Some machines not getting dns

[Azhibberd]

Hey guys,
Sorry i'm getting a sore head from this one.... So here goes... Server that does DHCP decided to crash out monday night, So came in tuesday restarted it, wasn't giving out ip addresses, Turned off the old wds that was on it, then bound the ip address so it could then give out ip addresses, then everywhere is getting IP addresses again... but now some machines are getting a usable dns and some arn't, We have 2 dns servers both seem to be happy(Can use nslookup on both of them and seems to resolve fine)

Some of the machines (Doesn't seem to be a pattern what so ever) and when i say some we have 3 IT rooms that have 30 machines each that are doing as they should, where as some of them only get 3 working out of the 30(Whose that arn't working are receiving "there are currently no logon servers available to service the logon request")

Now doing dcdiag /testNS does give me:

C:\Program Files\Support Tools>dcdiag /test:dns

Domain Controller Diagnosis

Performing initial setup:
   Done gathering initial info.

Doing initial required tests

   Testing server: Default-First-Site-Name\STAFF-SERVER
      Starting test: Connectivity
         ......................... STAFF-SERVER passed test Connectivity

Doing primary tests

   Testing server: Default-First-Site-Name\STAFF-SERVER

DNS Tests are running and not hung. Please wait a few minutes...

   Running partition tests on : DomainDnsZones

   Running partition tests on : ForestDnsZones

   Running partition tests on : Schema

   Running partition tests on : Configuration

   Running partition tests on : nsnet

   Running enterprise tests on : nsnet.net
      Starting test: DNS
         Test results for domain controllers:

            DC: Staff-Server.nsnet.net
            Domain: nsnet.net


               TEST: Forwarders/Root hints (Forw)
                  Error: Root hints list has invalid root hint server: a.root-se
rvers.net. (198.41.0.4)
                  Error: Root hints list has invalid root hint server: b.root-se
rvers.net. (192.228.79.201)
                  Error: Root hints list has invalid root hint server: c.root-se
rvers.net. (192.33.4.12)
                  Error: Root hints list has invalid root hint server: d.root-se
rvers.net. (128.8.10.90)
                  Error: Root hints list has invalid root hint server: e.root-se
rvers.net. (192.203.230.10)
                  Error: Root hints list has invalid root hint server: f.root-se
rvers.net. (192.5.5.241)
                  Error: Root hints list has invalid root hint server: g.root-se
rvers.net. (192.112.36.4)
                  Error: Root hints list has invalid root hint server: h.root-se
rvers.net. (128.63.2.53)
                  Error: Root hints list has invalid root hint server: i.root-se
rvers.net. (192.36.148.17)
                  Error: Root hints list has invalid root hint server: j.root-se
rvers.net. (192.58.128.30)
                  Error: Root hints list has invalid root hint server: k.root-se
rvers.net. (193.0.14.129)
                  Error: Root hints list has invalid root hint server: l.root-se
rvers.net. (199.7.83.42)
                  Error: Root hints list has invalid root hint server: m.root-se
rvers.net. (202.12.27.33)

               TEST: Dynamic update (Dyn)
                  Warning: Dynamic update is enabled on the zone but not secure
nsnet.net.

         Summary of test results for DNS servers used by the above domain contro
llers:

            DNS server: 128.63.2.53 (h.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 128.63.2.53

            DNS server: 128.8.10.90 (d.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 128.8.10.90

            DNS server: 192.112.36.4 (g.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.112.36.4

            DNS server: 192.203.230.10 (e.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.203.230.10

            DNS server: 192.228.79.201 (b.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.228.79.201

            DNS server: 192.33.4.12 (c.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.33.4.12

            DNS server: 192.36.148.17 (i.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.36.148.17

            DNS server: 192.5.5.241 (f.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.5.5.241

            DNS server: 192.58.128.30 (j.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 192.58.128.30

            DNS server: 193.0.14.129 (k.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 193.0.14.129

            DNS server: 198.41.0.4 (a.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 198.41.0.4

            DNS server: 199.7.83.42 (l.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 199.7.83.42

            DNS server: 202.12.27.33 (m.root-servers.net.)
               1 test failure on this DNS server
               This is not a valid DNS server. PTR record query for the 1.0.0.12
7.in-addr.arpa. failed on the DNS server 202.12.27.33

         Summary of DNS test results:

                                            Auth Basc Forw Del  Dyn  RReg Ext
               ________________________________________________________________
            Domain: nsnet.net
               Staff-Server                 PASS PASS FAIL PASS WARN PASS n/a

         ......................... nsnet.net failed test DNS

Now i'm not exactly sure where to go from here.... Any help would be much appreciated!

[plexer]

What does just dcdiag give?

Ben

[Azhibberd]

Domain Controller Diagnosis

Performing initial setup:
   Done gathering initial info.

Doing initial required tests
   
   Testing server: Default-First-Site-Name\STUDENT-SERVER
      Starting test: Connectivity
         ......................... STUDENT-SERVER passed test Connectivity

Doing primary tests
   
   Testing server: Default-First-Site-Name\STUDENT-SERVER
      Starting test: Replications
         ......................... STUDENT-SERVER passed test Replications
      Starting test: NCSecDesc
         ......................... STUDENT-SERVER passed test NCSecDesc
      Starting test: NetLogons
         ......................... STUDENT-SERVER passed test NetLogons
      Starting test: Advertising
         ......................... STUDENT-SERVER passed test Advertising
      Starting test: KnowsOfRoleHolders
         ......................... STUDENT-SERVER passed test KnowsOfRoleHolders
      Starting test: RidManager
         ......................... STUDENT-SERVER passed test RidManager
      Starting test: MachineAccount
         ......................... STUDENT-SERVER passed test MachineAccount
      Starting test: Services
         ......................... STUDENT-SERVER passed test Services
      Starting test: ObjectsReplicated
         ......................... STUDENT-SERVER passed test ObjectsReplicated
      Starting test: frssysvol
         ......................... STUDENT-SERVER passed test frssysvol
      Starting test: frsevent
         ......................... STUDENT-SERVER passed test frsevent
      Starting test: kccevent
         ......................... STUDENT-SERVER passed test kccevent
      Starting test: systemlog
         ......................... STUDENT-SERVER passed test systemlog
      Starting test: VerifyReferences
         ......................... STUDENT-SERVER passed test VerifyReferences
   
   Running partition tests on : DomainDnsZones
      Starting test: CrossRefValidation
         ......................... DomainDnsZones passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... DomainDnsZones passed test CheckSDRefDom
   
   Running partition tests on : ForestDnsZones
      Starting test: CrossRefValidation
         ......................... ForestDnsZones passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... ForestDnsZones passed test CheckSDRefDom
   
   Running partition tests on : Schema
      Starting test: CrossRefValidation
         ......................... Schema passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Schema passed test CheckSDRefDom
   
   Running partition tests on : Configuration
      Starting test: CrossRefValidation
         ......................... Configuration passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... Configuration passed test CheckSDRefDom
   
   Running partition tests on : nsnet
      Starting test: CrossRefValidation
         ......................... nsnet passed test CrossRefValidation
      Starting test: CheckSDRefDom
         ......................... nsnet passed test CheckSDRefDom
   
   Running enterprise tests on : nsnet.net
      Starting test: Intersite
         ......................... nsnet.net passed test Intersite
      Starting test: FsmoCheck
         ......................... nsnet.net passed test FsmoCheck

2 DC's give that... One is giving an error about systemlog

Just to add something i noticed odd... on one of the clients that isn't playing ball i ran nslookup and i get

Default Server: Unknown
Address: 172.16.0.10

> student-server
Server: Unknown
Address 172.16.0.10

Name: Student-server.nsnet.net
Address: 172.16.0.10

[Azhibberd]

Just been playing for abit and one machine we had working fine, with the machine next to it (on the same switch and vlan) refusing to see anything not on the same vlan could ping machines on its vlan and nothing outside its vlan, then 5 minutes later the one that was fine has stopped being able to see anything not on its vlan, Hence i'm guessings its not dns related, looked at the logs on the switch there on doesn't seem to be any problems... And well its not just that switch its happening on, Anyone got any bright ideas i should be looking at? Think next step is wait till end of the day and restart the core switch.. ?

**Looks like it was something really odd going on with the core switch, As a restart off that seems to have resolved the issues, Although we shall find out tomorrow**

[CHR1S]

Corrupted Routing Table on the core switch due to the DHCP failing?

Clutching at straws really, ill let the more experienced networking people correct my above statement