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Re: PHP socket and NAT [message #177154 is a reply to message #177151]

Fri, 24 February 2012 13:22

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

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...

> /Str.

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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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