Hi,
I'm a bit clueless about what's happening here exactly.
I have a server (9.6.1-P3) that tries resolving
ws.mobilecdn.verisign.com. Queries for this host permanently fail with
SERVFAIL.
I've narrowed the problem down to answers from c2.nstld.net
dig @c2.nstld.com mobilecdn.verisign.com
;; Got referral reply from 192.26.92.31, trying next server
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.1 <<>> @c2.nstld.com
mobilecdn.verisign.com ; (2 servers found)
;; global options: printcmd
;; connection timed out; no servers could be reached
This happens only if the hostname is used in a dig. Using the ipv4
address everything turns out fine.
What's even more strange is the answer packet received (at least I
can't see any errors there).
No. Time Source Destination
Protocol Info 4 3.529927 192.26.92.31 10.10.3.22
DNS Standard query response
Frame 4 (140 bytes on wire, 140 bytes captured)
Arrival Time: Mar 9, 2010 13:33:49.987181000
[Time delta from previous captured frame: 0.086282000 seconds]
[Time delta from previous displayed frame: 0.086282000 seconds]
[Time since reference or first frame: 3.529927000 seconds]
Frame Number: 4
Frame Length: 140 bytes
Capture Length: 140 bytes
[Frame is marked: True]
[Protocols in frame: eth:ip:udp:dns]
[Coloring Rule Name: UDP]
[Coloring Rule String: udp]
Ethernet II, Src: Cisco_46:45:d3 (00:04:27:46:45:d3), Dst:
HewlettP_08:78:76 (00:1f:29:08:78:76) Destination: HewlettP_08:78:76
(00:1f:29:08:78:76) Address: HewlettP_08:78:76 (00:1f:29:08:78:76)
.... ...0 .... .... .... .... = IG bit: Individual address
(unicast) .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default) Source: Cisco_46:45:d3 (00:04:27:46:45:d3)
Address: Cisco_46:45:d3 (00:04:27:46:45:d3)
.... ...0 .... .... .... .... = IG bit: Individual address
(unicast) .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default) Type: IP (0x0800)
Internet Protocol, Src: 192.26.92.31 (192.26.92.31), Dst: 10.10.3.22
(10.10.3.22) Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 126
Identification: 0x0000 (0)
Flags: 0x02 (Don't Fragment)
0.. = Reserved bit: Not Set
.1. = Don't fragment: Set
..0 = More fragments: Not Set
Fragment offset: 0
Time to live: 58
Protocol: UDP (0x11)
Header checksum: 0x1716 [correct]
[Good: True]
[Bad : False]
Source: 192.26.92.31 (192.26.92.31)
Destination: 10.10.3.22 (10.10.3.22)
User Datagram Protocol, Src Port: domain (53), Dst Port: 48885 (48885)
Source port: domain (53)
Destination port: 48885 (48885)
Length: 106
Checksum: 0x1190 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Domain Name System (response)
[Request In: 3]
[Time: 0.086282000 seconds]
Transaction ID: 0x3824
Flags: 0x8100 (Standard query response, No error)
1... .... .... .... = Response: Message is a response
.000 0... .... .... = Opcode: Standard query (0)
.... .0.. .... .... = Authoritative: Server is not an authority
for domain .... ..0. .... .... = Truncated: Message is not truncated
.... ...1 .... .... = Recursion desired: Do query recursively
.... .... 0... .... = Recursion available: Server can't do
recursive queries .... .... .0.. .... = Z: reserved (0)
.... .... ..0. .... = Answer authenticated: Answer/authority
portion was not authenticated by the server .... .... .... 0000 = Reply
code: No error (0) Questions: 1
Answer RRs: 0
Authority RRs: 2
Additional RRs: 0
Queries
ws.mobilecdn.verisign.com: type A, class IN
Name: ws.mobilecdn.verisign.com
Type: A (Host address)
Class: IN (0x0001)
Authoritative nameservers
mobilecdn.verisign.com: type NS, class IN, ns
dns2-auth.m-qube.com Name: mobilecdn.verisign.com
Type: NS (Authoritative name server)
Class: IN (0x0001)
Time to live: 15 minutes
Data length: 19
Name server: dns2-auth.m-qube.com
mobilecdn.verisign.com: type NS, class IN, ns
dns1-auth.m-qube.com Name: mobilecdn.verisign.com
Type: NS (Authoritative name server)
Class: IN (0x0001)
Time to live: 15 minutes
Data length: 12
Name server: dns1-auth.m-qube.com
Asking any of the other nameservers responsible for
verisign.com about mobilecdn.verisign.com works just fine and they all
return with a proper answer.
As a workaround I have set c2.nstld.net to bogus but I'm still unsure
what the real cause for this problem is.
Any ideas?
Ciao
Torsten
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