Only access to certain IP ranges

[ErikJan]

I would like to configure Firefox (older version which I don't want to update for certain reasons) to have access ONLY to a few pre-set IP-address ranges.

Can this be done? How?

[HansV]

Perhaps the following:
- Select Tools > Options...
- Click Advanced.
- Activate the Network tab.
- Click Settings...
- Select 'Manual proxy configuration'.
- Set the HTTP proxy to 127.0.0.1. This is your own computer, so it will effectively block all internet access.
- Enter the ranges you want to allow in the 'No proxy for' box (remove 127.0.0.1 from this box).

Use CIDR notation for the IP ranges. For example, to allow all IP addresses beginning with 12.116.48, enter 12.116.48.0/24 - this specifies that the first 24 bits = 3 bytes are fixed, while the remaining 8 bits = 1 byte can be anything.

To lock down Firefox settings, see Locking preferences.

[ErikJan]

Doesn't appear to work... The range I included works but others still do too.

Is this what you meant?

2015-05-22 15_48_48-Connection Settings.png

[StuartR]

That's strange. Can you try changing the Port number for the proxy from 0 to another number, for example 80

[HansV]

Yes, that's what I meant, but if it doesn't work, I cannot offer further help. Sorry.

[ErikJan]

Tried that... no difference...

[Claude]

Depending on what modem you have, you may be able to setup the restrictions in the modem.

[StuartR]

I just tested this Firefox setting on my PC (Windows 7, Firefox 28.0.1) and it works as expected. Please go back and double check the settings as this makes little sense.

[ErikJan]

Depending on what modem you have, you may be able to setup the restrictions in the modem.

I'm trying this @ work... there's no modems there ;-)

[Claude]

I see, that's complicated the situation ;(

[ErikJan]

I just tested this Firefox setting on my PC (Windows 7, Firefox 28.0.1) and it works as expected. Please go back and double check the settings as this makes little sense.

For certain reasons I have to use an older version of FireFox. To make the process easy, I was also trying to use an approach where no install would be required and where I could pre-set certain conditions (like the IP address ranges). I did find a portable FireFox install set here http://portableapps.com/firefoxportable and that one uses FireFox 3.6.6...
Maybe that could be the reason why I cannot make this work?

[ErikJan]

I just tested this Firefox setting on my PC (Windows 7, Firefox 28.0.1) and it works as expected. Please go back and double check the settings as this makes little sense.

I tested this with v28 but also there it does not seem to work...

2015-05-26 09_00_35-Clipboard.png

Let's suppose my IP address was 123.456.789.123, then I'd enter in the "No Proxy for" box: 123.456.0.0/16 right?
So if I would then try to access 124.111.222.333 I should NOT be able to do that, correct? Because in my case I DO have access there!

[jonwallace]

Disclaimer: I don't really know what I'm talking about.

But do you need to check the box marked "Use this proxy server for all protocols"?

[StuartR]

...
Let's suppose my IP address was 123.456.789.123, then I'd enter in the "No Proxy for" box: 123.456.0.0/16 right?
So if I would then try to access 124.111.222.333 I should NOT be able to do that, correct? Because in my case I DO have access there!

Try with absolutely nothing in the "No proxy for:" box first to see what that does.
It might be confused because 127.0.0.1 is your local PC, it leads to the same place as 123.456.789.123

...do you need to check the box marked "Use this proxy server for all protocols"?

This won't affect the ability to access web sites, it is for other protocols, not http

[ErikJan]

You are right, if I leave the "No Proxy For" box empty, I still can access everything... Now what?

[StuartR]

This makes no sense to me. That proxy setting should prevent any web browser access from working as your PC should send all web requests to the local PC instead of to the internet.

[ErikJan]

127.0.0.1 as Proxy and the rest empty still allows me to go anywhere... e.g. google.com. What are we missing?

[StuartR]

Sorry, this is beyond me. When I configure Firefox 38.0.1 like this then I can't access any web sites...

Proxy Settings.jpg

My only remaining suggestions are that you install the latest version of Firefox, or you try a different browser.