DSL and NAT'ed customer addresses

[Hanasaki JiJi]

NAT

MyLinuxBox(ip=ip1) <== NATer ==> outside world (ip=ip2)

dyndns does a great job for dynamically assigned/changing IPs but how 
does it help when the insideIP!=outsideIP?

Jason Clinton wrote:
> Hanasaki JiJi wrote:
> 
>> Any thoughts on how he might run a server that can have connections 
>> initiated to it from anywhere on the net?
>>
> 
> If he's behind a NAT he needs two things:
> 
> 1. The ability to update the IP address of the router to a dyndns 
> service like dyndns.org so that no matter what his IP address is at any 
> given time, you can still find it from outside his NAT.
> 
> 2. The NAT needs to be able to 'port forward' the port the particular 
> server would run on. IE: port 80 for HTTP, 21 FTP, 22 SSH, 23 Telnet, 25 
> SMTP.
> 
> If you have the ability to let people know you're running on some odd 
> ports then you'll be better capable of avoiding your ISP's probes for 
> users running service (which is a violation of most end user 
> agreements). In the case of SMTP, you don't have a choice because all 
> SMTP servers look at port 25. In the case of HTTP, however, you could 
> distribute a URL that contains the port number it in like this:
> 
> http://archemides.homeunix.org:8888/
> (i don't actually have an http server running here)
> 

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