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SBS2011, Linksys EA4500, Client DNS Resolution Problem

Posted on 2012-12-28
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Last Modified: 2013-01-02
I got called into this SBS2011 setup after the fact, i.e., someone else tried, ran into a dead end, then they called me. ISP is Cbeyond. Their IAD connects to the WAN port of the EA4500. The LAN side of the EA4500 is the local network and the server is connected to one of the EA4500 LAN ports. Server TCP/IP config is set manually, correctly pointing to itself as the DNS server and it can surf just fine. Server is also the LAN DHCP server with the DHCP server in the EA4500 disabled. A client plugged into one of the EA4500 LAN ports gets what appears to be the exact same TCP/IP config as the manual params set in the server, but the clients cannot resolve public DNS names. I CAN ping the server by name from a client.

If I put the ip address of, say, google.com in the address bar of the client, it can display the web site. If I manually enter the public IP address of the Cbeyond DNS server in the tcp/ip settings, the client will surf. But with just the server address as the DNS address for the clients, they won't surf (they should).

I have included the ipconfig /all from both the server and a client below. Any pointers on this one??? Thanks.

server ipconfig /all

   Host Name . . . . . . . . . . . . : VETERANSPSERVER
   Primary Dns Suffix  . . . . . . . : veteransplum.local
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : veteransplum.local

Ethernet adapter Local Area Connection 2:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connectio
n
   Physical Address. . . . . . . . . : 2C-27-D7-14-EC-C2
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::e52b:56f:ab43:6a5f%13(Preferred)
   Link-local IPv6 Address . . . . . : fe80::e865:25a1:c4ed:38f9%13(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 304883671
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-5F-C6-8A-44-1E-A1-6E-0E-CC

   DNS Servers . . . . . . . . . . . : fe80::e865:25a1:c4ed:38f9%13
                                       192.168.1.2
   NetBIOS over Tcpip. . . . . . . . : Enabled

client ipconfig /all

   Host Name . . . . . . . . . . . . : RobinG
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : veteransplum.local

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : veteransplum.local
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : B8-88-E3-37-CB-5F
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::9cd5:3987:507a:45db%12(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.12(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Friday, December 28, 2012 10:00:38 AM
   Lease Expires . . . . . . . . . . : Saturday, January 05, 2013 10:09:42 AM
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.2
   DHCPv6 IAID . . . . . . . . . . . : 347637987
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-B4-BF-BE-E0-06-E6-C2-F1-EE

   DNS Servers . . . . . . . . . . . : 192.168.1.2
   NetBIOS over Tcpip. . . . . . . . : Enabled

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Question by:tcianflone
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Expert Comment

by:binumicrosoft
ID: 38727365
The Information listed shows, 2 NICS in the Server... ?? Disable One NIC, keep the primary NIC enabled. Also make sure the Binding Order in Network Connections on the server is fine.

Primary NIC should be Primary in the Binding.

After making those changes, do an ipconfig /flushdns
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tcianflone earned 0 total points
ID: 38728237
Found similar references to this problem elsewhere and they referenced this kb article:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;968372

As per the article, I made the reg edit, restarted DNS server, cleared cache and the clients starting working immediately. Still, why would the server work fine using the same DNS server as the clients but not the clients??? Anyways, it's fixed for now. Also found some useful information about using reliable DNS forwarders here on EE:
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/SBS_Small_Business_Server/Q_27673569.html
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Author Closing Comment

by:tcianflone
ID: 38736041
Found the answer before I got a post from another user that was useful.
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