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How to fix an IP address conflict?
Ever get the following message when turning on your computer or taking it out of sleep mode?
“There is an IP address conflict with another system on the network”
You may also see a different error message for the same problem:
“This IP address is already in use on the network. Please reconfigure a different IP address.”
This occurs when two computers on the same LAN network end up with the same IP address. When this occurs, both computers end up not being able to connect to network resources or perform other network
operations.
This problem, though rare, can occur because of the following reasons:
1.Two computers are assigned the same static IP addresses
2.One computer is assigned a static IP address that falls into the DHCP range for the local network and the same address is assigned to a computer by the DHCP server
3.A laptop is put into sleep mode and then turned on while connected to another network that uses the same IP address
4.If you have multiple network adapters, it is possible for a to have an IP address conflict with itself
How to resolve an IP address conflict:
There are a few ways you can go about fixing this problem. I’ll start with the simplest and move on.
1. Renew IP Address – You can release and renew the IP address for your computer using the command prompt. Read my previous post on how to renew an IP address.
2. Reconfigure Static IP Address – If your computer is using a static IP address, it is best to try and use a different one in the same subnet. One way to check to make sure the one you are picking is not already being used is to simple ping the IP addresss (ping x.x.x.x).
3. Use DHCP – If you don’t need to use a static IP address, it’s best to simply choose DHCP instead of manually configuring the IP address. The server will know which addresses are free and which are taken.
4. Update firmware – In some rare instances, the actual DHCP server can malfunction and assign more than one computer the same IP. In this case, it is best to try and update the firmware on your router.
How To Find Out What My DNS Servers Address Is?
How do I find out my DNS Server Addresses under Linux / UNIX / Windows operating system? What is my dns server IP address under Windows operating systems? Can you specify a list of public DNS server for personal use or game consoles?
DNS is key to many network services. Internet browsing, mail server, web server etc all depends upon DNS server. Most ISP (Internet service provider) have their own caching dns server to reduce network load. But how do you find out DNS server IP address? How do you find out current DNS server IP address? Under Linux, FreeBSD and all UNIX like oses you have file called /etc/resolv.conf file. It is often know as resolver configuration file. If you are using MS-Windows version Vista / 7 / NT / 2000 / XP /98 etc then see below for how to find out DNS server address under MS-Windows operating systems.
Linux / UNIX / Apple OS X Find Out Dns Server Addresses:
The resolver is a set of routines in the C library that provide access to the Internet Domain Name System (DNS). The resolver configuration file contains information that is read by the resolver routines the first time they are invoked by a process.
Commend to find out your dns servers ip address under Linux/BSD/Unixish system
To see your DNS server address type following command as shell prompt:
$ cat /etc/resolv.conf
OR
$ less /etc/resolv.conf nameserver 203.54.1.20 nameserver 203.54.1.21
Where,
nameserver 203.54.1.20 : It is Name server IP address (in dot notation) of a name server that the resolver should query. All your application will use this IP address for DNS purpose.Where,
Find Out DNS Server IP Address Under MS-Windows Version 7/Vista/XP/NT/2003
Click on Start button > Run > and Type command cmd > Press [enter] key
At DOS prompt type the command:
C:\>ipconfig /all
You should DNS server IP address, and other information related to Windows networking:
OR
You can Click on Start button > Settings > Network connections
Double click on Local Area Connection
Click on Properties button
Select Internet Protocol (TCP/IP)
Click on Properties button and Look for Preferred DNS Server:
You Can Use The Public DNS Servers:
You can use the following Google public DNS (IP Addresses) servers for XBOX 360 / Sony PS3 & PS2 / Nintendo Wii game consoles or any other purpose:
8.8.8.8
8.8.4.4
They are free to all, pretty fast too and works with all sort of computers and game consoles.You Can Use The Public DNS Servers
Free DNS Server:
OpenDNS Free DNS Server IP address
=> 208.67.222.222
=> 208.67.220.220
ScrubIT Free DNS Server IP address
=> 67.138.54.100
=> 207.225.209.66
How do I setup DNS Server IP address?
Under Linux / UNIX / Solaris / BSD operating systems, just open your /etc/resolv.conf file and add above IP address:
nameserver 208.67.222.222 nameserver 208.67.220.220
How To Set Up A Network Domain:
Welcome to the wonderful world of domains and active directory.
Active Directory is centralized network management at it’s best. There are lots of reasons to set up a network domain and they include security, ease of administration and the ability to automate a lot of features that are cumbersome to roll out manually. Think about being able to manage all your user and computer accounts from one console. You can set “rules” for specific groups of users and say who can and cannot do what on YOUR network!
We will walk you through how to set up a Windows 2003 Active Directory Domain. To start you will need a Windows 2003 Server and the installation media that came with it. We will need to install the Windows DNS Server, configure the machine to have a static IP address and let it point to itself as your server’s DNS server. Grab everything you need and let’s get started.
When you start up your Windows 2003 Server you will see this screen:
To begin we will need to click the green arrow pointing to the right that says add or remove a role. This will start the wizard. Make sure you have all your network cables connected and your server online.
I would set your IP address to be static at this point if you have not already. To do so obtain a static IP address from your network administrator or choose one yourself if you are on your own network. To do this right click on network neighborhood and choose properties.
Next highlight Internet Protocol TCP/IP and hit the properties button to configure your IP address.
You will want to have the use the following IP address button checked as well as the use the following DNS server addresses button. Fill in the appropriate information and let’s move on. Click OK. That will take us back to our add a server role wizard. It will detect your settings as seen below:
Once it completes you will see the following screen:
If this is your first time setting up a domain run with the first option. This will install DNS and DHCP for you automatically. DNS stands for Domain Name Service and allows for your computers to talk to each other as well as connect to the Internet. DHCP stands for Dynamic Host Configuration Protocol and this allows computers to automatically have their IP addresses configured for them from your server. These services are very important for your network.
After you hit next we will see the screen that allows us to name our domain:
Choose your name carefully as it is almost impossible to change it later. You can use the extension .local instead of .com or .net to separate your domain from an Internet address. In this case we have AskTheAdmin.com which is a internet address and and active directory domain. If you are just testing you can use whatever you want to. The next screen asks you for your netbios names. You can leave these as the default. This is how older machines will see your computer and domain name.
Now we will get into how you want to handle name resolution. When you set up your clients to use your new internal DNS server you have an option of what to do with requests for Internet names like http://www.firstplanet.in. If you choose to forward queries to another server you can use your ISP’s DNS server to allow websites to be resolved. If you choose no your DNS server will not return web addresses and you might be unable to browse the Internet.
Click next and continue on. You will be asked to insert your Windows 2003 Server media and then you will see this screen telling you that you are complete.
You can now restart your server and begin setting up your users using the new shortcut on your start menu called Active Directory Users and computers like so:
That will take you to this console:
You can set up group policy or “rules” for each of your OU’s (organizational units) and that is a fancy name for the folders on the left. You can right click on any folder and choose properties –> group policy –> open to configure it.
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How To: Find IP Address Owner Via Terminal
I’m getting lots of spam from few IPs. How do I find the owner of an IP address and report them to concern parties?
All public IP address on the Internet is registered to ISP or an owner or a larger organization. Each IP address is recorded in the whois database. You can query this database to get owner name, phone, email address and so on the Internet using whois command line client.
Find IP Address For A Host Name
For instance to find the IP address for a http://www.firstplanet.in open a command line and type in:
host www.firstplanet.in
or
nslookup www.firstplanet.in
Sample output:
http://www.firstplanet.in is an alias for firstplanet.in.
firstplanet.in has address 174.37.118.32
firstplanet.in mail is handled by 0 firstplanet.in.
whois – Client For The Whois Directory Service
Type the following command to find out the owner of an IP address called 74.86.48.99:
$ whois 74.86.48.99
Sample Outputs:
OrgName: SoftLayer Technologies Inc. OrgID: SOFTL Address: 1950 N Stemmons Freeway City: Dallas StateProv: TX PostalCode: 75207 Country: US ReferralServer: rwhois://rwhois.softlayer.com:4321 NetRange: 74.86.0.0 - 74.86.255.255 CIDR: 74.86.0.0/16 OriginAS: AS36351 NetName: SOFTLAYER-4-4 NetHandle: NET-74-86-0-0-1 Parent: NET-74-0-0-0-0 NetType: Direct Allocation NameServer: NS1.SOFTLAYER.COM NameServer: NS2.SOFTLAYER.COM Comment: abuse@softlayer.com RegDate: 2007-05-16 Updated: 2007-11-14 RAbuseHandle: ABUSE1025-ARIN RAbuseName: Abuse RAbusePhone: +1-214-442-0605 RAbuseEmail: abuse@softlayer.com RNOCHandle: IPADM258-ARIN RNOCName: IP Admin RNOCPhone: +1-214-442-0600 RNOCEmail: ipadmin@softlayer.com RTechHandle: IPADM258-ARIN RTechName: IP Admin RTechPhone: +1-214-442-0600 RTechEmail: ipadmin@softlayer.com OrgAbuseHandle: ABUSE1025-ARIN OrgAbuseName: Abuse OrgAbusePhone: +1-214-442-0605 OrgAbuseEmail: abuse@softlayer.com OrgTechHandle: IPADM258-ARIN OrgTechName: IP Admin OrgTechPhone: +1-214-442-0600 OrgTechEmail: ipadmin@softlayer.com # ARIN WHOIS database, last updated 2009-07-23 20:00 # Enter ? for additional hints on searching ARIN's WHOIS database. Found a referral to rwhois.softlayer.com:4321. %rwhois V-1.5:003fff:00 rwhois.softlayer.com (by Network Solutions, Inc. V-1.5.9.5) network:Class-Name:network network:ID:NETBLK-SOFTLAYER.74.86.32.0/19 network:Auth-Area:74.86.32.0/19 network:Network-Name:SOFTLAYER-74.86.32.0 network:IP-Network:74.86.48.96/29 network:IP-Network-Block:74.86.48.96-74.86.48.103 network:Organization;I:SoftLayer Technologies, Inc. network:Street-Address:1950 Stemmons Freeway Suite 2043 network:City:Dallas network:State:TX network:Postal-Code:75207 network:Country-Code:US network:Tech-Contact;I:sysadmins@softlayer.com network:Abuse-Contact;I:abuse@softlayer.com network:Admin-Contact;I:IPADM258-ARIN network:Created:20070708 network:Updated:20071205 network:Updated-By:ipadmin@softlayer.com %referral rwhois://root.rwhois.net:4321/auth-area=. %ok
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