Re: [SOLVED] Re: BIND9 SERVFAIL on some .gov addresses

Shaoquan Lin Tue, 22 Feb 2011 09:11:05 -0800

Mark,

Are these bugs (2784 and 1804) fixed by BIND 9.6.1-P3? My problem is that Ican not get A records of NSs (like vwall4a.nyc.gov) of nyc.gov fromb.gov-servers.net by BIND 9.6.1-P3 but with no problem with older BINDs like9.3. I don't know if the problem is with the authoritative nameservers forgov or the nameservers for nyc.gov or with the BIND I am using. I noticedthe following:

1). a.gov-servers.net or b.gov-servers.net does provide A records in theadditional records of their responses for other subdomain under gov liketreas.gov, just not nyc.gov. So the problem seems with nameservers fornyc.gov. The problem is relatively new and there might be some recentchanges on nyc.gov.

2) Older version of Binds (like 9.3) seems able to resolve vwall4a.nyc.govas shown the packets I captured in my previous e-mail.


What options in named.conf I can use to set "tc"?

Thank you.

Shaoquan Lin

----- Original Message -----From: "Mark Andrews" <ma...@isc.org>

To: "Shaoquan Lin" <l...@ccny.cuny.edu>
Cc: <bind-us...@isc.org>
Sent: Saturday, February 19, 2011 6:08 AM
Subject: Re: [SOLVED] Re: BIND9 SERVFAIL on some .gov addresses

In message <17894D6D30484DDFBBE95BEF987FF5D1@se179>, "Shaoquan Lin"writes:

Ryan,

Have you solved your problem?  I have similar problems. I run BIND =
9.6..1-P3 on my Solaris 10 and can not resolve anything in domain =
nyc.gov.  One thing I noticed is:  BIND 9.3 send query to =
b.gov-servers.net with no Additional records and got a response with  A =
records for the nyc.gov NS servers in the Additional records; but BIND =
9.6 send query with type OPT Additional records and got a response with =

also a type OPT but no A in the Additional records. So the BIND 9.6 can=

not find the IP addresses of the nyc.gov NS servers and therefore can =
not resolve anything in that domain.  Using options "max-udp-size  512" =
and "edns-udp-size  512"  does not solve the  problem.

The following are the what I captured.  Anyone have any suggestions to =
solve the problem?         =20

Shaoquan Lin


This is really a DNS protocol bug.  Glue is not optional when
returning a referral and failure to add glue should result in
"tc" being set.

Note: named should set "tc" in the case to work around this protocol
bug.  It's useful to have a real life example rather than a contrived
example.

2784.   [bug]           TC was not always being set when required glue was
                       dropped. [RT #20655]

1804. [bug] Ensure that if we are queried for glue that itfits

                       in the additional section or TC is set to tell the
                       client to retry using TCP. [RT #10114]

BIND 9.3 query:
Domain Name System (query)

Transaction ID: 0x94ca

Flags: 0x0000 (Standard query)

0... .... .... .... =3D Response: Message is a query

.000 0... .... .... =3D Opcode: Standard query (0)

.... ..0. .... .... =3D Truncated: Message is not truncated

.... ...0 .... .... =3D Recursion desired: Don't do query recursively

.... .... .0.. .... =3D Z: reserved (0)

.... .... ...0 .... =3D Non-authenticated data OK: Non-authenticated =
data is unacceptable

Questions: 1

Answer RRs: 0

Authority RRs: 0

Additional RRs: 0

Queries

vwall4a.nyc.gov: type A, class IN

Name: vwall4a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

BIND 9.3 response:

Domain Name System (response)

Transaction ID: 0x94ca

Flags: 0x8000 (Standard query response, No error)

1... .... .... .... =3D Response: Message is a response

.000 0... .... .... =3D Opcode: Standard query (0)

.... .0.. .... .... =3D Authoritative: Server is not an authority for =
domain

.... ..0. .... .... =3D Truncated: Message is not truncated

.... ...0 .... .... =3D Recursion desired: Don't do query recursively

.... .... 0... .... =3D Recursion available: Server can't do recursive =
queries

.... .... .0.. .... =3D Z: reserved (0)

.... .... ..0. .... =3D Answer authenticated: Answer/authority portion =
was not authenticated by the server

.... .... .... 0000 =3D Reply code: No error (0)

Questions: 1

Answer RRs: 0

Authority RRs: 4

Additional RRs: 4

Queries

vwall4a.nyc.gov: type A, class IN

Name: vwall4a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Authoritative nameservers

nyc.gov: type NS, class IN, ns vwall1a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall1a.nyc.gov

nyc.gov: type NS, class IN, ns vwall2a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall2a.nyc.gov

nyc.gov: type NS, class IN, ns vwall3a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall3a.nyc.gov

nyc.gov: type NS, class IN, ns vwall4a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall4a.nyc.gov

Additional records

vwall1a.nyc.gov: type A, class IN, addr 161.185.1.3

Name: vwall1a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Time to live: 1 day

Data length: 4

Addr: 161.185.1.3

vwall2a.nyc.gov: type A, class IN, addr 161.185.1.12

Name: vwall2a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Time to live: 1 day

Data length: 4

Addr: 161.185.1.12

vwall3a.nyc.gov: type A, class IN, addr 167.153.130.12

Name: vwall3a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Time to live: 1 day

Data length: 4

Addr: 167.153.130.12

vwall4a.nyc.gov: type A, class IN, addr 167.153.130.13

Name: vwall4a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Time to live: 1 day

Data length: 4

Addr: 167.153.130.13

BIND 9.6 query:

Domain Name System (query)

Transaction ID: 0x6427

Flags: 0x0000 (Standard query)

0... .... .... .... =3D Response: Message is a query

.000 0... .... .... =3D Opcode: Standard query (0)

.... ..0. .... .... =3D Truncated: Message is not truncated

.... ...0 .... .... =3D Recursion desired: Don't do query recursively

.... .... .0.. .... =3D Z: reserved (0)

.... .... ...0 .... =3D Non-authenticated data OK: Non-authenticated =
data is unacceptable

Questions: 1

Answer RRs: 0

Authority RRs: 0

Additional RRs: 1

Queries

vwall4a.nyc.gov: type A, class IN

Name: vwall4a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Additional records

<Root>: type OPT

Name: <Root>

Type: OPT (EDNS0 option)

UDP payload size: 512

Higher bits in extended RCODE: 0x0

EDNS0 version: 0

Z: 0x8000

Bit 0 (DO bit): 1 (Accepts DNSSEC security RRs)

Bits 1-15: 0x0 (reserved)

Data length: 0

BIND 9.6 response:

Domain Name System (response)

Transaction ID: 0x6427

Flags: 0x8000 (Standard query response, No error)

1... .... .... .... =3D Response: Message is a response

.000 0... .... .... =3D Opcode: Standard query (0)

.... .0.. .... .... =3D Authoritative: Server is not an authority for =
domain

.... ..0. .... .... =3D Truncated: Message is not truncated

.... ...0 .... .... =3D Recursion desired: Don't do query recursively

.... .... 0... .... =3D Recursion available: Server can't do recursive =
queries

.... .... .0.. .... =3D Z: reserved (0)

.... .... ..0. .... =3D Answer authenticated: Answer/authority portion =
was not authenticated by the server

.... .... .... 0000 =3D Reply code: No error (0)

Questions: 1

Answer RRs: 0

Authority RRs: 6

Additional RRs: 1

Queries

vwall4a.nyc.gov: type A, class IN

Name: vwall4a.nyc.gov

Type: A (Host address)

Class: IN (0x0001)

Authoritative nameservers

nyc.gov: type NS, class IN, ns vwall1a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall1a.nyc.gov

nyc.gov: type NS, class IN, ns vwall2a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall2a.nyc.gov

nyc.gov: type NS, class IN, ns vwall3a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall3a.nyc.gov

nyc.gov: type NS, class IN, ns vwall4a.nyc.gov

Name: nyc.gov

Type: NS (Authoritative name server)

Class: IN (0x0001)

Time to live: 1 day

Data length: 10

Name server: vwall4a.nyc.gov

rq2651faaj4nen6tfis8ju5005qccn8j.gov: type Unknown (50), class IN

Name: rq2651faaj4nen6tfis8ju5005qccn8j.gov

Type: Unknown (50)

Class: IN (0x0001)

Time to live: 1 day

Data length: 35

Data

rq2651faaj4nen6tfis8ju5005qccn8j.gov: type RRSIG, class IN

Name: rq2651faaj4nen6tfis8ju5005qccn8j.gov

Type: RRSIG (RR signature)

Class: IN (0x0001)

Time to live: 1 day

Data length: 279

Type covered: Unknown (50)

Algorithm: Unknown (0x07)

Labels: 2

Original TTL: 1 day

Signature expiration: Feb 22, 2011 05:00:22.000000000

Time signed: Feb 17, 2011 05:00:22.000000000

Id of signing key(footprint): 47602

Signer's name: gov

Signature

Additional records

<Root>: type OPT

Name: <Root>

Type: OPT (EDNS0 option)

UDP payload size: 1472

Higher bits in extended RCODE: 0x0

EDNS0 version: 0

Z: 0x0

Data length: 0

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<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
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<DIV><FONT size=3D2 face=3DArial>Ryan,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Have you solved your problem?&nbsp; I =
have similar=20
problems. I run BIND 9.6..1-P3 on my Solaris 10 and can not resolve =
anything in=20
domain nyc.gov.&nbsp; One thing I noticed is:&nbsp; BIND 9.3 send query =
to=20
b.gov-servers.net with no Additional records and got a response=20
with&nbsp;&nbsp;A records for the nyc.gov NS servers in the Additional =
records;=20
but BIND 9.6 send query with type OPT Additional records and got a =
response with=20
also a type OPT but no A in the Additional records.&nbsp; So the BIND =
9.6 can=20
not find the IP addresses of the nyc.gov NS servers and therefore can =
not=20
resolve anything in that domain.&nbsp; Using options "<FONT=20
size=3D3>max-udp-size&nbsp; 512" and "edns-udp-size&nbsp; 512"&nbsp; =
does not=20
solve the&nbsp; problem.</FONT></FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>The following are the what I captured.&nbsp; =
Anyone have=20
any suggestions to solve the=20
problem?&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>Shaoquan Lin</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>BIND 9.3 query:</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial><SPAN lang=3DEN>
<P>Domain Name System (query)</P>
<P>Transaction ID: 0x94ca</P>
<P>Flags: 0x0000 (Standard query)</P>
<P>0... .... .... .... =3D Response: Message is a query</P>
<P>.000 0... .... .... =3D Opcode: Standard query (0)</P>
<P>.... ..0. .... .... =3D Truncated: Message is not truncated</P>
<P>.... ...0 .... .... =3D Recursion desired: Don't do query =
recursively</P>
<P>.... .... .0.. .... =3D Z: reserved (0)</P>
<P>.... .... ...0 .... =3D Non-authenticated data OK: Non-authenticated =
data is=20
unacceptable</P>
<P>Questions: 1</P>
<P>Answer RRs: 0</P>
<P>Authority RRs: 0</P>
<P>Additional RRs: 0</P>
<P>Queries</P>
<P>vwall4a.nyc.gov: type A, class IN</P>
<P>Name: vwall4a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>BIND 9.3 response:</P><SPAN lang=3DEN>
<P>Domain Name System (response)</P>
<P>Transaction ID: 0x94ca</P>
<P>Flags: 0x8000 (Standard query response, No error)</P>
<P>1... .... .... .... =3D Response: Message is a response</P>
<P>.000 0... .... .... =3D Opcode: Standard query (0)</P>

<P>.... .0.. .... .... =3D Authoritative: Server is not an authority for=


domain</P>
<P>.... ..0. .... .... =3D Truncated: Message is not truncated</P>
<P>.... ...0 .... .... =3D Recursion desired: Don't do query =
recursively</P>
<P>.... .... 0... .... =3D Recursion available: Server can't do =
recursive=20
queries</P>
<P>.... .... .0.. .... =3D Z: reserved (0)</P>
<P>.... .... ..0. .... =3D Answer authenticated: Answer/authority =
portion was not=20
authenticated by the server</P>
<P>.... .... .... 0000 =3D Reply code: No error (0)</P>
<P>Questions: 1</P>
<P>Answer RRs: 0</P>
<P>Authority RRs: 4</P>
<P>Additional RRs: 4</P>
<P>Queries</P>
<P>vwall4a.nyc.gov: type A, class IN</P>
<P>Name: vwall4a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Authoritative nameservers</P>
<P>nyc.gov: type NS, class IN, ns vwall1a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall1a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall2a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall2a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall3a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall3a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall4a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall4a.nyc.gov</P>
<P>Additional records</P>
<P>vwall1a.nyc.gov: type A, class IN, addr 161.185.1.3</P>
<P>Name: vwall1a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 4</P>
<P>Addr: 161.185.1.3</P>
<P>vwall2a.nyc.gov: type A, class IN, addr 161.185.1.12</P>
<P>Name: vwall2a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 4</P>
<P>Addr: 161.185.1.12</P>
<P>vwall3a.nyc.gov: type A, class IN, addr 167.153.130.12</P>
<P>Name: vwall3a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 4</P>
<P>Addr: 167.153.130.12</P>
<P>vwall4a.nyc.gov: type A, class IN, addr 167.153.130.13</P>
<P>Name: vwall4a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 4</P>
<P>Addr: 167.153.130.13</P></SPAN></SPAN></FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>BIND 9.6 query:</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><SPAN lang=3DEN>
<P>Domain Name System (query)</P>
<P>Transaction ID: 0x6427</P>
<P>Flags: 0x0000 (Standard query)</P>
<P>0... .... .... .... =3D Response: Message is a query</P>
<P>.000 0... .... .... =3D Opcode: Standard query (0)</P>
<P>.... ..0. .... .... =3D Truncated: Message is not truncated</P>
<P>.... ...0 .... .... =3D Recursion desired: Don't do query =
recursively</P>
<P>.... .... .0.. .... =3D Z: reserved (0)</P>
<P>.... .... ...0 .... =3D Non-authenticated data OK: Non-authenticated =
data is=20
unacceptable</P>
<P>Questions: 1</P>
<P>Answer RRs: 0</P>
<P>Authority RRs: 0</P>
<P>Additional RRs: 1</P>
<P>Queries</P>
<P>vwall4a.nyc.gov: type A, class IN</P>
<P>Name: vwall4a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Additional records</P>
<P>&lt;Root&gt;: type OPT</P>
<P>Name: &lt;Root&gt;</P>
<P>Type: OPT (EDNS0 option)</P>
<P>UDP payload size: 512</P>
<P>Higher bits in extended RCODE: 0x0</P>
<P>EDNS0 version: 0</P>
<P>Z: 0x8000</P>
<P>Bit 0 (DO bit): 1 (Accepts DNSSEC security RRs)</P>
<P>Bits 1-15: 0x0 (reserved)</P>
<P>Data length: 0</P>
<P>BIND 9.6 response:</P><SPAN lang=3DEN>
<P>Domain Name System (response)</P>
<P>Transaction ID: 0x6427</P>
<P>Flags: 0x8000 (Standard query response, No error)</P>
<P>1... .... .... .... =3D Response: Message is a response</P>
<P>.000 0... .... .... =3D Opcode: Standard query (0)</P>

<P>.... .0.. .... .... =3D Authoritative: Server is not an authority for=


domain</P>
<P>.... ..0. .... .... =3D Truncated: Message is not truncated</P>
<P>.... ...0 .... .... =3D Recursion desired: Don't do query =
recursively</P>
<P>.... .... 0... .... =3D Recursion available: Server can't do =
recursive=20
queries</P>
<P>.... .... .0.. .... =3D Z: reserved (0)</P>
<P>.... .... ..0. .... =3D Answer authenticated: Answer/authority =
portion was not=20
authenticated by the server</P>
<P>.... .... .... 0000 =3D Reply code: No error (0)</P>
<P>Questions: 1</P>
<P>Answer RRs: 0</P>
<P>Authority RRs: 6</P>
<P>Additional RRs: 1</P>
<P>Queries</P>
<P>vwall4a.nyc.gov: type A, class IN</P>
<P>Name: vwall4a.nyc.gov</P>
<P>Type: A (Host address)</P>
<P>Class: IN (0x0001)</P>
<P>Authoritative nameservers</P>
<P>nyc.gov: type NS, class IN, ns vwall1a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall1a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall2a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall2a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall3a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall3a.nyc.gov</P>
<P>nyc.gov: type NS, class IN, ns vwall4a.nyc.gov</P>
<P>Name: nyc.gov</P>
<P>Type: NS (Authoritative name server)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 10</P>
<P>Name server: vwall4a.nyc.gov</P>
<P>rq2651faaj4nen6tfis8ju5005qccn8j.gov: type Unknown (50), class IN</P>
<P>Name: rq2651faaj4nen6tfis8ju5005qccn8j.gov</P>
<P>Type: Unknown (50)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 35</P>
<P>Data</P>
<P>rq2651faaj4nen6tfis8ju5005qccn8j.gov: type RRSIG, class IN</P>
<P>Name: rq2651faaj4nen6tfis8ju5005qccn8j.gov</P>
<P>Type: RRSIG (RR signature)</P>
<P>Class: IN (0x0001)</P>
<P>Time to live: 1 day</P>
<P>Data length: 279</P>
<P>Type covered: Unknown (50)</P>
<P>Algorithm: Unknown (0x07)</P>
<P>Labels: 2</P>
<P>Original TTL: 1 day</P>
<P>Signature expiration: Feb 22, 2011 05:00:22.000000000</P>
<P>Time signed: Feb 17, 2011 05:00:22.000000000</P>
<P>Id of signing key(footprint): 47602</P>
<P>Signer's name: gov</P>
<P>Signature</P>
<P>Additional records</P>
<P>&lt;Root&gt;: type OPT</P>
<P>Name: &lt;Root&gt;</P>
<P>Type: OPT (EDNS0 option)</P>
<P>UDP payload size: 1472</P>
<P>Higher bits in extended RCODE: 0x0</P>
<P>EDNS0 version: 0</P>
<P>Z: 0x0</P>
<P>Data length: 0</P></SPAN></SPAN></DIV></BODY></HTML>

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PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org



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Re: [SOLVED] Re: BIND9 SERVFAIL on some .gov addresses

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