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Source code for asset tracking system

Monitoring the system configuration and system details from the server of the other clients without any disturbance to the clients.it is also used to identify the misplacing components of the clients.if any mismatch found in the client it should be alerted in the server.

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Just take a look to this site:
http://www.codeproject.com/
you'll get all your answers about VB and totally .NET there by a simple search
enjoy it!

Posted on Feb 21, 2009

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Posted on Jan 02, 2017

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Issue with time synchronizing(NTP) on layer 2 switch


I know this is probably not going to help you out but you did try going to Alcatel-Lucents web page and search through there or calling them at 800 995-2696? Good Luck! Sorry I couldn't be of some help

Mar 04, 2014 | Alcatel OmniSwitch 6850 (OS6850-48)

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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

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Server 2003 & client configuration


<p><span>Some days before I have done a job on Windows Server 2003 Enterprise edition & Client XP. It is departmental food court. In the office room of the restaurant have a system which will be Server system and main domain. There was another 8 system in every department of food <span> </span>with printer for billing.I</SPAN><br> <p><span>Windows Server 2003 includes a mission critical Windows Server operating system, such as security, reliability, availability, and scalability.</SPAN><br> <p><span>You have to install DNS server for DC without DNS the client computers wouldn't know which one is DC.You can host DNS on a different server than DC.</SPAN><br> <p><span>Before Starting the DC installation process you need to make sure the <span> </SPAN>following points</SPAN><br> <p><span> </SPAN><br> <p><span>1)You have installed Basic windows server 2003 installation</SPAN><br> <p><span>2)Make sure you have assigned a static ip address to your server</SPAN><br> <p><span><span> </SPAN>Now start DC and DNS Setup process</SPAN><span></SPAN><br> <a><span> </SPAN></A> <span><span>Domain Controller</SPAN></SPAN><span></SPAN> <span>Active Directory is a huge topic in itself. While DCPROMO is easy to run, planning of both the physical and the logical structure is the key to a trouble free active directory. </SPAN> <p><span>Domain controllers do not have to be your most powerful machines, however they must be reliable and always available to answer logon requests. </SPAN><br> <a><span>DNS (Domain Name System)</SPAN></A><span><span> </SPAN></SPAN><span>Role</SPAN> <p><span>Once DNS is setup, it runs itself thanks to the new dynamic component hence DDNS. TCP/IP knowledge plus understanding of how DNS works is essential when troubleshooting connectivity problems.</SPAN><br> <p><span>DNS enables client machines to resolve servers IP addresses. Once the client finds the server, Active Directory uses LDAP to locate services like Kerberos, Global Catalog that clients request.</SPAN><br> <a><span>Print Server Role</SPAN></A><span></SPAN> <p><span>In my experience there is a contrast between the software settings which are easy to configure and the hardware which constantly need for attention e.g. paper jam, 'out of toner'. Check list for print server:</SPAN><br> <p><span></SPAN> <br> <p><span>Printer Priority</SPAN><br> <p><span>Network Printers</SPAN><br> <p><span></SPAN><br> <p><b><span>Client Configuration :- </SPAN></B><span>After</SPAN><span><span> Installation of Windows Xp give the IP Add on TCP/IP of IPV4.If you want to manually configure DNS server addresses, click</SPAN></SPAN><span><span> </SPAN></SPAN><b><span>Use the following DNS server addresses</SPAN></b><span><b><span>,</SPAN></B></SPAN><span><span> and then type the preferred DNS server and alternate DNS server IP addresses in the</SPAN></SPAN><span><span> </SPAN></SPAN><b><span>Preferred DNS server</SPAN></b><span><span> </SPAN></SPAN><span><span>and</SPAN></SPAN><span><span> </SPAN></SPAN><b><span>Alternate DNS server</SPAN></b><span><span> </SPAN></SPAN><span><span>boxes. After all job try to ping each other. I'm trying this and it also pinging. Files and data also can be shared through it.</SPAN></SPAN>

on Feb 15, 2011 | Computers & Internet

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Dear Sir, We have one IBM x206 8482 I8S Serer. We have loaded Win XPP to this system and configured as Thin Client Server. The Thin Clients hang during the operation. The Thin client Vendor identifies this...


You have a compatibility issue as per your comments and you have no choice but to use the components and operating system that will work with each other. Without drivers you are in deep doo doo and there is no forcing the issue.

Apr 07, 2017 | IBM eServer xSeries 206

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Server details are not incorrect but being told they are


Hi here are the server details for yahoo. Please check them against your current configuration and reply back with OS, Mail client and your error details if this configuration doesnt work.
  • Incoming server - imap.mail.yahoo.com
  • Outgoing Server - smtp.mail.yahoo.com
  • Incoming port - 993 (SSL enabled)
  • Outgoing port - 465 (Again SSL or TLS enabled)
  • Username - full email address@yahoo.com
  • Password - your password.

Thank you.

Mar 03, 2011 | Yahoo Mail

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Difference between proxy server firewall and something called a gateway firewall ....Just a homework question..need another angle other then the veryconfusing textbook


In computer networks, a proxy server is a server (a computer system or an application program) that acts as an intermediary for requests from clients seeking resources from other servers. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource, available from a different server. The proxy server evaluates the request according to its filtering rules. For example, it may filter traffic by IP address or protocol. If the request is validated by the filter, the proxy provides the resource by connecting to the relevant server and requesting the service on behalf of the client. A proxy server may optionally alter the client's request or the server's response, and sometimes it may serve the request without contacting the specified server. In this case, it 'caches' responses from the remote server, and returns subsequent requests for the same content directly.
A proxy server has many potential purposes, including:
  • To keep machines behind it anonymous (mainly for security).[1]
  • To speed up access to resources (using caching). Web proxies are commonly used to cache web pages from a web server.[2]
  • To apply access policy to network services or content, e.g. to block undesired sites.
  • To log / audit usage, i.e. to provide company employee Internet usage reporting.
  • To bypass security/ parental controls.
  • To scan transmitted content before delivery for malware.
  • To scan outbound content, e.g. for data leak protection.
  • To circumvent regional restrictions.
A proxy server that passes requests and replies unmodified is usually called a gateway or sometimes tunneling proxy.
A proxy server can be placed in the user's local computer or at various points between the user and the destination servers on the Internet.
A reverse proxy is a (usually) Internet-facing proxy used as a front-end to control and protect access to a server on a private network, commonly also performing tasks such as load-balancing, authentication, decryption or caching

A firewall is a dedicated appliance, or software running on a computer, which inspects network traffic passing through it, and denies or permits passage based on a set of rules.
It is a software or hardware that is normally placed between a protected network and an unprotected network and acts like a gate to protect assets to ensure that nothing private goes out and nothing malicious comes in.
A firewall's basic task is to regulate some of the flow of traffic between computer networks of different trust levels. Typical examples are the Internet which is a zone with no trust and an internal network which is a zone of higher trust. A zone with an intermediate trust level, situated between the Internet and a trusted internal network, is often referred to as a "perimeter network" or Demilitarized zone (DMZ).
A firewall's function within a network is similar to physical firewalls with fire doors in building construction. In the former case, it is used to prevent network intrusion to the private network. In the latter case, it is intended to contain and delay structural fire from spreading to adjacent structures.
Without proper configuration, a firewall can often become worthless. Standard security practices dictate a "default-deny" firewall ruleset, in which the only network connections which are allowed are the ones that have been explicitly allowed. Unfortunately, such a configuration requires detailed understanding of the network applications and endpoints required for the organization's day-to-day operation. Many businesses lack such understanding, and therefore implement a "default-allow" ruleset, in which all traffic is allowed unless it has been specifically blocked. This configuration makes inadvertent network connections and system compromise much more likely.

Dec 11, 2009 | Office Equipment & Supplies

2 Answers

I can receive emails, but not send them. The error message says that my server does not recognize my email account. What can I do to be able to send emails since I am receiving them? John


Either your email service has changed their outgoing server or they are having issues. Contact your email provided to ensure you have the correct smtp server listed in your email program..

Jul 06, 2009 | Computers & Internet

1 Answer

Every time i try to get on youtube it comes up.But when i click on my account it says 400 bad request. when i tryed to click on my friends video of gymnastics it says 400 bad request. Please Help Quick


Introduction
The Web server (running the Web site) thinks that the data stream sent by the client (e.g. your Web browser or our CheckUpDown robot) was 'malformed' i.e. did not respect the HTTP protocol completely. So the Web server was unable to understand the request and process it.

It almost always means bad programming of the client system and/or the Web server. 

400 errors in the HTTP cycle

Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle:
Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs). 
Open an IP socket connection to that IP address. 
Write an HTTP data stream through that socket. 
Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information. 

This error occurs in the final step above when the client receives an HTTP status code it recognises as '400'.

Fixing 400 errors - general

There is a low-level program bug in the client or the Web server or both. If you do not have access to the source code for these systems, the only thing you can do is refer the problem to technical support people at the companies that developed the systems.

Fixing 400 errors - CheckUpDown

You should never see this error at all when you use our CheckUpDown service. It indicates that the two systems (our robot and the Web server) fundamentally disagree on the syntax of HTTP data streams.

Please contact us directly (email preferred) whenever you encounter 400 errors. Only we can resolve them for you. Unfortunately this may take some time, because we have to analyse the underlying HTTP data streams and may have to liaise with your ISP and the vendor of the Web server software to agree the exact source of the error.

Jun 14, 2009 | YouTube Videos

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...

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