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I've only experience in pointing a domain name to an IP address,

but never knows how do I point WAN IP address to a specific machine?

You can talk about it in either windows or linux,that's fine.

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please explain your questions better. More information is required so we may help answer your Q. – Felipe Alvarez May 23 '10 at 16:50

3 Answers

up vote 1 down vote
  1. Call your ISP
  2. Tell them you an additional IP address on your connection
  3. ???
  4. Profit
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Not clear from your question, but i think what you want is called multihoming.

its trivial in linux. never tried it in windows, but it cant be that difficult.

http://en.wikipedia.org/wiki/Multihoming

Linux (from the wiki article): http://tetro.net/misc/multilink.html

Windows (again, from the wiki article): http://web.archive.org/web/20070204050951/http://www.uit.co.uk/practical-tcpip/w-ipaliasw.pdf

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Yes it's close,but it has to do with the ISP,right?Say,we as end users can't assign any IP to ourselves without authorization. – apache May 23 '10 at 23:47
no, generally you cant just assign yourself an IP. if youre getting into multipath routing to an ISP, thats exponentially more difficult than multihoming. – Devnull May 25 '10 at 19:59
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Generally, if I understand you correctly, the simple way to do this is NAT. You just give the machine a private IP, and then on your router you NAT the specific WAN ip (and maybe port) to the internal IP.

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