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On Wed, Feb 13, 2019 at 08:42:10AM -0800, simon.new...@gmail.com wrote:
> In 3, if i clicked on "block connections" in the Qubes manager firewall 
> section, there was (if memory serves me) an option to block DNS and ICMP. 
> 
> That is not present in R4 (though docs say you can disable DNS and ICMP 
> manually)
> 
> I'm just wondering what the logic behind the removal was? I would have 
> thought that a general user who clicks "block connections" on Qube would not 
> expect the qube to be able to actually send out and receive network packets 
> such as DNS or ICMP. This presents information leakage scenarios (default DNS 
> lookups of given qube) and also potential egress vectors if a qube is ever 
> compromised (DNS tunnelling, ICMP tunnelling). 

Let me quote full text you can find on firewall tab there:

    NOTE: To block all network access, set Networking to (none) on the
    Basic settings tab. This tab provides a very simplified firewall
    configuration. All DNS requests and ICMP (pings) will be allowed. For
    more granular control, use the command line tool qvm-firewall.

There is clear message what to do if you want to cut the qube from the
network.

- -- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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