Current private-address default?

Fredrik Pettai pettai at sunet.se
Mon Apr 25 12:55:46 UTC 2022


Hi,

It was some years since this option was added (unbound 1.5.7 I think).
As per the man page for unbound.conf:

...skipping...
       private-address: <IP address or subnet>
              Give  IPv4  of  IPv6  addresses  or classless subnets. These are
              addresses on your private network, and are  not  allowed  to  be
              returned  for  public  internet  names.   Any occurrence of such
              addresses are removed from DNS answers. Additionally, the DNSSEC
              validator  may  mark  the  answers  bogus. This protects against
              so-called DNS Rebinding, where a user browser is turned  into  a
              network  proxy,  allowing  remote  access through the browser to
              other parts of your private network.  Some names can be  allowed
              to contain your private addresses, by default all the local-data
              that you configured is allowed to, and  you  can  specify  addi‐
              tional  names  using  private-domain.   No private addresses are
              enabled by default.  We consider to enable this for the  RFC1918
              private  IP  address  space  by  default in later releases. That
              would enable  private  addresses  for  10.0.0.0/8  172.16.0.0/12
              192.168.0.0/16  169.254.0.0/16 fd00::/8 and fe80::/10, since the
              RFC standards say these addresses should not be visible  on  the
              public internet.


Q: Are there any plans to update this and add the RFC1918 addresses
as non-resolvable by default ?

(I’ve noticed that we do see some errors that is an artefact of unbound still are
 allowing those by default)

Re,
/P
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