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welcome “ DYNAMIC DOMAIN NAME SYSTEM ” presented by: soni kumari
Contents Domain name system Services provide by DNS Dynamic domain name system Why we use DDNS Application of DDNS Limitation of IP solution How can I impl. DDNS 1 2 3 6 7 5 4 8
DOMAIN NAME SYSTEM <ul><li>DNS is an Internet Engineering Task Force (IETF) standard name service that allows your computer to register and resolve domain names. </li></ul><ul><li>The DNS makes it possible to assign domain names to organizations independent of the routing of the numerical IP address. </li></ul><ul><li>In other words, DNS is a system that translates domain names into IP addresses. </li></ul>
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DYNAMIC DOMAIN NAME SYSTEM <ul><li>Dynamic DNS is a technology that allows you to update the IP address of a domain in real time. </li></ul><ul><li>Dynamic DNS makes it possible for people and other websites to connect to a particular server without having to track that server's IP address. </li></ul>
Continue ….. <ul><li>The DNS master file must be updated dynamically. The Dynamic Domain Name System (DDNS) therefore was devised to respond to this need. In DDNS, when a binding between a name and an address is determined, the information is sent, usually by DHCP to a primary DNS server. The primary server updates the zone. The secondary servers are notified either actively or passively. </li></ul>
Application of DDNS <ul><li>DNS is its use in conjunction with DHCP, the Dynamic Host Configuration Protocol. </li></ul><ul><li>Dynamic DNS is to provide static host names for dialup customers of ISPs. </li></ul>
Why we use DDNS? <ul><li> A dedicated server usually runs DNS with a static IP address. It would be a problem if Google's IP address changed constantly. </li></ul><ul><li>An extra service runs on the host machine and monitors the IP Address. </li></ul><ul><li>When it changes, the Dynamic DNS service automatically takes notice, and updates the DNS record on the DNS server. </li></ul>
How can DDNS be used Today? <ul><li>BIND-8, released by the Internet Software Consortium in May of 1997, includes some support for Dynamic DNS as specified in RFC2136. </li></ul><ul><li>It does not currently include the authentication mechanism that is described in RFC2137, however, meaning that any update requests received from allowed hosts will be honored. </li></ul>
How Can I Implement Dynamic DNS? <ul><li>A server operator can implement Dynamic DNS on nearly any computer server with a minimum of setup requirements. </li></ul><ul><li>All one must do is simply change the maximum caching time, or the time intervals between caching of a domain, to a very short period. </li></ul>
The Limitations of Working with Dynamic IP Addresses <ul><li>This results in the following problems: </li></ul><ul><li>It is not possible to create a fully meshed VPN community with dynamic IP gateways, since gateways will not know how to reach each other. </li></ul><ul><li>The gateway’s owner cannot run public Web servers. </li></ul><ul><li>Remote Access VPN users cannot connect to the gateway’s Remote Access VPN Server. </li></ul>
The Dynamic DNS Solution <ul><li>Dynamic DNS (DDNS) solves this problem by allowing you to assign a domain name to a gateway with a dynamic IP address. </li></ul><ul><li>It is possible to create a fully meshed VPN community between all dynamic IP gateways, based on the DDNS information. </li></ul><ul><li>External users are able to access a Web server behind the gateway, using the DNS </li></ul>