DNS Problems in Networking

  Networks are networks. Despite best efforts to keep things smooth all the time every day, things happen. Here’s a look at some common network issues, some tips for quickly resolving them, and even better, how to prevent them from occurring again.

1. Duplicate IP Addresses
When two devices attempt to share a single IP, you see the dreaded “Address Already in Use” error — with no ability to access the network.

The Quick Fix: The blame for this often rests with your router’s default DHCP configuration. DHCP is probably trying to assign your new device an address at the beginning of your subnet, and another device may already occupy these low-numbered addresses with static IPs. If you’ve just introduced a new device or server to your network, it may have its own DHCP server. Simply disable the DHCP server on that device to restore sanity to your network.

The Preventive Measure: You can take one simple step to avoid IP conflicts by modifying your router’s configuration to begin assigning DHCP addresses near the top end of your subnet, leaving the lower addresses available for devices that require static IPs.

2. IP Address Exhaustion
To troubleshoot this issue, use the ipconfig command. If the workstation has assigned itself an IP address that begins with 169.x.x.x, it means that no IP address was available from the DHCP server.

The Quick Fix: Some users on cable internet might not have a local router, in which case IP addresses are assigned on a limited basis directly from your ISP. You have probably run out of allowed IP addresses from your ISP. The solution to this is to purchase either a standalone router or WiFi access point with an integrated router. This creates your own local pool of internal addresses, ensuring you won’t run out.

3. DNS Problems
Errors such as The Network Path Cannot Be Found, IP Address Could Not Be Found, or DNS Name Does Not Exist, can usually be traced to a DNS configuration issue. The command line utility nslookup can be used to quickly show a workstation’s DNS settings.

The Quick Fix: Workstations and other network devices can be configured to use their own DNS servers, ignoring the server assigned by DHCP. Checking the ‘Internet Protocol Version 4 (TCP/IP)’ settings for your adapter will show if an incorrect DNS server is specified, so just select “Obtain DNS server address automatically” instead.

find more : lm hash generator

Comments

Post a Comment

Popular posts from this blog

How to Change the Password on Microsoft Outlook

Microsoft Outlook is one of the most common business email clients. If you have recently begun work at a business that uses Microsoft Outlook, you may be wondering how to accomplish certain basic functions such as changing a password, as the menu option for doing so likely differs from the web mail account that you may be using at home. This article discusses the steps needed to change an email password in Microsoft Outlook. Step 1 Click "Tools" in Outlook, then click "Account Settings." Step 2 Click the "E-mail" tab if it is not already on top. Click the email account that you would like to change the password for, then click "Change." Step 3 Click inside the "Password" box, and type the new password for the email account. Click the "Remember password" box if you would like Outlook to remember your password. Step 4 Click the "More Settings" button if you a different password for your outgoing email serv
Read more

Common DNS Issues

  Running into an error with the Domain Name System — simply called a DNS error — means you won't be able to get access to the internet, which is frustrating if it happens regularly. Learning the most common causes of DNS issues and the best methods for fixing them can help you get back online with minimal effort. Essentially the DNS translates the domain names we use to access websites into IP addresses, which is what your computer actually uses to access the website. In most cases, a DNS problem is easy to fix Network Problems In many cases, an error attributed to DNS could be a simple connection problem (especially if you're connecting wirelessly using a laptop) that doesn't really relate to the DNS at all. Before blaming DNS errors, go to your "Network and Sharing Center" and run the troubleshooter. This will identify and fix many common connectivity issues and can help you narrow down the cause of the issue. Duplicate IP Addresses When two devices attempt to
Read more

How to disable SmartScreen in Windows 10 Creators Update

Windows 10 Creators Update introduced a number of changes to the user interface, so disabling Smart Screen can be a bit confusing. In this article, we'll see how to properly disable SmartScreen in it. The SmartScreen filter is a technology which was initially designed for Internet Explorer to protect users from malicious websites and web applications. It was integrated with IE8 and IE9 (as the successor to IE7's Phishing filter). Starting with Windows 8, Microsoft implemented Internet Explorer's SmartScreen feature directly into the operating system so files are screened for being potentially harmful. SmartScreen is also integrated for Windows Store apps. If enabled, the Windows SmartScreen filter sends information about every application you download and run to Microsoft’s servers, where that information will be analyzed and compared with their malicious apps database. If Windows gets a negative feedback about the app from the server, it will prevent you from running
Read more