DSL and NAT'ed customer addresses

[Hanasaki JiJi]

Ah.. ya missed a key thing.  He isn't doing the NAT.  The DSL provider 
is NAT'ing AND there are multiple internal IPs on a single externalIP.

Joshua Bergland wrote:
> I am using ddclient as my dyndns client, and it has an option in its 
> configuration file to have it use 'web based IP detection' ... it 
> checked the information returned by http://checkip.dyndns.org and then 
> uses that to set the ip address for your chosen domain :-)
> 
> Make sure to set it to only change your dyndns settings at the dyndns 
> only if your ip address changes, as doing it more frequently is 
> considered abuse according to dyndns.org
> 
> http://clients.dyndns.org/unix.php?service=dyndns
> 
> Just my two cents,
> Josh
> 
> Hanasaki JiJi wrote:
> 
>> 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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