Haha.. Baru Tahu Mengenai DNS

Salam semua,

Pada hari ini saya dengan rendah dirinya mengaku bahawa saya bukanlah insan yang serba tahu mengenai DNS.. Hu2.. Sebelum ini saya ingatkan ia hanyalah Domain Name System sahaja, rupa-rupanya kita boleh manage DNS!

Untuk ape manage DNS?

Saya baru setup satu script yang membolehkan visitor create subdomain (subdomain.domain.com) percuma dalam http://nexg.biz dengan membenarkan sesiapa sahaja memendekkan URL laman web mereka yang panjang ke “anda.nexg.biz”. Pendek kata servis ni macam cjb.net dll. Dah berjaya tapi saya ada masalah dengan wildcarded DNS.

Apa itu wildcarded DNS?

Ia adalah satu sistem di mana apabila sesiapa tersalah type subdomain yang tak wujud dalam domain, maka visitor akan direct ke page yang kita tetapkan. Maknanya visitor tak akan tersesat. Ciri ini diperlukan utk setup servis subdomain yang saya kata tadi. Masalahnya sekarang, Domain name provider untuk nexg.biz tidak mempunyai feature managed DNS.

Kenapa tiada manage DNS?

Kerana domain yang saya beli itu hanyalah domain yang murah dan harganya hanya RM32 setahun. Tiada fungsi DNS Management,Domain forwarder dan Email Forwarder! Awas dan hati-hatilah dalam memilih domain! Kemudian saya nampak function itu terpaksa dibeli dengan harga RM20! Wow! Maknanya domain saya akan jadi RM52 setahun! Murah ke kalau harga begitu tapi tiada banyak function?

Kenapa harga domain berbeza?

Saya lihat ada domain yang RM50, RM40, RM36, RM39.. Kenapa ya?

Kerana mereka menawarkan function domain yang berbeza.

Jadi jika anda hanya mahukan domain name untuk alamat web anda, cukup sekadar harga yang murah dan tiada function lain. Tapi dalam kes saya, saya terpaksa cari provider yang tawarkan function tersebut pada harga yang murah.

Jadilah pengguna yang bijak. Bandingkan harga dan fungsi sebelum membeli =)

Berikut adalah sedikit penjelasan mengenai wildcard DNS dan Fungsi Managed DNS:

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A wildcard DNS record is a catch all record in a DNS zone that will match all non-existent requests for a domain name. Just like whenever you setup “catch all” or “nobody” email account, that will act as a “catch-all” account for any non-specified or misspelled username, as long as the domain name is correct. Then you will be able to retrieve these messages at the mail account you specify. So Wildcard DNS is just like that but is used on domain aliases of host name. On another wold you can also call it as Catch all Sub domains.

For example I have setup Wildcard DNS on domain zeroarticles.info, I have not created any subdomain/aliases on that domain. So if someone visits profile.zeroarticles.info the wildcard will forward that user to www.zeroarticles.info, same thing applied on test.zeroarticles.info, abc.profile.zeroarticles.info

That means everything which comes as domain aliases will be forwarded to www.zeroarticles.info, so we can technically call that *.zeroarticles.info will forward to host name.==================================

The Managed DNS Services includes:

• Easy-to-use Web based Interface for DNS Management
  More than 90% of the web hosting companies worldwide do not provide you with an interface to manage your own DNS Records. With each of our hosting package you have the ability to add and manage up to 100 records for FREE! using our powerful yet easy-to-use web based UI.
• Total Control over SOA, A, MX, CNAME, NS records and TTL
  You can add, modify, delete all types of records through the web based interface. All additions and modifications will reflect instantly on every DNS server. You can even set and change TTL on a per record basis, and modify all the SOA parameters.
• ZERO propagation delay for any additions or updates
  Our DNS servers use a custom version of BIND which allows any zone additions or modifications to reflect immediately across all our DNS Servers without requiring any restarts. The propagation time for any DNS changes is thus zero.
• Geographically distributed cluster of servers in world-class facilities geared to deliver 100% DNS uptime
  Research and studies show that a lot of hosting companies tend to distribute their DNS servers poorly mainly due to lack of resources, planning and expertise. A study conducted by Men & Mice of five thousand randomly selected .com domains showed that 38% of tested zones were located in one subnet, thus increasing significantly the risk of downtime due to a single point of failure. DNS downtime can bring down a companies website or email for up to 48 hours even after the service comes up due to caching practises of ISP’s.Our distributed DNS architecture is built by subject-matter experts after a lot of careful planning and comprises of n+1 servers, spread across data centers in different geographies, ensuring that there is NO single point of failure.
• Support for round robin DNS
  Round-robin DNS is a load balancing technique by which the balance power is placed in the DNS server. For example, suppose a company has three identical web sites hosted on three different servers. The company can enable round-robin DNS so that when a user accesses the website he/she will be sent to the first server (first IP Address), the second user who accesses the website will be sent to the next server (second IP Address), the third user to the third server (third IP Address), and the fourth user, will be sent to the first server as the end of the list has been reached.Round robin DNS is usually used for balancing the load of geographically distributed web servers along with other forms of load balancing and clustering.
• 24×7 Monitoring
  All DNS servers and services are monitored by us 24 x 7. Our centralized notification system ensures that any issues are immediately brought to the notice of the people incharge and our processes ensure that the downtime of any service and server is reduced to the minimal possible extent. As such, due to our DNS architecture and design, it would take multiple simultaneous failures for the service to deteriorate or stop functioning.

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