[Buildbot] #3151: host reverse DNS
Buildbot trac
trac at buildbot.net
Sat Jan 24 19:51:24 UTC 2015
#3151: host reverse DNS
-------------------+--------------------------------
Reporter: dustin | Owner: dustin
Type: task | Status: assigned
Priority: major | Milestone: sys - on-bb-infra
Version: | Resolution:
Keywords: |
-------------------+--------------------------------
Comment (by dustin):
OK, tracking this down from the top level. The first few are boring:
{{{
dustin at euclid ~ $ dig @a.root-servers.net -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
;; AUTHORITY SECTION:
in-addr.arpa. 172800 IN NS f.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS e.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS d.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS c.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS b.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS a.in-addr-servers.arpa.
dustin at euclid ~ $ dig @a.in-addr-servers.arpa. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
;; AUTHORITY SECTION:
140.in-addr.arpa. 86400 IN NS y.arin.net.
140.in-addr.arpa. 86400 IN NS t.arin.net.
140.in-addr.arpa. 86400 IN NS r.arin.net.
140.in-addr.arpa. 86400 IN NS w.arin.net.
140.in-addr.arpa. 86400 IN NS x.arin.net.
140.in-addr.arpa. 86400 IN NS u.arin.net.
140.in-addr.arpa. 86400 IN NS v.arin.net.
140.in-addr.arpa. 86400 IN NS z.arin.net.
dustin at euclid ~ $ dig @y.arin.net. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
;; AUTHORITY SECTION:
211.140.in-addr.arpa. 86400 IN NS ns1.nero.net.
211.140.in-addr.arpa. 86400 IN NS ns2.nero.net.
211.140.in-addr.arpa. 86400 IN NS phloem.uoregon.edu.
dustin at euclid ~ $ dig @ns1.nero.net. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
;; AUTHORITY SECTION:
128-255.10.211.140.in-addr.arpa. 259200 IN NS ns3.auth.osuosl.org.
128-255.10.211.140.in-addr.arpa. 259200 IN NS ns2.rtems.org.
128-255.10.211.140.in-addr.arpa. 259200 IN NS ns1.auth.osuosl.org.
128-255.10.211.140.in-addr.arpa. 259200 IN NS ns2.auth.osuosl.org.
128-255.10.211.140.in-addr.arpa. 259200 IN NS ns1.rtems.org.
}}}
OK, so we have four hosts that are authoritative for the 128-255
subdomain. So they should all give the same answers. But they don't!
The RTEMS servers give:
{{{
dustin at euclid ~ $ dig @ns1.rtems.org. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
; <<>> DiG 9.9.5 <<>> @ns1.rtems.org. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19118
;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;243.224-255.128-255.10.211.140.in-addr.arpa. IN PTR
;; ANSWER SECTION:
243.224-255.128-255.10.211.140.in-addr.arpa. 86400 IN PTR
ftp.buildbot.net.
;; AUTHORITY SECTION:
224-255.128-255.10.211.140.in-addr.arpa. 7200 IN NS c.ns.buddyns.com.
224-255.128-255.10.211.140.in-addr.arpa. 7200 IN NS f.ns.buddyns.com.
224-255.128-255.10.211.140.in-addr.arpa. 7200 IN NS ns1.rtems.org.
224-255.128-255.10.211.140.in-addr.arpa. 7200 IN NS ns1.darkbeer.org.
;; Query time: 80 msec
;; SERVER: 140.211.10.139#53(140.211.10.139)
;; WHEN: Sat Jan 24 14:38:46 EST 2015
;; MSG SIZE rcvd: 202
}}}
The PTR record isn't on the osuosl servers, but the NS records (authority
section) should be. It's not:
{{{
dustin at euclid ~ $ dig @ns1.auth.osuosl.org. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
; <<>> DiG 9.9.5 <<>> @ns1.auth.osuosl.org. -tptr +norecurse -4
243.224-255.128-255.10.211.140.in-addr.arpa.
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 7047
;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;243.224-255.128-255.10.211.140.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
128-255.10.211.140.in-addr.arpa. 86400 IN SOA ns1.rtems.org.
abuse.rtems.org. 43 10800 3600 604800 600
;; Query time: 81 msec
;; SERVER: 140.211.166.140#53(140.211.166.140)
;; WHEN: Sat Jan 24 14:38:39 EST 2015
;; MSG SIZE rcvd: 116
}}}
Both sets of hosts appear to have the same serial (43) for the 128-255
zone, but are giving different answers.
--
Ticket URL: <http://trac.buildbot.net/ticket/3151#comment:16>
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