Porblems with Lycos.com host lookup.

Mark Andrews marka at isc.org
Sat Aug 22 03:52:15 UTC 2009


In message <65afb5970908210654s56231ce1g461a251fe9afa869 at mail.gmail.com>, Matt 
writes:
> Hi all,
> 
> 
> 
> We are seeing odd behaviour when attempting to look up the following url
> from a range of Redhat servers.

The lycos.com servers are returning malformed responses.  The NS
RRset should not be for lycosmail.lycos.com.  See RFC 1034 and RFC
2308.  This response is wrong whether you are following RFC 1034
or RFC 1034 as modified by RFC 2308.

bigmail1.lycosmail.lycos.com. 3600 IN   CNAME   mail-bigmail1.bo3.lycos.com.
lycosmail.lycos.com.    3600    IN      NS      ns1.lycos.com.
lycosmail.lycos.com.    3600    IN      NS      ns2.lycos.com.
lycosmail.lycos.com.    3600    IN      NS      ns3.lycos.com.
lycosmail.lycos.com.    3600    IN      NS      ns4.lycos.com.
;; Received 214 bytes from 209.202.248.141#53(ns1.lycos.com) in 266 ms

Since lycosmail.lycos.com, bo3.lycos.com and lycos.com all have the
same servers this should have been the following for the A query
(the NS RRset is optional).

bigmail1.lycosmail.lycos.com. 3600 IN   CNAME   mail-bigmail1.bo3.lycos.com.
mail-bigmail1.bo3.lycos.com. 3332 IN    A       209.202.248.251
bo3.lycos.com.    3600    IN      NS      ns1.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns2.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns3.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns4.lycos.com.

and the following for the MX and AAAA queries (the NS and SOA RRsets
are optional and you can't have the NS RRset without the SOA RRset).

bigmail1.lycosmail.lycos.com. 3600 IN   CNAME   mail-bigmail1.bo3.lycos.com.
bo3.lycos.com.          2560    IN      SOA     invisible.lycos.com. nic-tech.lycos-inc.com. 1250271200 16384 2048 1048576 2560
bo3.lycos.com.    3600    IN      NS      ns1.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns2.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns3.lycos.com.
bo3.lycos.com.    3600    IN      NS      ns4.lycos.com.

If they weren't being served by the same servers then a referral
to the bo3.lycos.com zone should have been returned RFC 1034.

> bigmail1.lycosmail.lycos.com  should resolve to 209.202.248.251 but we see
> the following.
> 
> [xx at xxxx ~]$ host bigmail1.lycosmail.lycos.com
> 
> Host bigmail1.lycosmail.lycos.com not found: 2(SERVFAIL)
> 
> 
> 
> But then if we
> 
> 
> 
> [xx at xxxx~]$ dig -t any bigmail1.lycosmail.lycos.com

	ANY queries don't follow CNAMEs.
 
> ; <<>> DiG 9.3.4-P1 <<>> -t any bigmail1.lycosmail.lycos.com
> 
> ;; global options:  printcmd
> 
> ;; Got answer:
> 
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63245
> 
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1
> 
> 
> 
> ;; QUESTION SECTION:
> 
> ;bigmail1.lycosmail.lycos.com.  IN      ANY
> 
> 
> 
> ;; ANSWER SECTION:
> 
> bigmail1.lycosmail.lycos.com. 3600 IN   CNAME   mail-bigmail1.bo3.lycos.com=
> .
> 
> 
> 
> ;; AUTHORITY SECTION:
> 
> lycosmail.lycos.com.    3600    IN      NS      ns1.lycos.com.
> 
> lycosmail.lycos.com.    3600    IN      NS      ns2.lycos.com.
> 
> lycosmail.lycos.com.    3600    IN      NS      ns3.lycos.com.
> 
> lycosmail.lycos.com.    3600    IN      NS      ns4.lycos.com.
> 
> 
> 
> ;; ADDITIONAL SECTION:
> 
> ns4.lycos.com.          73682   IN      A       209.202.244.142
> 
> 
> 
> ;; Query time: 110 msec
> 
> ;; SERVER: 127.0.0.1#53(127.0.0.1)
> 
> ;; WHEN: Fri Aug 21 14:26:47 2009
> 
> ;; MSG SIZE  rcvd: 166
> 
> 
> 
> And then
> 
> 
> 
> [xx at xxxx~]$ host bigmail1.lycosmail.lycos.com
> 
> bigmail1.lycosmail.lycos.com is an alias for mail-bigmail1.bo3.lycos.com.
> 
> mail-bigmail1.bo3.lycos.com has address 209.202.248.251

	Because names has cached the CNAME as the result of the ANY
	query.
 
> errors we see in the bind log
> 
> 05-Aug-2009 12:53:36.118 resolver: debug 1: createfetch:
> bigmail1.lycosmail.lycos.com A
> 
> 05-Aug-2009 12:53:36.202 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.244.142#53
> 
> 05-Aug-2009 12:53:36.286 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.248.142#53
> 
> 05-Aug-2009 12:53:36.369 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.244.141#53
> 
> 05-Aug-2009 12:53:36.453 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.248.141#53
> 
> 05-Aug-2009 12:53:36.453 resolver: debug 1: createfetch:
> bigmail1.lycosmail.lycos.com A
> 
> 05-Aug-2009 12:53:36.537 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.244.141#53
> 
> 05-Aug-2009 12:53:36.621 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.248.142#53
> 
> 05-Aug-2009 12:53:36.704 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.244.142#53
> 
> 05-Aug-2009 12:53:36.788 lame-servers: info: FORMERR resolving
> 'bigmail1.lycosmail.lycos.com/A/IN': 209.202.248.141#53
> 
> 05-Aug-2009 12:57:31.142 resolver: debug 1: createfetch: scansafe.com A
> 
> 
> 
> The expected subdomain is returned, the only other FORMERR cases I=92ve see=
> n
> (on google) show  the authority section not matching the answer.
> 
> 
> 
> A debug trace may be found at
> http://the.earth.li/~huggie/lycos-bind9-issue.txt<http://the.earth.li/%7Ehu=
> ggie/lycos-bind9-issue.txt>
>   Any suggestions as to what the issue is or how it may be resolved would b=
> e
> very welcome.
> 
> 
> 
> 
> 
> Kind Regards
> 
> 
> Matt
> 
> --001485f79224cc3a450471a7360f
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> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >Hi all,</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >We are
> seeing odd behaviour when attempting to look up the following url from a ra=
> nge
> of Redhat servers.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.c=
> om</a><span style=3D"">=A0 </span>should resolve to 209.202.248.251 but we =
> see
> the following.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >[xx at xxxx
> ~]$ host <a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail=
> .lycos.com</a></span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >Host
> <a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.co=
> m</a> not found: 2(SERVFAIL)</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><span style=3D"">=A0</span></span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >But then if
> we </span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >[xx at xxxx~]$
> dig -t any <a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosma=
> il.lycos.com</a></span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;
> <<>> DiG 9.3.4-P1 <<>> -t any <a href=3D"http://big=
> mail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.com</a></span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; global
> options:<span style=3D"">=A0 </span>printcmd</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; Got
> answer:</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;;
> ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63245</span></=
> p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; flags:
> qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; QUESTION
> SECTION:</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;<a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.=
> com</a>.<span style=3D"">=A0 </span>IN<span style=3D"">=A0=A0=A0=A0=A0
> </span>ANY</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; ANSWER
> SECTION:</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.c=
> om</a>.
> 3600 IN<span style=3D"">=A0=A0 </span>CNAME<span style=3D"">=A0=A0 </span><=
> a href=3D"http://mail-bigmail1.bo3.lycos.com">mail-bigmail1.bo3.lycos.com</=
> a>.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;;
> AUTHORITY SECTION:</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://lycosmail.lycos.com">lycosmail.lycos.com</a>.<span style=
> =3D"">=A0=A0=A0 </span>3600<span style=3D"">=A0=A0=A0
> </span>IN<span style=3D"">=A0=A0=A0=A0=A0 </span>NS<span style=3D"">=A0=A0=
> =A0=A0=A0 </span><a href=3D"http://ns1.lycos.com">ns1.lycos.com</a>.</span>=
> </p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://lycosmail.lycos.com">lycosmail.lycos.com</a>.<span style=
> =3D"">=A0=A0=A0 </span>3600<span style=3D"">=A0=A0=A0
> </span>IN<span style=3D"">=A0=A0=A0=A0=A0 </span>NS<span style=3D"">=A0=A0=
> =A0=A0=A0 </span><a href=3D"http://ns2.lycos.com">ns2.lycos.com</a>.</span>=
> </p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://lycosmail.lycos.com">lycosmail.lycos.com</a>.<span style=
> =3D"">=A0=A0=A0 </span>3600<span style=3D"">=A0=A0=A0
> </span>IN<span style=3D"">=A0=A0=A0=A0=A0 </span>NS<span style=3D"">=A0=A0=
> =A0=A0=A0 </span><a href=3D"http://ns3.lycos.com">ns3.lycos.com</a>.</span>=
> </p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://lycosmail.lycos.com">lycosmail.lycos.com</a>.<span style=
> =3D"">=A0=A0=A0 </span>3600<span style=3D"">=A0=A0=A0
> </span>IN<span style=3D"">=A0=A0=A0=A0=A0 </span>NS<span style=3D"">=A0=A0=
> =A0=A0=A0 </span><a href=3D"http://ns4.lycos.com">ns4.lycos.com</a>.</span>=
> </p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;;
> ADDITIONAL SECTION:</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://ns4.lycos.com">ns4.lycos.com</a>.<span style=3D"">=A0=A0=
> =A0=A0=A0=A0=A0=A0=A0 </span>73682<span style=3D"">=A0=A0 </span>IN<span st=
> yle=3D"">=A0=A0=A0=A0=A0
> </span>A<span style=3D"">=A0=A0=A0=A0=A0=A0 </span>209.202.244.142</span></=
> p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; Query
> time: 110 msec</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; SERVER:
> 127.0.0.1#53(127.0.0.1)</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; WHEN:
> Fri Aug 21 14:26:47 2009</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >;; MSG
> SIZE<span style=3D"">=A0 </span>rcvd: 166</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >And then </span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >[xx at xxxx~]$
> host <a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lyc=
> os.com</a></span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://bigmail1.lycosmail.lycos.com">bigmail1.lycosmail.lycos.c=
> om</a>
> is an alias for <a href=3D"http://mail-bigmail1.bo3.lycos.com">mail-bigmail=
> 1.bo3.lycos.com</a>.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> ><a href=3D"http://mail-bigmail1.bo3.lycos.com">mail-bigmail1.bo3.lycos.com=
> </a>
> has address 209.202.248.251</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p><span style=3D"font-size: 10pt; font-family: Arial;">errors we see in th=
> e bind
> log</span></p>
> 
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.118 resolver:=
>  debug 1: createfetch: <a href=3D"http://bigmail1.lycosmail.lycos.com">bigm=
> ail1.lycosmail.lycos.com</a> A</span></pre><pre><span style=3D"font-family:=
>  Arial;">05-Aug-2009 12:53:36.202 lame-servers: info: FORMERR resolving &#3=
> 9;<a href=3D"http://bigmail1.lycosmail.lycos.com/A/IN">bigmail1.lycosmail.l=
> ycos.com/A/IN</a>': 209.202.244.142#53</span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.286 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.248.142#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.369 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.244.141#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.453 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.248.141#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.453 resolver:=
>  debug 1: createfetch: <a href=3D"http://bigmail1.lycosmail.lycos.com">bigm=
> ail1.lycosmail.lycos.com</a> A</span></pre><pre><span style=3D"font-family:=
>  Arial;">05-Aug-2009 12:53:36.537 lame-servers: info: FORMERR resolving &#3=
> 9;<a href=3D"http://bigmail1.lycosmail.lycos.com/A/IN">bigmail1.lycosmail.l=
> ycos.com/A/IN</a>': 209.202.244.141#53</span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.621 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.248.142#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.704 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.244.142#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:53:36.788 lame-serv=
> ers: info: FORMERR resolving '<a href=3D"http://bigmail1.lycosmail.lyco=
> s.com/A/IN">bigmail1.lycosmail.lycos.com/A/IN</a>': 209.202.248.141#53<=
> /span></pre>
> <pre><span style=3D"font-family: Arial;">05-Aug-2009 12:57:31.142 resolver:=
>  debug 1: createfetch: <a href=3D"http://scansafe.com">scansafe.com</a> A</=
> span></pre><pre><span style=3D"font-family: Arial;">=A0</span></pre>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >The expected
> subdomain is returned, the only other FORMERR cases I=92ve seen (on google)=
>  show <span style=3D"">=A0</span>the authority section not matching the ans=
> wer.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >A debug
> trace may be found at <a href=3D"http://the.earth.li/%7Ehuggie/lycos-bind9-=
> issue.txt">http://the.earth.li/~huggie/lycos-bind9-issue.txt</a>
> <span style=3D"">=A0=A0</span>Any suggestions as to what the issue is
> or how it may be resolved would be very welcome.</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >=A0</span></p>
> 
> <p class=3D"MsoNormal"><span style=3D"font-size: 10pt; font-family: Arial;"=
> >Kind
> Regards</span></p><p class=3D"MsoNormal"><br></p><p class=3D"MsoNormal">Mat=
> t<br><span style=3D"font-size: 10pt; font-family: Arial;"></span></p>
> 
> 
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> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org



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