North American Network Operators Group
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rfc-1918 reverses broken again (still?)

  • From: Marc Slemko
  • Date: Fri May 29 03:57:24 1998 
The reverse lookups for the RFC-1918 address space are broken again, or
still.

$ dig -x 172.16 any @blackhole.isi.edu

; <<>> DiG 8.1 <<>> -x any @blackhole.isi.edu 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; res_send to server blackhole.isi.edu  128.9.64.26: Connection timed out

blackhole.isi.edu and rs0.internic.net are timing out, while
ns2.internic.net is giving wrong answers:

$ dig -x 192.168.1.1 @ns2.internic.net

; <<>> DiG 2.2 <<>> -x @ns2.internic.net 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 10
;; flags: qr rd; Ques: 1, Ans: 0, Auth: 0, Addit: 0
;; QUESTIONS:
;;      1.1.168.192.in-addr.arpa, type = ANY, class = IN

;; Total query time: 145 msec
;; FROM: valis.worldgate.com to SERVER: ns2.internic.net  198.41.0.11
;; WHEN: Fri May 29 01:33:24 1998
;; MSG SIZE  sent: 42  rcvd: 42

$ dig -x 192.168.1.1 @blackhole.isi.edu

; <<>> DiG 2.2 <<>> -x @blackhole.isi.edu 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; res_send to server blackhole.isi.edu  128.9.64.26: Operation timed out

Heck, not having any servers for the space is a lot better than the
current situation.  It makes traceroutes over links using private address
space (it happens and some people recommend it, even though I'm not fond
of the idea...) annoying.