DNS resolution question
Casey Scott
casey at scottmail.org
Thu Dec 25 15:43:22 UTC 2014
Another piece of data:
When the server in question is pointed to another server for DNS resolution (/etc/resolv.conf), the bind-utils (host/nslookup) can successfully lookup the same records. That machine is running Centos 6.6. Its named -V
BIND 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.1 built with '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-libtool' '--localstatedir=/var' '--enable-threads' '--enable-ipv6' '--enable-filter-aaaa' '--with-pic' '--disable-static' '--disable-openssl-version-check' '--with-dlopen=yes' '--with-dlz-ldap=yes' '--with-dlz-postgres=yes' '--with-dlz-mysql=yes' '--with-dlz-filesystem=yes' '--with-gssapi=yes' '--disable-isc-spnego' '--with-docbook-xsl=/usr/share/sgml/docbook/xsl-stylesheets' '--enable-fixed-rrset' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS= -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' 'CPPFLAGS= -DDIG_SIGCHASE'
using OpenSSL version: OpenSSL 1.0.1e 11 Feb 2013
using libxml2 version: 2.7.6
Noting that on the Linux server, IPv6 is enabled (though the server doesn't use IPv6), I recompiled BIND with IPv6 enabled. Same result though. I can not resolve vuxml.freebsd.org with it.
----- On Dec 25, 2014, at 7:03 AM, Casey Scott casey at scottmail.org wrote:
> named -V output includes '--disable-ipv6'. Isn't that explicitly disabling IPv6?
>
> Thanks.
>
> ----- On Dec 24, 2014, at 1:57 PM, g lister g.lister at nodeunit.ch wrote:
>
>> On Wed Dec 24 22:09:26 2014 GMT+0100, Casey Scott wrote:
>>> Ah.. well in that case, IPv6 is already disabled in named.
>>
>> Is it disabled explicitly? I mean by a directive. I had also disabled it ... By
>> not enabling it but I had to disable it explicitly and then some queries coming
>> from my internal network and my smtp started working. Problem is you need to
>> have functioning IPv6 network setup to make use of it.
>> Sorry for being short but writing on a phone is a pain. The syntax should be in
>> a man page or the net.
>>
>> HTH,
>> George
>>
>>>
>>>
>>> ----- On Dec 24, 2014, at 11:34 AM, g lister g.lister at nodeunit.ch wrote:
>>>
>>> > On Wed Dec 24 20:07:40 2014 GMT+0100, Casey Scott wrote:
>>> >> I can't disable IPv4 because my environment uses it. Thanks though.
>>> >
>>> > Sorry I meant IPv6, AAAA are v6 querries I think.
>>> >
>>> >>
>>> >> Casey
>>> >>
>>> >> ----- On Dec 24, 2014, at 10:10 AM, g lister g.lister at nodeunit.ch wrote:
>>> >>
>>> >> > On Wed Dec 24 18:57:42 2014 GMT+0100, Casey Scott wrote:
>>> >> >> That's what's odd. The tcpdump shows a seemingly valid response comeback,
>>> >> >> however dig/host always fail with a timeout. It seems to me that named isn't
>>> >> >> passing along the response for some reason.
>>> >> >>
>>> >> >> Thanks.
>>> >> >
>>> >> >
>>> >> > Have you tried disabling IPv4 and checking whether it works?
>>> >> > I had a similiar issue with bind and without IPv4 it was OK.
>>> >> >
>>> >> > HTH,
>>> >> > George
>>> >> >
>>> >> >>
>>> >> >> ----- On Dec 24, 2014, at 8:31 AM, Bruce Ferrell bferrell at baywinds.org wrote:
>>> >> >>
>>> >> >> > On 12/24/2014 06:40 AM, Casey Scott wrote:
>>> >> >> >> This issue surfaced when I noticed this entry in my servers daily security mail:
>>> >> >> >>
>>> >> >> >> Checking for packages with security vulnerabilities:
>>> >> >> >> pkg: http://vuxml.freebsd.org/freebsd/vuln.xml.bz2: No address record
>>> >> >> >> pkg: cannot fetch vulnxml file
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> I discovered that the server is not able to resolve vuxml.freebsd.org, or even
>>> >> >> >> www.freebsd.org. I'm sure the problem isn't specific to the freebsd.org zone,
>>> >> >> >> but that's where I focused my effort. I found that recursive queries failed,
>>> >> >> >> however if I directly queried a name server authoritative for freebsd.org (i.e.
>>> >> >> >> ns1.isc-sns.net.), the query successfully returned the CNAME.
>>> >> >> >>
>>> >> >> >> OS Details:
>>> >> >> >> FreeBSD mustang 9.3-RELEASE FreeBSD 9.3-RELEASE #0 r271930: Sun Sep 21 19:01:57
>>> >> >> >> PDT 2014 root at mustang:/usr/src/sys/amd64/compile/Server amd64
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> DNS lookup attempt
>>> >> >> >> *******************************************************************************
>>> >> >> >> $ dig vuxml.freebsd.org +trace
>>> >> >> >> ; <<>> DiG 9.9.6-P1 <<>> vuxml.freebsd.org +trace
>>> >> >> >> ;; global options: +cmd
>>> >> >> >> . 517326 IN NS e.root-servers.net.
>>> >> >> >> . 517326 IN NS m.root-servers.net.
>>> >> >> >> . 517326 IN NS c.root-servers.net.
>>> >> >> >> . 517326 IN NS d.root-servers.net.
>>> >> >> >> . 517326 IN NS b.root-servers.net.
>>> >> >> >> . 517326 IN NS f.root-servers.net.
>>> >> >> >> . 517326 IN NS g.root-servers.net.
>>> >> >> >> . 517326 IN NS i.root-servers.net.
>>> >> >> >> . 517326 IN NS k.root-servers.net.
>>> >> >> >> . 517326 IN NS l.root-servers.net.
>>> >> >> >> . 517326 IN NS a.root-servers.net.
>>> >> >> >> . 517326 IN NS j.root-servers.net.
>>> >> >> >> . 517326 IN NS h.root-servers.net.
>>> >> >> >> . 517326 IN RRSIG NS 8 0 518400 20141231050000
>>> >> >> >> 20141224040000 22603 . OT3Uv0Krt43V999nh6ky8sK7Uob+Qb+M82BOS0uPTFxq1NL6m2XX7ri3
>>> >> >> >> n/na4QyB/+iGTAlonAMVGyXEO1llrJt6iw7yucBriqy/xuGCwSY5Sllc
>>> >> >> >> Y3G7RdzerNgmAhfD2wiCwJPnVuGaD3O5318r2TLrsXdoQwGk7FNWiE1X GBE=
>>> >> >> >> ;; Received 913 bytes from 192.168.1.1#53(192.168.1.1) in 0 ms
>>> >> >> >>
>>> >> >> >> org. 172800 IN NS b2.org.afilias-nst.org.
>>> >> >> >> org. 172800 IN NS a2.org.afilias-nst.info.
>>> >> >> >> org. 172800 IN NS d0.org.afilias-nst.org.
>>> >> >> >> org. 172800 IN NS b0.org.afilias-nst.org.
>>> >> >> >> org. 172800 IN NS a0.org.afilias-nst.info.
>>> >> >> >> org. 172800 IN NS c0.org.afilias-nst.info.
>>> >> >> >> org. 86400 IN DS 21366 7 2
>>> >> >> >> 96EEB2FFD9B00CD4694E78278B5EFDAB0A80446567B69F634DA078F0 D90F01BA
>>> >> >> >> org. 86400 IN DS 21366 7 1
>>> >> >> >> E6C1716CFB6BDC84E84CE1AB5510DAC69173B5B2
>>> >> >> >> org. 86400 IN RRSIG DS 8 1 86400 20141231050000
>>> >> >> >> 20141224040000 22603 . IjE3Yi3yF8a12dOlLt13Grqs7c2tOXwgyyghAkeqy36N14VrAGxsQMxU
>>> >> >> >> RlOE5rYwzeg1cLi55wRxGShNBz0/KU229xWrRNluzLUkbo+eW98E6Fcw
>>> >> >> >> nT/DHrIy9J/3zjf6NRC+zUUcQTOJGWAkPF40TqaJGwI0Ag6/p6yxcBJ5 MDM=
>>> >> >> >> ;; Received 691 bytes from 192.112.36.4#53(g.root-servers.net) in 73 ms
>>> >> >> >>
>>> >> >> >> freebsd.org. 86400 IN NS ns2.isc-sns.com.
>>> >> >> >> freebsd.org. 86400 IN NS ns1.isc-sns.net.
>>> >> >> >> freebsd.org. 86400 IN NS ns3.isc-sns.info.
>>> >> >> >> freebsd.org. 86400 IN DS 32659 8 2
>>> >> >> >> AF3B32E46DF2FC32C0110C7D6B808EE73E0411501AFAF9022D3DCD0A FA5B3ACD
>>> >> >> >> freebsd.org. 86400 IN RRSIG DS 7 2 86400 20150109163356
>>> >> >> >> 20141219153356 11112 org.
>>> >> >> >> puF07NdtGtOY0uI3d789itchA2dEXz0URwCsckm7vjWoNIhdsMuG6jFc
>>> >> >> >> StzdAkvFDiDO/2C3x21spRrb7Y3ioDQpNJL2zJUn2S0L/8ueDbF9wJAT
>>> >> >> >> pEfAdMyUwlCQkVM45Ptf98z7iLTWWe2xQBhZZ1OGaPRW+VwKE0rCaz2d 1rg=
>>> >> >> >> ;; Received 345 bytes from 199.19.53.1#53(c0.org.afilias-nst.info) in 134 ms
>>> >> >> >>
>>> >> >> >> ;; connection timed out; no servers could be reached
>>> >> >> >> *******************************************************************************
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> tcpdump of the query above
>>> >> >> >> *******************************************************************************
>>> >> >> >> listening on fxp0, link-type EN10MB (Ethernet), capture size 65535 bytes
>>> >> >> >> 05:59:36.016640 IP x.x.x.x.54272 > 38.103.2.1.53: 18640 [1au] A?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:36.127776 IP 38.103.2.1.53 > x.x.x.x.54272: 18640*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, A 8.8.178.110, RRSIG (1464)
>>> >> >> >> 05:59:38.021067 IP x.x.x.x.52431 > 38.103.2.1.53: 13086 [1au] AAAA?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:38.051272 IP x.x.x.x.51125 > 63.243.194.1.53: 16824 [1au] A?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:38.081819 IP 63.243.194.1.53 > x.x.x.x.51125: 16824*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, A 8.8.178.110, RRSIG (1464)
>>> >> >> >> 05:59:38.132821 IP 38.103.2.1.53 > x.x.x.x.52431: 13086*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, AAAA, RRSIG (1464)
>>> >> >> >> 05:59:40.056275 IP x.x.x.x.62003 > 63.243.194.1.53: 41954 [1au] AAAA?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:40.086597 IP 63.243.194.1.53 > x.x.x.x.62003: 41954*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, AAAA, RRSIG (1464)
>>> >> >> >> 05:59:40.267272 IP x.x.x.x.61416 > 72.52.71.1.53: 32843 [1au] A?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:40.297103 IP 72.52.71.1.53 > x.x.x.x.61416: 32843*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, A 8.8.178.110, RRSIG (1464)
>>> >> >> >> 05:59:42.272273 IP x.x.x.x.54674 > 72.52.71.1.53: 2755 [1au] AAAA?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:42.302289 IP 72.52.71.1.53 > x.x.x.x.54674: 2755*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, AAAA, RRSIG (1464)
>>> >> >> >> 05:59:42.487277 IP x.x.x.x.54239 > 38.103.2.1.53: 38272 [1au] A?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:42.598927 IP 38.103.2.1.53 > x.x.x.x.54239: 38272*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, A 8.8.178.110, RRSIG (1464)
>>> >> >> >> 05:59:44.492281 IP x.x.x.x.59505 > 38.103.2.1.53: 22873 [1au] AAAA?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:44.604217 IP 38.103.2.1.53 > x.x.x.x.59505: 22873*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, AAAA, RRSIG (1464)
>>> >> >> >> 05:59:44.722266 IP x.x.x.x.61141 > 63.243.194.1.53: 50828 [1au] A?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:44.753517 IP 63.243.194.1.53 > x.x.x.x.61141: 50828*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, A 8.8.178.110, RRSIG (1464)
>>> >> >> >> 05:59:46.727324 IP x.x.x.x.49803 > 63.243.194.1.53: 51222 [1au] AAAA?
>>> >> >> >> vuxml.freebsd.org. (46)
>>> >> >> >> 05:59:46.757577 IP 63.243.194.1.53 > x.x.x.x.49803: 51222*- 4/4/11 CNAME
>>> >> >> >> wfe0.ysv.freebsd.org., RRSIG, AAAA, RRSIG (1464)
>>> >> >> >> 05:59:57.395692 IP x.x.x.x.60149 > 165.254.1.208.53: 31873 [1au] A?
>>> >> >> >> e6238.a.akamaiedge.net. (51)
>>> >> >> >> 05:59:57.404644 IP 165.254.1.208.53 > x.x.x.x.60149: 31873*- 1/0/0 A 96.7.67.53
>>> >> >> >> (56)
>>> >> >> >> *******************************************************************************
>>> >> >> >>
>>> >> >> >> BIND build options
>>> >> >> >> *******************************************************************************
>>> >> >> >> # named -V
>>> >> >> >> BIND 9.9.6-P1 (Extended Support Version) <id:3612d8fb> built by make with
>>> >> >> >> '--localstatedir=/var' '--disable-linux-caps' '--disable-symtable'
>>> >> >> >> '--with-randomdev=/dev/random' '--with-libxml2=/usr/local'
>>> >> >> >> '--disable-filter-aaaa' '--disable-fixed-rrset' '--without-gost'
>>> >> >> >> '--without-idn' '--disable-ipv6' '--disable-largefile' '--disable-newstats'
>>> >> >> >> '--without-python' '--disable-rpz-nsdname' '--disable-rpz-nsip' '--disable-rrl'
>>> >> >> >> '--with-openssl=/usr/local' '--without-gssapi' '--enable-threads'
>>> >> >> >> '--sysconfdir=/etc/namedb' '--prefix=/usr' '--mandir=/usr/share/man'
>>> >> >> >> '--infodir=/usr/share/info/' '--build=amd64-portbld-freebsd9.3'
>>> >> >> >> 'build_alias=amd64-portbld-freebsd9.3' 'CC=cc' 'CFLAGS=-O2 -pipe -march=native
>>> >> >> >> -fstack-protector -fno-strict-aliasing' 'LDFLAGS= -Wl,-rpath,/usr/local/lib
>>> >> >> >> -fstack-protector' 'LIBS=' 'CPPFLAGS=' 'CPP=cpp'
>>> >> >> >> compiled by GCC 4.2.1 20070831 patched [FreeBSD]
>>> >> >> >> using OpenSSL version: OpenSSL 1.0.1j 15 Oct 2014
>>> >> >> >> using libxml2 version: 2.9.2
>>> >> >> >> *******************************************************************************
>>> >> >> >>
>>> >> >> >> Any idea what's going on here?
>>> >> >> >>
>>> >> >> >> Thanks,
>>> >> >> >> Casey
>>> >> >> >>
>>> >> >> >> _______________________________________________
>>> >> >> >> freebsd-questions at freebsd.org mailing list
>>> >> >> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> >> >> >> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>>> >> >> >>
>>> >> >> > Casey,
>>> >> >> >
>>> >> >> > think you're getting a correct response.
>>> >> >> > dig @192.0.2.131 vuxml.freebsd.org
>>> >> >> >
>>> >> >> > ; <<>> DiG 9.9.5-rpz2+rl.14038.05-P1 <<>> @192.0.2.131 vuxml.freebsd.org
>>> >> >> > ; (1 server found)
>>> >> >> > ;; global options: +cmd
>>> >> >> > ;; Got answer:
>>> >> >> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54956
>>> >> >> > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 6
>>> >> >> >
>>> >> >> > ;; OPT PSEUDOSECTION:
>>> >> >> > ; EDNS: version: 0, flags:; udp: 4096
>>> >> >> > ;; QUESTION SECTION:
>>> >> >> > ;vuxml.freebsd.org. IN A
>>> >> >> >
>>> >> >> > ;; ANSWER SECTION:
>>> >> >> > vuxml.freebsd.org. 497 IN CNAME wfe0.ysv.freebsd.org.
>>> >> >> > wfe0.ysv.freebsd.org. 497 IN A 8.8.178.110
>>> >> >> >
>>> >> >> > ;; AUTHORITY SECTION:
>>> >> >> > freebsd.org. 497 IN NS ns3.isc-sns.info.
>>> >> >> > freebsd.org. 497 IN NS ns2.isc-sns.com.
>>> >> >> > freebsd.org. 497 IN NS ns1.isc-sns.net.
>>> >> >> >
>>> >> >> > ;; ADDITIONAL SECTION:
>>> >> >> > ns1.isc-sns.net. 2488 IN A 72.52.71.1
>>> >> >> > ns1.isc-sns.net. 166365 IN AAAA 2001:470:1a::1
>>> >> >> > ns2.isc-sns.com. 2488 IN A 38.103.2.1
>>> >> >> > ns3.isc-sns.info. 2488 IN A 63.243.194.1
>>> >> >> > ns3.isc-sns.info. 79965 IN AAAA 2001:5a0:10::1
>>> >> >> >
>>> >> >> > ;; Query time: 1 msec
>>> >> >> > ;; SERVER: 192.0.2.131#53(192.0.2.131)
>>> >> >> > ;; WHEN: Wed Dec 24 08:28:06 PST 2014
>>> >> >> > ;; MSG SIZE rcvd: 277
>>> >> >> >
>>> >> >> > Notice in the answer section of my simplified query via my local nameserver,
>>> >> >> > wfe0.ysv.freebsd.org is in the A record. I saw the same response in your
>>> >> >> > query, it was just harder to see.
>>> >> >> >
>>> >> >> >
>>> >> >> > _______________________________________________
>>> >> >> > freebsd-questions at freebsd.org mailing list
>>> >> >> > http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> >> >> > To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>>> >> >> _______________________________________________
>>> >> >> freebsd-questions at freebsd.org mailing list
>>> >> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> >> >> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>>> >> >>
>>> >> >
>>> >> > --
>>> >> _______________________________________________
>>> >> freebsd-questions at freebsd.org mailing list
>>> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
>>> >> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
>>> >>
>>> >
>>> > --
>>>
>>
>> --
> _______________________________________________
> freebsd-questions at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
More information about the freebsd-questions
mailing list