Wireless domain clients can no longer see wired domain clients

We just migrated from a SBS2003, providing DHCP and DNS smong other services,  to Windows 2008 R2. The migration went well except for the fact that our wireless workstations which get their IP address via DHCP from a CISCO E3000 router can no longer see the wired domain workstations on the LAN. There was no issue when the domain controller was the SBS2003.

Here's what is known. Wired domain workstations can be pinged via the IP address but not the hostname. The DC can be pinged via IP address and hostname but cannot be "Seen" as part of the network.

I've have applied a few patches as suggested from the web, but so far nothing has resolved this problem. I have a feeling it is a relatively easy fix; just do not know what it is.
rpbishipAsked:
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Steven CarnahanNetwork ManagerCommented:
...can be pinged via the IP address but not the hostname.
usually indicates a DNS issue.  Are both wired and wireless pointed to the same DNS server?

DC can be pinged via IP address and hostname but cannot be "Seen"

Please refer to this Microsoft article:  https://support.microsoft.com/en-us/kb/2722035
rpbishipAuthor Commented:
Yes. At first they were not, but changing that still has not yielded the result we're looking for.
Craig BeckCommented:
Domain clients should use the DC for DNS. That means you have to use the DC for DHCP too as the Cisco router can't integrate with DNS properly.

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footechCommented:
That would be my recommendation as well.

I find little value in being able to see all machines through the "Network" item in Windows Explorer.  I would troubleshoot that independently of any issues with connecting to and/or pinging hosts by their name.  I'm not quite clear on which issue you're trying to resolve, being able to connect/ping via name, or just seeing the names under Network.
rpbishipAuthor Commented:
I'll pursue using the DC for DHCP for wireless clients. As to our reasoning; it is not so much that they can see each other as it is a matter of being able to see shared files on the file server.
footechCommented:
So then you're saying your real problem is that wireless clients can't connect to the file server, but that wired clients can?
Craig BeckCommented:
Yes, that's the issue because the clients are trying to use DNS to see shares rather than NetBIOS, especially if the server is on a different subnet.
rpbishipAuthor Commented:
The ultimate solution actually was to ensure that the E3000 router merely acted as an access point. Even disabling the DHCP as suggested did not completely resolve the problem as the router still assigned itself as the gateway when it actually needed to pass through the real gateway address. This was accomplished by making sure that the wired connection to the E3000 was plugged into a LAN port and not the Internet port. Once done, along with disabling the DHCP and pointing to the proper DNS server was the answer. Thanks for the assist.
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