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Re: PHP socket and NAT [message #177159 is a reply to message #177154]

Fri, 24 February 2012 14:20

Tim Streater
Messages: 328
Registered: September 2010

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Senior Member

In article <ji82v9$jsa$2(at)news(dot)albasani(dot)net>,
The Natural Philosopher <tnp(at)invalid(dot)invalid> wrote:

> M. Strobel wrote:
>> Am 23.02.2012 17:03, schrieb SL:
>>>> No they don't, the local network will not allow it. They will have
>>>> different IP addresses.
>>> Sorry, folks. When I say same IP, I mean the external IP.
>>>
>>> I am trying to add something to a chat application; a server is involved
>>> here, eg user initiates connection to a chat server (via internet), where
>>> the server routes the messages (I think you gurus know what I mean).
>>>
>>> Thanks.
>>>
>>>
>>
>> In the case where the clients connect to the server, there is absolutely no
>> problem
>> with NAT, it is just transparent. The server responds to these connections
>> like to
>> any other. Remember: HTTP establishes a TCP connection, and here the
>> endpoints (=
>> sockets) are identified by ip-address and port number: IP address in the IP
>> header,
>> port number in the TCP header.
>>
>> A problem with NAT is to start a connection from the internet to a station
>> on the LAN
>> through the NAT router. Many call this problem a security feature.
>>
>
> Probably because that is exactly what it is.
>
> All arising out of the perception that SEVERS need connections but
> DESKTOPS only make them.
>
> Plus a global shortage of IP addresses...

Until v6 at any rate - not that you hear ISPs talking about that.

--
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted" -- Bill of Rights 1689

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[Message index]

		PHP socket and NAT By: SL on Thu, 23 February 2012 08:58
		Re: PHP socket and NAT By: Erwin Moller on Thu, 23 February 2012 10:32
		Re: PHP socket and NAT By: Captain Paralytic on Thu, 23 February 2012 10:41
		Re: PHP socket and NAT By: Erwin Moller on Thu, 23 February 2012 10:53
		Re: PHP socket and NAT By: Erwin Moller on Thu, 23 February 2012 10:52
		Re: PHP socket and NAT By: SL on Thu, 23 February 2012 13:04
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 13:37
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 11:40
		Re: PHP socket and NAT By: Jerry Stuckle on Thu, 23 February 2012 13:00
		Re: PHP socket and NAT By: SL on Thu, 23 February 2012 13:09
		Re: PHP socket and NAT By: Captain Paralytic on Thu, 23 February 2012 13:19
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 13:53
		Re: PHP socket and NAT By: Captain Paralytic on Thu, 23 February 2012 14:25
		Re: PHP socket and NAT By: Michael Fesser on Thu, 23 February 2012 17:28
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 20:42
		Re: PHP socket and NAT By: M. Strobel on Fri, 24 February 2012 10:58
		Re: PHP socket and NAT By: SL on Thu, 23 February 2012 16:03
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 20:44
		Re: PHP socket and NAT By: M. Strobel on Fri, 24 February 2012 11:07
		Re: PHP socket and NAT By: The Natural Philosoph on Fri, 24 February 2012 13:22
		Re: PHP socket and NAT By: Tim Streater on Fri, 24 February 2012 14:20
		Re: PHP socket and NAT By: The Natural Philosoph on Fri, 24 February 2012 15:39
		Re: PHP socket and NAT By: Tim Streater on Fri, 24 February 2012 18:53
		Re: PHP socket and NAT By: The Natural Philosoph on Fri, 24 February 2012 21:04
		Re: PHP socket and NAT By: Tim Streater on Fri, 24 February 2012 21:41
		Re: PHP socket and NAT By: Peter H. Coffin on Sun, 26 February 2012 18:50
		Re: PHP socket and NAT By: Erwin Moller on Thu, 23 February 2012 13:37
		Re: PHP socket and NAT By: The Natural Philosoph on Thu, 23 February 2012 13:50

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