Sub Domain Names - Codewalkers

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March 28th, 2008, 07:41 PM

Dysan

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php5 - Sub Domain Names

Hi, I'm intrigued to find out how the URL's on eBay work. The main domain name for eBay is: www.ebay.co.uk, but the signup page is www.signup.ebay.co.uk. How are the www.signup.ebay.co.uk (Sub domains) created?

March 29th, 2008, 06:59 PM

Andrew

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These are often created as a combination of DNS records (a CNAME record which points to an IP address), then an apache VHOST is usually setup for the subdomain (so that when a request comes to the IP from that subdomain it is mapped to the correct location).

Check out Apache Documentation, there are other ways to do subdomains such as wildcarding, check out the Apache Server Documentation...

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April 1st, 2008, 04:20 AM

JohnFrank

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Quote:

Originally Posted by Dysan

This is also done at the DNS level where a domain name is hosted. You create record entries for your sub-domains and point them to the IP address serving that subdomain. This allows you to create geographies under your domain going to different IP's or to spread the load for different functions under the domain name to different IP's.

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