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5.0

DNS working but .GOV sites will not resolve intermittantly

Asked by Technodweeb in Miscellaneous Networking, Internet Protocols, Domain Name Service (DNS)

Tags: dns, resolve, sites

Yes, all other TLD's as far as I can tell are resolving fine when this happens but after a few days of operating normally, the DNS will simply not resolve any site with a .GOV TLD. The client figured out that if it happens, they can just reboot and it fixes the problem. This does not assist in understanding what the problem is, however. I originally was told by the client that the firewall (ISA 2000) was blocking access but I was never able to find any logs that indicated this was true.

I was finally called when it occurred after hours and I was immediately able to determine the problem was with DNS. There are no errors being logged and I can figure out no reason for this to be occurring. If I restart the DNS service, all is fine for a few days and then we are back to square one.

I have turned on DNS Debug Logging and I am going to hold my breath that this log file may capture some vital data so I can put my finger directly on the source of the problem. I am including the first resolution logged to the main site the office visits regularly as an example.

Question 1: What would be the best items to log in the debugging to be able to track the specific problem and what would I look for?

Question 2: Anyone have a specific answer to solve this problem without having to go through the debug effort?

This is a SBS2003. There have been no DNS changes done since the original install. I will split points if necessary for good info.

Thank You in Advance for your insight...
Gregory A. Miller
a.k.a. Technodweeb


Example of a working query to "http://pacer.psc.uscourts.gov/":

16:22:22 DA0 PACKET  UDP Snd 209.97.207.48   3a1c   Q [0000       NOERROR] (6)lsmns1(4)gtwy(8)uscourts(3)gov(0)
UDP question info at 01BEA360
  Socket = 408
  Remote addr 209.97.207.48, port 53
  Time Query=0, Queued=0, Expire=0
  Buf length = 0x0500 (1280)
  Msg length = 0x0035 (53)
  Message:
    XID       0x3a1c
    Flags     0x0000
      QR        0 (QUESTION)
      OPCODE    0 (QUERY)
      AA        0
      TC        0
      RD        0
      RA        0
      Z         0
      RCODE     0 (NOERROR)
    QCOUNT    1
    ACOUNT    0
    NSCOUNT   0
    ARCOUNT   1
    QUESTION SECTION:
    Offset = 0x000c, RR count = 0
    Name      "(6)lsmns1(4)gtwy(8)uscourts(3)gov(0)"
      QTYPE   A (1)
      QCLASS  1
    ANSWER SECTION:
      empty
    AUTHORITY SECTION:
      empty
    ADDITIONAL SECTION:
    Offset = 0x002a, RR count = 0
    Name      "(0)"
      TYPE   OPT  (41)
      CLASS  1280
      TTL    0
      DLEN   0
      DATA   (none)

16:22:22 12C8 PACKET  UDP Snd 207.41.14.62    3a1c   Q [0000       NOERROR] (6)lsmns1(4)gtwy(8)uscourts(3)gov(0)
UDP question info at 01BEA360
  Socket = 408
  Remote addr 207.41.14.62, port 53
  Time Query=0, Queued=0, Expire=0
  Buf length = 0x0500 (1280)
  Msg length = 0x0035 (53)
  Message:
    XID       0x3a1c
    Flags     0x0000
      QR        0 (QUESTION)
      OPCODE    0 (QUERY)
      AA        0
      TC        0
      RD        0
      RA        0
      Z         0
      RCODE     0 (NOERROR)
    QCOUNT    1
    ACOUNT    0
    NSCOUNT   0
    ARCOUNT   1
    QUESTION SECTION:
    Offset = 0x000c, RR count = 0
    Name      "(6)lsmns1(4)gtwy(8)uscourts(3)gov(0)"
      QTYPE   A (1)
      QCLASS  1
    ANSWER SECTION:
      empty
    AUTHORITY SECTION:
      empty
    ADDITIONAL SECTION:
    Offset = 0x002a, RR count = 0
    Name      "(0)"
      TYPE   OPT  (41)
      CLASS  1280
      TTL    0
      DLEN   0
      DATA   (none)

16:22:22 12C8 PACKET  UDP Snd 207.41.18.68    0224   Q [0000       NOERROR] (5)pacer(3)psc(8)uscourts(3)gov(0)
UDP question info at 01BBAC90
  Socket = 408
  Remote addr 207.41.18.68, port 53
  Time Query=0, Queued=0, Expire=0
  Buf length = 0x0500 (1280)
  Msg length = 0x0033 (51)
  Message:
    XID       0x0224
    Flags     0x0000
      QR        0 (QUESTION)
      OPCODE    0 (QUERY)
      AA        0
      TC        0
      RD        0
      RA        0
      Z         0
      RCODE     0 (NOERROR)
    QCOUNT    1
    ACOUNT    0
    NSCOUNT   0
    ARCOUNT   1
    QUESTION SECTION:
    Offset = 0x000c, RR count = 0
    Name      "(5)pacer(3)psc(8)uscourts(3)gov(0)"
      QTYPE   A (1)
      QCLASS  1
    ANSWER SECTION:
      empty
    AUTHORITY SECTION:
      empty
    ADDITIONAL SECTION:
    Offset = 0x0028, RR count = 0
    Name      "(0)"
      TYPE   OPT  (41)
      CLASS  1280
      TTL    0
      DLEN   0
      DATA   (none)

16:22:22 12C8 PACKET  UDP Snd 192.168.16.2    a7bd R Q [0084 A     NOERROR] (5)pacer(3)psc(8)uscourts(3)gov(0)
UDP response info at 007E7AD0
  Socket = 392
  Remote addr 192.168.16.2, port 44152
  Time Query=453506, Queued=0, Expire=0
  Buf length = 0x0500 (1280)
  Msg length = 0x0087 (135)
  Message:
    XID       0xa7bd
    Flags     0x8400
      QR        1 (RESPONSE)
      OPCODE    0 (QUERY)
      AA        1
      TC        0
      RD        0
      RA        0
      Z         0
      RCODE     0 (NOERROR)
    QCOUNT    1
    ACOUNT    1
    NSCOUNT   2
    ARCOUNT   2
    QUESTION SECTION:
    Offset = 0x000c, RR count = 0
    Name      "(5)pacer(3)psc(8)uscourts(3)gov(0)"
      QTYPE   A (1)
      QCLASS  1
    ANSWER SECTION:
    Offset = 0x0028, RR count = 0
    Name      "[C00C](5)pacer(3)psc(8)uscourts(3)gov(0)"
      TYPE   A  (1)
      CLASS  1
      TTL    3600
      DLEN   4
      DATA   207.41.15.138
    AUTHORITY SECTION:
    Offset = 0x0038, RR count = 0
    Name      "[C016](8)uscourts(3)gov(0)"
      TYPE   NS  (2)
      CLASS  1
      TTL    3600
      DLEN   14
      DATA   (6)resns1(4)gtwy[C016](8)uscourts(3)gov(0)
    Offset = 0x0052, RR count = 1
    Name      "[C016](8)uscourts(3)gov(0)"
      TYPE   NS  (2)
      CLASS  1
      TTL    3600
      DLEN   9
      DATA   (6)lsmns1[C04B](4)gtwy[C016](8)uscourts(3)gov(0)
    ADDITIONAL SECTION:
    Offset = 0x0067, RR count = 0
    Name      "[C05E](6)lsmns1[C04B](4)gtwy[C016](8)uscourts(3)gov(0)"
      TYPE   A  (1)
      CLASS  1
      TTL    3600
      DLEN   4
      DATA   207.41.18.68
    Offset = 0x0077, RR count = 1
    Name      "[C044](6)resns1(4)gtwy[C016](8)uscourts(3)gov(0)"
      TYPE   A  (1)
      CLASS  1
      TTL    3600
      DLEN   4
      DATA   207.41.14.62
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About this solution

Zones: Miscellaneous Networking, Internet Protocols, Domain Name Service (DNS)
Tags: dns, resolve, sites
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Solution Provided By: Netminder
Participating Experts: 3
Solution Grade: B
 
 
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