RE: No-IP and Real VNC on multiple PC's‏

[Philip Herlihy]

My understanding of NAT is that a router must be able to associate multiple connections (possibly connectionless UDP conversations) between its LAN clients and external stations which can see only the router as a single entity.  So, if a UDP datagram arrives from a station on the WAN the router must be able to “remember” which of its clients it should be sent to.

 

Port forwarding is a fixed configuration, where a connection on a particular port (e.g. 5900 or 5500) is always routed to a particular client.  The most helpful routers allow the port to be translated, so you can connect to the router on port 8903 or port 8904 and the router will send the connection to 10.0.0.3 or 10.0.0.4 respectively, while translating the port on the LAN side to 5900.

 

Caveat: I’m no networking guru!

 


Philip Herlihy

		
		
		
		

 

From: Dale Eshelman [mailto:eshelmand at gmail.com] 
Sent: 27 September 2009 00:44
To: Philip Herlihy
Cc: vnc-list at realvnc.com
Subject: Re: No-IP and Real VNC on multiple PC's‏

 

I am familiar with the link. I just thought there was something special you were addressing I did not know. I do not know a router that does not have port forwarding.

I just thought the term "NAT" referenced something special regarding routers. So I guess "Net Address Translation" is the same as port forwarding.

 

On Sep 26, 2009, at 05:09 AM, Philip Herlihy wrote:





You may find this helpful:

http://portforward.com/

Philip Herlihy  


-----Original Message-----
From: vnc-list-bounces at realvnc.com [mailto:vnc-list-bounces at realvnc.com] On
Behalf Of Dale Eshelman
Sent: 26 September 2009 02:55
To: Christopher Woods
Cc: 'Bob Grabbe'; vnc-list at realvnc.com
Subject: Re: No-IP and Real VNC on multiple PC's‏

Can you provide an example of of the setting and location of setting  
on the router that need to take place for NAT? What must a router have  
in the settings to be a NAT router?
Thanks

On Sep 25, 2009, at 12:28 PM, Christopher Woods wrote:




 

I've done this before, although only with two pc's behind the

same router.

For example, the router is set up to forward port 5900 to

pc1, with the ip of 192.168.1.50 and port 5901 to pc 2 with

the ip of 192.168.1.51.

PC1 is set in vnc to listen on port 5900 and pc2 is set to

listen on port 5901. You set this on the connections tab of

the options for the vnc server on each pc.

If I want to connect to pc1, I run the vnc client ( from work

) to the No-ip address:5900, if I want to connect to pc2,

it's the No-ip address:5901.

 

With a good NATting router, having to change the listen ports on  

each PC

*shouldn't* be necessary, but it can make things simpler. (however  

if you're

connecting from those machines via a LAN it adds the requirement to  

specify

the port as well, which I dislike...)

 

If the 2Wire can only directly map incoming traffic to the  

equivalent port

on the internal machine, then Roberto will have to do that. As long  

as his

router supports restricted or full cone NAT and allows for differing  

local

and remote port assignments, he should only have to make his changes  

on the

router (all the LAN PCs will quite happily work with the default  

settings).

 

 

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Dale Eshelman
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The closer I get to the pain of glass in Windoz, the farther I can see  
and I see a Mac on the horizon.

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To remove yourself from the list visit:
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Dale Eshelman

eshelmand at gmail.com

 

ShopToEarn (Dist ID 105985)

 http://www.ShopToEarn.net/DaleEshelman <http://www.ShopToEarn.net/Eshelman> 

MonaVie (Distr ID 1316953)
http://www.monavie.com/Web/US/en/product_overview.dhtml

 

The closer I get to the pain of glass in Windoz, the farther I can see and I see a Mac on the horizon.