basic port forwarding question

[The Torrent]

I need to forward these ports:

am i meant to fill in internal or external?

what do i put in the other?

 

thanks

[Retrodex Gaming]

Don't worry about internal ports. Unless you've set up an internal firewall they will all be open.

 

Make sure to open the ports in Windows Firewall (or alternative)!

[Windows7ge]

The port number can be changed when traversing networks. For this reason you have to specify the starting and ending range of ports on both interfaces.

[The Torrent]

2 minutes ago, Retrodex Gaming said:

Don't worry about internal ports. Unless you've set up an internal firewall they will all be open.

 

Make sure to open the ports in Windows Firewall (or alternative)!

i have to write something there tho? what do i write?

[The Torrent]

3 minutes ago, Retrodex Gaming said:

Don't worry about internal ports. Unless you've set up an internal firewall they will all be open.

 

Make sure to open the ports in Windows Firewall (or alternative)!

[Retrodex Gaming]

Just now, The Torrent said:

i have to write something there tho? what do i write?

Try it with the same port number! Can't hurt!

[The Torrent]

3 hours ago, Retrodex Gaming said:

Try it with the same port number! Can't hurt!

What about when its a range? it wont let me do the end value.

[Retrodex Gaming]

4 hours ago, The Torrent said:

What about when its a range? it wont let me do the end value.

Kinda shooting in the dark, what type of router is it?

[The Torrent]

16 hours ago, Retrodex Gaming said:

Kinda shooting in the dark, what type of router is it?

bt infinity

[Retrodex Gaming]

https://portforward.com/bt/home-hub-5/

 

There's the full process for a BT router!

[The Torrent]

3 hours ago, Retrodex Gaming said:

https://portforward.com/bt/home-hub-5/

 

There's the full process for a BT router!

it doesn't say about internal/external though.

[Retrodex Gaming]

3 hours ago, The Torrent said:

it doesn't say about internal/external though.

Looks like you have a HomeHub 6, which this guide covers, looks like it's 32400!

 

https://portforward.com/bt/home-hub-6/

[Alex Atkin UK]

That's odd, as you absolutely need the same port range in both.  Although worst case, you put them in one at a time and hope it lets you add that many entries.

[Jarsky]

This advice is horrible. 

 

 

OP, with this kind of router config, typically to forward ranges you only need to enter in the start port number for the Internal. 

So it would be "External Start 27015  External End 27030   Internal Start 27015. Because you've already specified a range, it auto calculates the Internal End to stop you trying to input an invalid number. 

 

Keep in mind your External can be different to your Internal. So if you were to do External 8000-8015, you could still do Internal 27015 which would still make the Internal end 27030. If you reverse that idea with External 27015-27030, and did Internal Start 8000, then the Internal End would be 8015.

 

In most cases you will match your internal to external ranges for simplicity but there may be security reasons (e.g SSH or RDP) or compatibility reasons (e.g multiple server instances) that you want to make these different. 

[The Torrent]

13 hours ago, Jarsky said:

This advice is horrible. 

 

 

OP, with this kind of router config, typically to forward ranges you only need to enter in the start port number for the Internal. 

So it would be "External Start 27015  External End 27030   Internal Start 27015. Because you've already specified a range, it auto calculates the Internal End to stop you trying to input an invalid number. 

 

Keep in mind your External can be different to your Internal. So if you were to do External 8000-8015, you could still do Internal 27015 which would still make the Internal end 27030. If you reverse that idea with External 27015-27030, and did Internal Start 8000, then the Internal End would be 8015.

 

In most cases you will match your internal to external ranges for simplicity but there may be security reasons (e.g SSH or RDP) or compatibility reasons (e.g multiple server instances) that you want to make these different. 

Ok so I get the first bit - for the range, set the start value as the start for the internal and it auto calculates. I don’t understand the second half as I am unable to edit the external end range so I can’t use it as 2 rules in 1 rule if I’m understanding correctly, but that’s not important.

 

great, thanks?

 

[Jarsky]

7 hours ago, The Torrent said:

Ok so I get the first bit - for the range, set the start value as the start for the internal and it auto calculates. I don’t understand the second half as I am unable to edit the external end range so I can’t use it as 2 rules in 1 rule if I’m understanding correctly, but that’s not important.

 

great, thanks?

 

 

You dont need to do the port remapping in most cases. 

 

What I was trying to explain, is that you may want to use nonstandard ports. If we use a single port as an example, if you wanted to open RDP, because bots from China, Iran, Russia, etc...are constantly scanning networks for open Port 3389 (RDP Port), you might want to make it something non standard like 4000. Now if you were to map port 4000 from external to port 4000 internal...because your RDP is running on port 3389 it doesnt work without changing the port your RDP works on. This is where the port remapping comes in. In this example your external port would be 4000, but internal would still be 3389, so by remapping the port you dont have to change any configuration on the server to have it run on a different port. This same concept can extend to port ranges as well.