Internet Connection Sharing and firewall rules


  1. Posts : 3
    Windows 10
       #1

    Internet Connection Sharing and firewall rules


    Hello,

    I've recently started using internet connection sharing between two network adapters on my desktop. However I noticed the adapter which the internet is being shared to is not respecting the firewall rules I have in place.. its bypassing all the set firewall rules.

    Is this intended behavior? Was a surprise to me..

    I would like to share my connection to a secondary adapter however I require it to respect the firewall rules I have in place.. I'm not entirely sure the simplest way to go about this.

    My end goal is to control the secondary adapters network access (specifically blocking certain IP addresses/ranges).. I really like the fact windows firewall allows me to punch in terminal commands to setup new rules with ease, which is why I have opted to go down this route (internet connection sharing).

    This is a home application, I own a router/modem combo supplied by the ISP which is very limited in its capability..

    Can anyone suggest a way I can force ICS to respect my firewall rules? or perhaps a alternative solution (preferably software route).

    Windows version number: 1903 (build 18362.1016)
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  2. Berton's Avatar
    Posts : 10,783
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #2

    I haven't used ICS since it was introduced with Win98 SE [Second Edition] and with Dial-up Modems and later with WinXP. With ICS wife's computer would try to access IE which in turn caused my computer with the Modem to do the dialing. Only downside was if I was downloading a file it limited the bandwidth and hers was slow, not a problem with services now available with each computer having their own access, Wired or Wireless/Wi-Fi through the Router/Modem. But check this page:
    How to Share Your Internet in Windows Using Ethernet or Wi-Fi | Tom's Hardware
    I think the "devices" means several computers, not one computer with two or more connections or maybe bridging would be appropriate but I've never used it.
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  3. Posts : 3
    Windows 10
    Thread Starter
       #3

    Berton said:
    I haven't used ICS since it was introduced with Win98 SE [Second Edition] and with Dial-up Modems and later with WinXP. With ICS wife's computer would try to access IE which in turn caused my computer with the Modem to do the dialing. Only downside was if I was downloading a file it limited the bandwidth and hers was slow, not a problem with services now available with each computer having their own access, Wired or Wireless/Wi-Fi through the Router/Modem. But check this page:
    How to Share Your Internet in Windows Using Ethernet or Wi-Fi | Tom's Hardware
    I think the "devices" means several computers, not one computer with two or more connections or maybe bridging would be appropriate but I've never used it.
    Thanks for the reply.

    That guide explains how to setup ICS, which I have done already.. my issue is that ICS is not respecting the firewall rules I have in place.

    I did try bridging the connections, same deal.. bypasses firewall rules.

    Supposedly this is intended behavior in windows 10 (ICS & bridged connections bypassing firewall rules) and was not the case in the Windows 7 implementation of ICS... which makes googling this issue really fun! (conflicting info everywhere!)
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  4. Berton's Avatar
    Posts : 10,783
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #4

    Press Windows Key + R, type winver and press Enter. Do you have the Pro or Home edition of Win10 [could be an issue]?
    Internet Connection Sharing and firewall rules-image.png
      My Computers


  5. Posts : 3
    Windows 10
    Thread Starter
       #5

    Berton said:
    Press Windows Key + R, type winver and press Enter. Do you have the Pro or Home edition of Win10 [could be an issue]?
    Internet Connection Sharing and firewall rules-image.png

    Pro.
      My Computer


 

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