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networking - Linux clients and Windows Servers can connect but not windows clients

This is driving me insane because I can't make head or tails of it.



We have two DCs (W2K3 SP1) and I'v tried this once on each machine as a sanity check.



DHCP is being served by either one of the machines and all machines get an address no problem. The servers can connect/ping/browse to the www and so can all our linux clients. But NONE of our windows clients (all windows 7).



I can do anything within the network, I can even ping the firewall/router but nothing from the windows clients is leaving the confines of our subnet.



I don't get it. The linux and windows clients are both served from the same DHCP server, the gateway is the same, everything is the same.




Anyone care to take a shot at how to resolve this?



I tried adding explicit routes at the clients, but still no go.



Some points that might help:



This is behind a SonicWall firewall (which I absolutely despise).
The DCs are two VMs on two different boxes.
DHCP being provided by these VMs. There is maybe 1/2 dozen other VMs that act as web or database servers and they can all connect to the internet.
The issue happened this morning (my time is GMT +2) and I think its a result of issues on the VMs. The domain was built in what I can only kindly refer to as a patchy manner. Dealing with it is like running my cojones in a shredder.




Connection has proven to be an intermittent thing. On several of the Windows 7 clients, connection was restored for no obvious reason for a few minutes before it went away.



Nothing has been changed when it comes to domain policies for at least a few weeks now.



I can't think of anything else to add, but if there's something in specific, y'all just ask and I'll be more than happy to provide an answer.



TIA



SMIM




@John Gardeniers



I'm at home now so I'll post it tomorrow when I get to the office, but I did that when I was there and the gateway and DNS servers are right. DNS resolution is correct.



This is the ipconfig /all output on one of the clients that started to work magically after I turned off the DHCP



Windows IP Configuration

   Host Name . . . . . . . . . . . . : TAN-LEN-08

   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : tanasuk.lcl

********************************************************************
Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : tanasuk.lcl

   Description . . . . . . . . . . . : Intel(R) WiFi Link 5100 AGN
   Physical Address. . . . . . . . . : 00-21-5D-77-8F-D2
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::c864:eeb4:cb19:40cf%12(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.186.151(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Monday, January 17, 2011 9:48:50 AM
   Lease Expires . . . . . . . . . . : Monday, January 17, 2011 2:48:51 PM
   Default Gateway . . . . . . . . . : 192.168.186.1

                                       192.168.186.5
   DHCP Server . . . . . . . . . . . : 192.168.186.6
   DHCPv6 IAID . . . . . . . . . . . : 218112349
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-4F-8A-A2-00-22-15-EB-3B-2F

   DNS Servers . . . . . . . . . . . : 192.168.186.5
                                       192.168.186.6
   Primary WINS Server . . . . . . . : 192.168.186.6
   NetBIOS over Tcpip. . . . . . . . : Enabled
********************************************************************


Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Realtek RTL8168C(P)/8111C(P) Family PCI-E
 Gigabit Ethernet NIC (NDIS 6.20)
   Physical Address. . . . . . . . . : 00-22-15-EB-3B-2F
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes


Tunnel adapter Teredo Tunneling Pseudo-Interface:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes


Tunnel adapter isatap.tanasuk.lcl:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : tanasuk.lcl
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes



Obviously, the one I tagged with asterisks is the one we're looking at.



Its right, the gateway should be and is 192.168.186.1, the DNS servers are 192.168.186.5|6 everything is right.



The weird thing is that things started to work after DHCP server was turned off! In my exasperated attempts, I even tried a linux server (CentOS 5.3 dhcpd) with the exact same results.



Any idea guys? I'm stumped and I'd LOVE to know what the heck is going on.



Here is the ipconfig /all output off of one of the DCs/DNS servers




Windows IP Configuration

   Host Name . . . . . . . . . . . . : TAN-SRV-DC2
   Primary Dns Suffix  . . . . . . . : tanasuk.lcl
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : tanasuk.lcl

Ethernet adapter Local Area Connection 2:


   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Citrix XenServer PV Ethernet Adapter
   Physical Address. . . . . . . . . : A2-A9-A1-B4-FA-08
   DHCP Enabled. . . . . . . . . . . : No
   IP Address. . . . . . . . . . . . : 192.168.186.6
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.186.1
   DNS Servers . . . . . . . . . . . : 192.168.186.5
                                       192.168.186.6



and this is off of my local linux laptop (ifconfig eth0)



eth0      Link encap:Ethernet  HWaddr 00:16:6f:55:07:e3  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:304 errors:0 dropped:0 overruns:0 frame:0
          TX packets:61 errors:0 dropped:5 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:47811 (47.8 KB)  TX bytes:12238 (12.2 KB)

          Interrupt:22 Memory:bc007000-bc007fff


(less /etc/resolv.conf)



# Generated by NetworkManager
nameserver 192.168.186.5
nameserver 192.168.186.6



and (route -n output)



Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.186.0   0.0.0.0         255.255.255.0   U     1      0        0 eth1
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth1
0.0.0.0         192.168.186.1   0.0.0.0         UG    0      0        0 eth1



As you can see, this is insane!



There is something I have noticed since the problem has now become intermittent. Some Windows 7 laptops will connect, others will not and some will connect for a bit and then just forget.



They connect perfectly fine locally. And though they have a gateway defined, its almost as if they don't know how to reach it. Trying a tracert, I get a timeout from the first hop, but not so on the *nix clients (CentOS, several Ubuntu, several Mac OS X). Could this be a DNS issue? as in both DCs aren't synching properly?

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