Queries to DNS Blackholes don't respond

Roberto Carna robertocarna36 at gmail.com
Wed Apr 18 14:56:46 UTC 2018


Sorry, after query succesfully the DNS Blackholes, I repeat the
command and the same servers couldn't be reached anymore:

DNS:~# host -t NS 10.IN-ADDR.ARPA 192.175.48.6
;; connection timed out; no servers could be reached

DNS:~# host -t NS 10.IN-ADDR.ARPA 192.175.48.42
;; connection timed out; no servers could be reached

I don't know why the DNS Blackholes don't respond always.....I
continue quering the DNS Blackholes and they can't be reached
anymore....why ?

Thanks a lot again.

2018-04-18 11:44 GMT-03:00 Roberto Carna <robertocarna36 at gmail.com>:
> Dear, I have impelmented a BIND9 server. It works OK, but some days
> ago an application failed because it needed to resolve the reverse of
> some IP addresses from range 10.x.x.x, and they waited for a long time
> and failed, because they need a NXDOMAIN fast response.
>
> I don't want to make a local zone 10.IN-ADDR.ARPA, because I want to
> use the two public nameservers from Internet:
>
> BLACKHOLE-1.IANA.ORG (192.175.48.6)
> BLACKHOLE-2.IANA.ORG (192.175.48.42)
>
> When I query these DNS's from my console from the BIND server, and
> from any host I have available here, the result is this:
>
> root at DNS:~# host -t NS 10.IN-ADDR.ARPA 192.175.48.6
> Using domain server:
> Name: 192.175.48.6
> Address: 192.175.48.6#53
> Aliases:
>
> 10.in-addr.arpa name server blackhole-2.iana.org.
> 10.in-addr.arpa name server blackhole-1.iana.org.
>
> and finally I get the NXDOMAIN I need:
>
> DNS:~# host -t NS 10.10.12.1 192.175.48.6
> Using domain server:
> Name: 192.175.48.6
> Address: 192.175.48.6#53
> Aliases:
>
> Host 1.12.10.10.in-addr.arpa. not found: 3(NXDOMAIN)
>
> Is it OK that I do? Are blackholes servers useful for this purpose ?
>
> Thanks a lot !!!


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