use your ISP's if possible.
  6. dhcp_router_save.jpg magnify-clip.png Don't forget to save! Scroll down and click 'Save Settings'
  7. Open up the network configurations for the computers on your network (Control Panel -> Network Connections -> Local Area Connection or Wireless Connection) and select 'Obtain IP address automatically'

Dec 09, 2010 | Actiontec GT704WG Wireless Router...

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

2 Answers

I am trying to install a Netgear router after my switch. I end up having no internet on some of the computers connected to the hub and none on the router. If I configure the router as a dhcp client...


You'll want to configure your router as a dhcp server. Connect the switch to your router's lan port. Connect the remaining devices to a port on the switch. Your wireless access point should have it's dhcp server disabled. You can only have one dhcp server per network. The wireless can get it's address from the router's dhcp and the wireless client devices will get their ip address from the router, as well. If your wireless access point is a router with a wan/broadband port and some switch ports you will want to make sure that you are connecting to your Asus switch via one of the switch ports.
Be sure that your client devices are configured to get their ip address via dhcp and you should be surfing the interweb in no time flat.

Oct 21, 2010 | ASUS GX1008B 10100Mbps Desktop Unmanaged...

2 Answers

Have already described this probelm four times and paid for premium assistance. Hello????


if you have problem sir/mam just contact me. Reggie is your best contact solution to your problems.. Thanks

Mar 27, 2008 | Computers & Internet

2 Answers

Wireless internet hookup


What seems to be the problem of your wireless internet?

Mar 27, 2008 | Computers & Internet

1 Answer

Laptop (Averatec Model #3150


Hi
I am try to take a stab at answering your query.

Internet Protocol (IP) Address preceeding with "169" means your PC is not receiving IP Address "generally" from your Boradband Modem or Internet Service Provider (ISP). The PC through Automatic Private Internet Protocol Addressing (APIPA) is assigning itself a temporal IP address.
This conditions means either
1. Dynamic Host Configuration Protocol (DHCP) Client service is not running properly on your PC (Unlikely)
2. There is no connection between your PC and Broadband Device or ISP wired or wirelessly (very likely)
3. DHCP Server Service is not configured or not running on Boardband device (likely) or ISP (unlikely)
4. Some firewall software when improperly configured are known to block all ports and services. This can block TCP Ports 67 and 68 used by DHCP Client/Server communication (quite likely)
Some pointers for more info;
1. Your query suggest your issues are limited to Wireless connection. Can you access Internet through wired connection? If so;
a) What Wired connection is in use? USB or Ethernet?
b) Is wired connection through same Broadband device?
c) What IP is assigned to your PC in wired connection?
d) If wired connection works, is IP assignment static or by DHCP?
e) What Boardband device is in use? In which mode is the device set to? Router/Bridge
2. If you can't connect both wired and wireless, then it is unlikely your PC hardware is at fault. Call your Broadband Provider for further help and configuration. Try entily disabling your firwall software (if installed) and test conection.
3. If you can connect through wired connection and your IP Address does not proceed with "192.168" or "172.16" then your boadband device is likely in a bridge mode. In bridge mode, the DHCP Server Service on your boardband device is disabled. Most ISPs will only assign only one IP address to a user. If an IP address has been assigned to your PC on the wired connection, then the wireless connection will not receive an IP address and therefore your PC will assign itself an IP in the range "169.254"

Regards
Mike

Mar 27, 2008 | Averatec 3150H Notebook

2 Answers

Trying to hook up lap top to wireless internet. Comcast tech says there is problem with IP# 169 which preceeds other numbers and needs to be removed for hookup. How can I accomplish this? Model #3150H


Usually you will have an IP address starting with 169 if the adapter cannot get an ip address from anywhere, it is an autmoatic IP address.

What operating system (Windows XP or 2000 or Vista) are you using?

Mar 27, 2008 | Computers & Internet

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