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I get one domain name from my hosting comany like ehfabc.com and
found out its IP is 212.1.213.70 on whois domaintool website
and found its name server called ns1.ehfabc.com and its
IP( ns1.ehfabc.com) is also 212.1.213.70

SO I go to chrome or FF to see what is web page output
when I type 212.1.213.70, the web output is diferent  from I type e-hftrade.com
Why ?

I mean
when I type ehfabc.com , it will go to my index.php web page at my server's public_html directory
When I try  212.1213.70, it will go to http://212.1.213.70/cgi-sys/defaultwebpage.cgi
When I try  ns1.ehfabc.com(nameserver of ehfabc.com), it will also go to http://212.1.213.78/cgi-sys/defaultwebpage.cgi

How ehfabc.com and 212.1.213.70  address can go to different web output ?
I guess only under one condition that will happen, the IP is reported from one of  ehfabc.com(212.1.213.70) and its name server ns1.ehfabc.com(212.213.70) wrongly

And I thought port forwarding can NOT create the same IP from domain name and its nameserver

And I go to check the file at /etc/resolv.conf, there is only one line output such as

nameserver 8.8.8.8  

 and found nothing in resolv.conf file  about my nameserver, ns1.ehfabc.com

8.8.8.8 that is Google public DNS server

Please advise, why that strange thing is happend unless explaination from one of IP is wrong

DUncan

the ip address leads to the same socket as the name, and is read by the same software.

in name based virtual hosting, the server selects the content based on the HOST HTTP header sent by the client. a browser will always connect to the IP and send a HOST header corresponding to the contents of the address bar.

if you want to experiment with this, you can use "modify headers" FF extension and change the HOST header to whatever you want while using the IP in the address bar. if you set the host header properly, you should be able to browse your site using the IP

as a side note, doing name based virtual hosting when you host a single web site is useless at best

That sounds like Name-based instead of IP-based hosting.  With IP-based hosting, each site get it's own IP address.  In Name-based hosting, every site on the server has the same IP address and a 'name server' on that machine routes the requests by name to the correct site.  The IP address actually only leads to the name server on the machine.

http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/b77cf015-017f-489c-9b5b-65ca4a679392.mspx?mfr=true

Every Web site has a descriptive name, and can support one or more host header names. Organizations that host multiple Web sites on a single server often use host headers because this method enables them to create multiple Web site identities without using a unique IP address for each site.

The browser sends the URL of the site you want to visit with the request, that is why the server knows which website to present.