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Port Forwarding?



 
 
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  #1  
Old December 9th 17, 05:43 PM posted to alt.comp.hardware.pc-homebuilt
Davej
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Posts: 273
Default Port Forwarding?

So port forwarding only works with one computer? If you have two gaming computers then you are screwed? What am I not understanding?
  #2  
Old December 9th 17, 06:16 PM posted to alt.comp.hardware.pc-homebuilt
Paul[_28_]
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Posts: 1,467
Default Port Forwarding?

Davej wrote:
So port forwarding only works with one computer? If you have two gaming computers then you are screwed? What am I not understanding?


For the simplest home setup, with Port Forwarding
on the router, it might seem that way.

It depends on the flexibility of the server software.

Let's take web servers as an example.

Starbucks ---------- home_router --------- machine #1 (webserver:80)
\
\__________ machine #2 (webserver:8080)

I can start a webserver running, and instead of using
port 80 (the default), I can pick a high port number outside
of the 1024 reserved port numbers at the bottom
of the port space.

Web server software accepts alternate port numbers.

Now, when sitting at Starbucks, I type

http://davej.myname.com # reaches machine #1

http://davej.myname.com:8080 # reaches machine #2

There are some other protocols, which accept a small
"range" of port numbers. For example, Xservers start
at 6000, and 6001 would be :1, 6002 would be :2
and so on.

Starbucks ---------- home_router --------- machine #1 (Xserver:6000)
\
\__________ machine #2 (Xserver:6001)
DISPLAY=:0
DISPLAY=:1

Depending on the protocol, it may have been designed
for situations like this, or it might not.

And there are probably other ways to solve this
problem with static addresses on one home setup.
But usually the ISP charges a monthly fee for the
privilege.

The scheme doesn't appear to be infinitely extensible.
Only a small number of serving devices can be
satisfied with this "home user" concept.

I'm not an IT guy, and cannot answer this question for
every conceivable networking option. There are people
who will laugh at my examples, and deservedly so.

*******

And IPV6 doesn't use this scheme, at all.

If you switch to IPV6, things are *entirely* different
and a lot more dangerous. Part of the thrill of using
IPV6, is the "security by obscurity" and the inability
to scan the whole number space in a reasonable time.
When your ISP gives you an IPV6 address, you're basically
given a whole (huge) block of addresses, and this problem...
goes away. No more Port Forwarding. Every machine is
exposed and must be secured (patched up to date).

Paul
  #3  
Old December 9th 17, 06:26 PM posted to alt.comp.hardware.pc-homebuilt
Mr. Man-wai Chang
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Posts: 697
Default Port Forwarding?

On 10/12/2017 12:43 AM, Davej wrote:
So port forwarding only works with one computer? If you
have two gaming computers then you are screwed? What am
I not understanding?


You talking about server or players?

Port forwarding is only needed when you run a game server that must
answer incoming calls over the router.

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  #4  
Old December 9th 17, 08:23 PM posted to alt.comp.hardware.pc-homebuilt
NIl
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Posts: 73
Default Port Forwarding?

On 09 Dec 2017, Davej wrote in
alt.comp.hardware.pc-homebuilt:

So port forwarding only works with one computer? If you have two
gaming computers then you are screwed? What am I not
understanding?


If your game or application can be set up for different ports, you can
forward those various ports in your router to different computers.
  #5  
Old December 9th 17, 08:39 PM posted to alt.comp.hardware.pc-homebuilt
Davej
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Posts: 273
Default Port Forwarding?

On Saturday, December 9, 2017 at 1:23:51 PM UTC-6, Nil wrote:
On 09 Dec 2017, Davej wrote in
alt.comp.hardware.pc-homebuilt:

So port forwarding only works with one computer? If you have two
gaming computers then you are screwed? What am I not
understanding?


If your game or application can be set up for different ports, you can
forward those various ports in your router to different computers.


Is it possible I've been doing this for nothing?

https://support.steampowered.com/kb_...8571-GLVN-8711

Steam doesn't bother to explain anything.
  #6  
Old December 9th 17, 09:58 PM posted to alt.comp.hardware.pc-homebuilt
Paul[_28_]
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Posts: 1,467
Default Port Forwarding?

Davej wrote:
On Saturday, December 9, 2017 at 1:23:51 PM UTC-6, Nil wrote:
On 09 Dec 2017, Davej wrote in
alt.comp.hardware.pc-homebuilt:

So port forwarding only works with one computer? If you have two
gaming computers then you are screwed? What am I not
understanding?

If your game or application can be set up for different ports, you can
forward those various ports in your router to different computers.


Is it possible I've been doing this for nothing?

https://support.steampowered.com/kb_...8571-GLVN-8711

Steam doesn't bother to explain anything.


For a couple people here, it just works. Would they
be on IPV6 ? Nobody who got it working, seems to
mention any details at all.

https://techreport.com/forums/viewtopic.php?t=79503

Paul
  #7  
Old December 13th 17, 04:48 PM posted to alt.comp.hardware.pc-homebuilt
Davej
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Posts: 273
Default Port Forwarding?

On Saturday, December 9, 2017 at 2:58:05 PM UTC-6, Paul wrote:
Davej wrote:
On Saturday, December 9, 2017 at 1:23:51 PM UTC-6, Nil wrote:
On 09 Dec 2017, Davej wrote in
alt.comp.hardware.pc-homebuilt:

So port forwarding only works with one computer? If you have two
gaming computers then you are screwed? What am I not
understanding?
If your game or application can be set up for different ports, you can
forward those various ports in your router to different computers.


Is it possible I've been doing this for nothing?

https://support.steampowered.com/kb_...8571-GLVN-8711

Steam doesn't bother to explain anything.


For a couple people here, it just works. Would they
be on IPV6 ? Nobody who got it working, seems to
mention any details at all.

https://techreport.com/forums/viewtopic.php?t=79503

Paul


Yes, I am confused. Maybe IPV6 makes it unnecessary or maybe it never was necessary? The help page says "Steam Client" not "Steam Server" so I presumed it was necessary for all players.
 




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