DNS Scavenging setup & Understanding Aging and Scavenging, Windows 2000

What is Scavenging?
Most of you reading this will already know what DNS Scavenging is. For those of you that don’t it is a feature of Windows DNS servers which allows you to automate the deletion (scavenge) of outdated DNS resource records. It sounds simple enough and it is once you decipher Microsoft’s cryptic descriptions, but to the uninitiated it is just plain confusing and often leads to unpredictable results. This article will attempt to simplify how DNS scavenging works.

Windows 2000's DNS service supports the scavenging feature, which helps you ensure that DNS records managed by the service are up to date. Scavenging is particularly important if you use Dynamic DNS to automatically register client host names when their IP addresses change, as is often the case when the clients receive address assignments through DHCP.

Scavenging is set in three places on a Windows Server:

1. On the individual resource record to be scavenged.
2. On a zone to be scavenged.
3. At one or more servers performing scavenging. 

Enabling DNS Scavenging on Zones

The first thing we need to do is enable Scavenging. This is done separately for each DNS zone. To enable scavenging on all zones see “Enable Scavenging on All Zones” below. To enable scavenging right click the DNS zone, select properties and then on the general tab select the “ageing” button.

Tick the box “Scavenge Stale resource Records” and leave the rest to their defaults.
Here is where the confusion starts. The No-Refresh and Refresh Intervals are not when resource records get scavenged. They are timers for when DNS records become eligible for scavenging. The actual scavenging process is done elsewhere.

Enable Scavenging on All Zones

To enable scavenging for all zones right click the DNS server name and select “Set Ageing/Scavenging for all DNS zones”

It is important to point out that this will only enable scavenging on NEW zones. To apply it to existing zones tick the box (on next pop-up) that says “Apply these settings to the existing AD zones”.



DNS scavenging in Windows 2000
You can configure scavenging through a zone's properties.

1. Open the DNS console, right-click the zone, and choose Properties.
2. On the General tab, click Aging to open the Zone Aging/Scavenging Properties dialog box.
3. Set the Refresh Interval and the No-refresh Interval using the drop-down lists.
4. Select the Scavenge Stale Resource Records check box, and click OK to close both dialog boxes.

Thank you
Asraful islam.

Related Link of :

1. DNS Server Not Responding Error – How to Fix it

   1. Reverse DNS and IP Lookup

      • Error "Server Error in '/' Application.What does this mean?

        • what-is-sql-pronounced-ess-que

    

DNS Server Not Responding Error – How to Fix it

Reasons for getting DNS Server Not Responding Error

• The server which host the website might be temporarily down due to technical reasons
• The DNS service in your computer is corrupted or not working
• The security firewall or security software itself might have accidentally blocked your PC from communicating with a website or certain websites

How to narrow down the source of DNS server not Responding Error?

• If you have another computer or mobile device accessing internet from the same network, then check if they are able to access internet. The other mobile device can be a smart phone or tablet. If the other devices have internet connection, then this is an issue with your computer. If the other devices are not able to access internet, don’t waste any time and contact your ISP. Explain them the scenario and they will help. (Some ISP technicians are quick to blame your computer for this issue)

• Try to access internet using safe mode with networking. It is explained below under the section “How to fix DNS Server Not Responding Error because of a corrupted security”. If your computer is able to access internet in safe mode with networking, a security software or conflicting third party software might be responsible for the problem.
•  

 How to Fix 'Dns Server Not Responding'?

1. Click "Start", input "NCPA.CPL" (without quotation marks) and press Enter.

2. Right click on the connection that you use for the local connection, and then click "Properties".

3. Click to select "Internet Protocol Version 4 (TCP/IPv4)", and then click "Properties".



4. In the Internet Protocol window, let's change the "Preferred DNS server" to 208.67.222.222



5. Click 'OK' twice to complete the modification.



If the issue persists, please repeat the steps and change the "Preferred DNS server" to 208.67.220.220.



Meanwhile, I would appreciate your help in clarifying that if the network is based on a router or a DSL modem. If there is a router, please bypass it and connect to DSL modem directly for a test. 

 

  I suggest you perform the following steps to troubleshoot the issue.

1. Click "Start", input "NCPA.CPL" (without quotation marks) and press Enter.

2. Right click on the connection that you use for the local connection, and then click "Properties".

3. Click to select "Internet Protocol Version 4 (TCP/IPv4)", and then click "Properties".

4. In the Internet Protocol window, let's change the "Preferred DNS server" to 208.67.222.222

5. Click 'OK' twice to complete the modification.

If the issue persists, please repeat the steps and change the "Preferred DNS server" to 208.67.220.220.

Meanwhile, I would appreciate your help in clarifying that if the network is based on a router or a DSL modem. If there is a router, please bypass it and connect to DSL modem directly for a test.

Thanks,

Asraful islam

 

 

Reverse DNS and IP Lookup

DNS Lookup

What is this tool?

The domain name system (DNS) stores and associates many types of information with registered domain names (like dnsstuff.com). It also translates domain names to IP addresses and records the mail servers that accept mail for each domain. The DNS Lookup test performs a standard DNS lookup, and returns details about the specified record type(s) as well as additional useful information about the domain's DNS entries. Example: For the A record type, a DNS lookup provides information about how the domain or host name is resolved to an IP address (example, 192.168.1.1).

*To lookup a PTR record, be sure to populate the "enter domain or hostname" field in the proper format for a PTR record (i.e., ip_in_reverse_order.in-addr.arpa). You may find it easier to use our Reverse DNS Lookup tool to lookup PTR records.

How do the results help me?

• To Verify Your DNS Entries Typically, you'll use this tool to make sure that your DNS entries are correct (for example, making sure that the A record for your domain points to the IP address of your website).
• To Determine the Mail Servers for Particular Domain You might use this tool to find out what server(s) accept email for a specific domain (by doing an MX record lookup).
• To Determine Whether the Domain Restricts Who Can Send email You might use this tool to determine the SPF record for a domain (by looking up the TXT record for the domain), to see if the domain tries to restrict who can send email using the domain.
  

What Is 'Telnet'? What Does Telnet Do?

What Is 'Telnet'?
Telnet is a simple, text-based program that allows you to connect to another computer by using the Internet. If you've been granted the right to connect to that computer by that computer's owner or administrator, Telnet will allow you to enter commands used to access programs and services that are on the remote computer, as if you were sitting right in front of it. Telnet can be used for many things, including accessing e‑mail, databases, or files.
SSH is required to establish remote terminal connections to Indiana University's central systems. SSH is similar to telnet, but is far more secure

Telnet is a protocol that allows you to connect to remote computers (called hosts) over a TCP/IP network (such as the Internet). Using telnet client software on your computer, you can make a connection to a telnet server (i.e., the remote host). Once your telnet client establishes a connection to the remote host, your client becomes a virtual terminal, allowing you to communicate with the remote host from your computer.

You user to telnet in windows?

To open Telnet Client

• Open Telnet by clicking the Start button , typing Telnet in the Search box, and then clicking OK.
  
  

  Telnet commands

  The telnet commands allow you to communicate with a remote computer that is using the Telnet protocol. You can run telnet without parameters in order to enter the telnet context, indicated by the Telnet prompt (telnet>). From the Telnet prompt, use the following commands to manage a computer running Telnet Client.
  The tlntadmn commands allow you to remotely manage a computer running Telnet Server. These commands are run from the command prompt. Used without parameters, tlntadmn displays local server settings.
  To use telnet commands at the Telnet prompt
  
  
  
  
  
   

ARP (Address Resolution Protocol)

What is ARP (Address Resolution Protocol)?

Short for Address Resolution Protocol, a network layer protocol used to convert an IP address into a physical address (called a DLC address), such as an Ethernet address. A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP network. The host on the network that has the IP address in the request then replies with its physical hardware address.
ARP is used to convert an IP address to a physical address such as an Ethernet address

There is also Reverse ARP (RARP) which can be used by a host to discover its IP address. In this case, the host broadcasts its physical address and a RARP server replies with the host's IP address.

What is point-point link? Routing with point-to-point .

What is point-point link?

If the physical links are limited to a pair of nodes it is said to be point-point link.

 oint-to-point connections are typically used to connect two systems together over a wide area network (WAN). You can use a point-to-point connection to get data from your local system to a remote system or to get data from a local network to a remote network. Do not confuse point-to-point connections with Point-to-Point Protocol. Point-to-Point Protocol (PPP) is one type of a point-to-point connection that is commonly used to connect a computer to the Internet.

Point to Point Networks

This page describes using Air-Frame 10 and 100 models in point to point configurations.

Point to Point Network Diagram

 

Point to point networks are used to connect one location to one other location. The above diagram shows two connected multi-user networks (using a Hub or Switch). Either location (A or B) may be configured as a(without a Hub or Switch).

Satellite advantages from point to point links

- Independent of the existence or not of terrestrial networks
- Programmable carrier speeds
- Transparent circuits
- Elevated link reliability
- Costs unrelated to distances covered
- Possibility of booking in permanent or occasional mode according to needs

 

How to browse free internet using Grameen Phone SIM? USSD codes for EDGE Package activation.

How to browse free internet using Grameen Phone SIM:
Grameenphone offers the most affordable internet packages for handset browsing. You can easily connect to internet by availing any of the internet packages offered by Grameenphone

How to use free internet in a grameenphone sim? Have you ever think why you can use free internet in bangladesh. yes, you can. you can do this with gp sim in Bangladesh. you can download unlimited file from those proxy all you have to do the following things:

1. Go to configuaration in your nokia mobile

2. Go to personal configuaration settings

3. Add new configuration select web

4. Account name:any

5. Homepage:internet.grameenphone.com

6. Username:empty

7. Password:empty

8. Select pref. access pt. as NO

9. Go to access point settings

10. Turn proxy enable

11. Type any proxy from below

12. Use port as 80

13. Save it

14. Now go to mobile's main menu screne.

15. Then press 0 for sometime you will see a box in the middle then enter your expected webpage url in the url box.

16. Finally enjoy totaly free internet.

for good speed take P7,P9,P10 package.

proxy:
69.195.138.144-----------------------(Big file download)

216.155.153.105---------------------(Resume download--size limit 150 mb)

76.73.71.196-------------------------(Youtube video supported)

67.159.5.242-------------------------(SSl supported)

204.45.134.106----------------------(SSL supported)

USSD codes for EDGE Package activation:

• For New Pay as you go Dial *500*0#
• For Heavy Internet browsing Package P2 Dial *500*2*1#
• For Night Time Heavy Internet browsing Package P3 Dial *500*3*1#
• For Daily 150MB Package P4 Dial *500*4*1#
• For 3GB Package P5 Dial *500*5*1#
• For 1GB Package P6 Dial *500*6*1#
• For Minipack 25MB Dial *500*7*1#
• For Minipack 150MB Dial *500*9*1#
• For Minipack 9MB (with 3 FREE MMS) Dial *500*10*1#
• For Minipack 2MB (with 2 FREE MMS) Dial *500*11*1#


• To check EDGE subscription status and remaining volume, Dial *500*60#
• To activate auto renewal feature, Dial *500*41#
• To deactivate auto renew feature, Dial *500*42#
• To deactivate EDGE service, Dial *500*40#
• To get handset settings, Dial *500*50#

Configuring Network Address Translation, what you defined above

NAT Configuration:This document explains configuring Network Address Translation (NAT) on a Cisco router for use in common network scenarios. The target audience of this document is first time NAT users.

Note: In this document, when the internet, or an internet device is referred to, it means a device on any external network.

NAT can be configured in various ways. In the example below, the NAT router is configured to translate unregistered (inside, local) IP addresses, that reside on the private (inside) network, to registered IP addresses. This happens whenever a device on the inside with an unregistered address needs to communicate with the public (outside) network.

Configure NAT in order to accomplish what you defined above. Based on what you defined in step 2, you need determine which of the following features to use:

• Static NAT
  
• Dynamic NAT
  
• Overloading
  
• Any combination of the above
  
  More Related Site:
  
  
  1. virtual private network (VPN)
  2. Web -Server Configure
  3. Mac-address

 

virtual private network (VPN)

What is a virtual private network (VPN)?
VPN is pronounced as separate letters and is short for virtual private network.
A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or individual users with secure access to their organization's network. A virtual private network can be contrasted with an expensive system of owned or leased lines that can only be used by one organization. The goal of a VPN is to provide the organization with the same capabilities, but at a much lower cost.

 Today, the Internet is more accessible than ever before, and Internet service providers (ISPs) continue to develop faster and more reliable services at lower costs than leased lines. To take advantage of this, most businesses have replaced leased lines with new technologies that use Internet connections without sacrificing performance and security.

What is point-point link?

what is  point-point link?

 If the physical links are limited to a pair of nodes it is said to be point-point link.

1. On point-to-point links such as High-Level Data Link Control (HDLC) and Point-to-Point Protocol (PPP), Open Shortest Path First (OSPF) runs as a point-to-point network type. This network type is enabled by default. This document shows sample configurations for OSPF over a point-to-point link. The other network types that OSPF supports are Point to Multipoint, Broadcast, and Non-Broadcast.
2. Point-to-point connections are typically used to connect two systems together over a wide area network (WAN). You can use a point-to-point connection to get data from your local system to a remote system or to get data from a local network to a remote network. Do not confuse point-to-point connections with Point-to-Point Protocol. Point-to-Point Protocol (PPP) is one type of a point-to-point connection that is commonly used to connect a computer to the Internet.