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Whonix-Gateway System DNS

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DNS on Whonix-Gateway ™[edit]

Introduction[edit]

System DNS here is defined as:

  • resolving DNS,
    • without use of a socksifier such as torsocks,
    • without application proxy settings,
    • without a Tor SocksPort.
  • using the usual mechanisms on Linux for resolving DNS.
  • that are usually configured through configuration file /etc/resolv.conf.
  • that would happen when running nslookup.

All traffic originating from Whonix-Workstation ™ and Whonix-Gateway ™ is routed over Tor. [1] [2] [3] [4]

Whonix-Workstation ™ is configured to use various SocksPorts [archive], DNSPort [archive] and TransPort [archive], see also Stream Isolation. Using system DNS on Whonix-Workstation ™ by default does not require Whonix-Gateway ™ system DNS. [5] Modifications of /etc/resolv.conf on Whonix-Gateway ™ have no effect on Whonix-Workstation ™.

Whonix-Gateway ™ is only configured to use various SocksPorts. A global system DNS resolver to resolve DNS originating from applications running on Whonix-Gateway ™ is not required for any common use case to justify enabling it by default. Use cases where this could be useful include:

  • resolving the hostname of a proxy used in /usr/local/etc/torrc.d/50_user.conf through Tor would be useful (technical explanation [archive])
  • resolving the hostname of a VPN. But then using a VPN configuration using IPs only would be better.
  • Perhaps we could use /etc/hosts for such use cases rather than enabling system DNS?

How[edit]

Advanced users only!
Usually recommended against and unnecessary.

Working. Using Whonix-Gateway ™ user clearnet.

Whonix ™ first time users warning Using the clearnet user, traffic will be sent over normal internet! Not over Tor! Will not be anonymous!

Disable /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate by making it no longer executable so DHCP will write to /etc/resolv.conf. The following command only applies to older versions of Whonix or those who have package anon-gw-dhcp-conf installed.

sudo chmod -x /etc/dhcp/dhclient-enter-hooks.d/nodnsupdate

Make /etc/resolv.conf mutable. Don't worry if the next command causes an error. It's not required anymore in recent Whonix ™ versions.

sudo chattr -i /etc/resolv.conf

Delete /etc/resolv.conf so we can regenerate it.

sudo rm /etc/resolv.conf

Restart networking.

sudo service networking restart

Login as user clearnet.

sudo su clearnet

Test it, for example using ping.

ping google.com

See Also[edit]

Footnotes[edit]

  1. Since Whonix 0.2.1, Whonix-Gateway ™ traffic is also routed over Tor. In this way, use of Whonix is hidden from persons or systems observing the network.
  2. To preserve the anonymity of a user's Whonix-Workstation ™ activities, it is not necessary to torify Whonix-Gateway ™ own traffic.
  3. For reader interest: If DNS settings on Whonix-Gateway ™ are changed in /etc/resolv.conf, this only affects Whonix-Gateway ™ own DNS requests issued by applications using the system's default DNS resolver. By default, no applications issuing network traffic on Whonix-Gateway ™ use the system's default DNS resolver. All applications installed by default on Whonix-Gateway ™ that issue network traffic (apt-get, whonixcheck, sdwdate) are explicitly configured, or forced by uwt wrappers, to use their own Tor SocksPort (see Stream Isolation).
  4. Whonix-Workstation ™ default applications are configured to use separate Tor SocksPorts (see Stream Isolation), thereby not using the system's default DNS resolver. Any applications in Whonix-Workstation ™ that are not configured for stream isolation - for example nslookup - will use the default DNS server configured in Whonix-Workstation ™ (via /etc/network/interfaces), which is the Whonix-Gateway ™. Those DNS requests are redirected to Tor's DnsPort by Whonix-Gateway ™ firewall. Whonix-Gateway ™ /etc/resolv.conf does not affect Whonix-Workstation ™ DNS requests.
  5. That is because DNS traffic originating from Whonix-Workstation ™ gets redirected to Tor's DNSPort running on Whonix-Gateway ™ by Whonix-Gateway Firewall.


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