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Network PC's and Wireless clients not getting Gateway IP

Posted on 2014-10-29
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Last Modified: 2014-11-02
The network server is Server 2008, 2 Nics (1 Disabled).
The ip of server is hard coded 192.168.1.2, with gateway of 192.168.1.1 (Router). And DNS at 192.168.1.2 (pointing to self)

Had regular gigabit router with no wireless builtin in place. Used an access Point. Wireless devices cannot get the gateway IP. Some hard wired PC's get limited connection at random intervals. Devices look and have been verified to be setup correctly.

Changed router to gigabit Netgear FVS318N wireless router, and same conditions, wireless clients do not get a gateway ip when connected but connect limited only. Some PC's do the same, limited connections, and if hard coded with the ip information, will work, but not permanently, they eventually get limited connection.

Phones do not pick up the gateway IP.

The router has been replaced, the switch has been replaced, Server is doing DNS and DHCP, and they are off in the wireless router.

We have 1 server, 5 pc's, 1 mfp printer. I have seen today all working, then my pc dropped the dns, connection said limited, 3 users on exchange showed disconnected, then came back shortly afterwards by themselves.

I have scanned for bugs on all, including server. Any ideas?
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Question by:kevinecaldwell
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21 Comments
 
LVL 34

Expert Comment

by:it_saige
ID: 40411321
It almost sounds as if you have a loopback problem on the network somewhere.  Ensure that the switch and router are just connected to each other with one cable.

Also please provide the output for: netsh interface ipv4 show config

From one of the computers with a limited connection.

-saige-
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LVL 6

Expert Comment

by:Wylie Bayes
ID: 40411431
What is acting as DHCP server?  The 2008 machine or the router?
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LVL 10

Expert Comment

by:tmoore1962
ID: 40411524
switch managed or unmanaged? If managed make sure it is configured.  Check your DHCP config for scope options on the server and make sure your dns and router are configured there.  Since exchange is it a SBS server?  Anything in the eventlogs?  When system has limited do a IPCONFIG /ALL  and see if information is correct. Also does tracert to a web address work?
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Author Comment

by:kevinecaldwell
ID: 40411534
I had to leave the site for another emergency.  I will check these things out in a little while.

The 2008 server is doing dhcp.
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Author Comment

by:kevinecaldwell
ID: 40411719
ipconfig shows when limited, it is not getting the gateway IP as mentioned above.. I see an IP, the the subnet, but the g/w is blank. When it works as it should, it shows the gateway,, I can ALWAYS ping the router on .1 and the server on .2 even when limited.

This box is an exchange server as mentioned too. It is a managed switch, but I have not set it up, the previous IT source did, but it has been crazy up and down for a couple of months now.. It was working fine for a long time.
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Author Comment

by:kevinecaldwell
ID: 40411789
the switch is connected to the router one cable, from port 2 from router to the uplink port in the managed switch..
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LVL 6

Expert Comment

by:Asif Bacchus
ID: 40411999
I noted that you are using SBS?  If that's the case then you REALLY REALLY have to make sure that your NetGear router is not trying to act as the DHCP server.  SBS loves to be the DNS and DHCP server and gets very angry when it is not.  I've used the router you mentioned and there are several places to disable DHCP, so make sure you take a good look around.  Also, are you sure that the SBS is handing out gateway information in the DHCP scope/server options?  I've seen the wizard forget to explicitly add the gateway in the scope options before.
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Author Comment

by:kevinecaldwell
ID: 40412052
R2 Standard Server 2008 is not SBS.. The server is set to dish out dhcp and dns,, the router is indeed turned off
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LVL 6

Expert Comment

by:Wylie Bayes
ID: 40412159
The 2008 server is also a domain controller yes?  Have you configured DHCP to use custom authentication when doing dynamic DNS updates?
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LVL 1

Expert Comment

by:Dale McKay
ID: 40412474
What is the configured lease time on the DHCP server?
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LVL 18

Assisted Solution

by:Akinsd
Akinsd earned 167 total points
ID: 40412618
Check your DHCP scopes on the server.

Also, run ipconfig /all on the computers and verify the DHCP server IP to ensure the devices are receiving DHCP offers from the correct server
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LVL 6

Expert Comment

by:Asif Bacchus
ID: 40412681
This seems like the lease is being prematurely ended and the clients are not renewing automatically.  Dale had a good suggestion on checking lease times.  Some output from an ipconfig /all would be very helpful.  Also, anything in the event logs either on the server (DHCP and DNS logs) or the client?
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LVL 11

Assisted Solution

by:hecgomrec
hecgomrec earned 166 total points
ID: 40414389
Open your DHCP on the server, under the IPv4:

Properties of the Scope:

General tab:

Start IP address: 192.168.1.30
End IP address:  192.168.1.254

Note: I leave 30 IP for static configuration of devices (printer, routers, servers, etc.)


Scope Options, make sure you have there:

003 Router = 192.168.1.1
006 DNS Servers = 192.168.1.2
015 DNS Domain Name = yourdomainname

Post back....
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LVL 1

Expert Comment

by:Dale McKay
ID: 40414761
What does you DHCP server say for a lease duration?

DHCP-Lease.jpg
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LVL 18

Expert Comment

by:Akinsd
ID: 40414949
Also, run ipconfig /all on the computers and verify the DHCP server IP to ensure the devices are receiving DHCP offers from the correct server

DHCP
This is to eliminate possibility of a DHCP rogue server
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LVL 1

Expert Comment

by:Dale McKay
ID: 40414974
It appears to me that you are getting your DHCP addresses from an AT&T Wi-Fi DHCP server located at 192.168.1.254. It is also the default gateway for the 192.168.1.0 network. That's why you see the DNS domain as attlocal.net. BTW,, the lease is for a day which is standard for an AT&T provided device.

On your server,, can we get the output of  the command ipconfig /all?

Can you also add screen shots of the DHCP server configuration?
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LVL 1

Expert Comment

by:Dale McKay
ID: 40414979
Never mind on the AT&T comment...it's been a long day.

Still would like to see the ipconfig /all from the server and screenshots of how the DHCP server is configured.
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LVL 6

Expert Comment

by:Asif Bacchus
ID: 40415043
I agree with Dale, ipconfig /all would be helpful along with his previously requested lease expiration times.  A screenshot of the scope options would also be very helpful to ensure that the proper gateway and DNS settings are being sent via DHCP.
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LVL 18

Expert Comment

by:Akinsd
ID: 40415091
I posted the ipconfig screenshot as an example for the author. Author is yet to post his result.
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LVL 46

Accepted Solution

by:
Craig Beck earned 167 total points
ID: 40416404
We need to know if the clients do actually get a gateway address, and that this isn't just a flaky DNS issue.

If clients have flaky DNS that would cause the Limited Connectivity issue, as a MS client tries to resolve www.msftncsi.com using its configured DNS server.  If it can't resolve that host's IP it will assume there is no internet connectivity.  If it can resolve that host's IP it will then try to down load file ncsi.txt from that address.  Again, if this fails the PC will assume there is no internet access available.
0
 

Author Closing Comment

by:kevinecaldwell
ID: 40418519
Experts,
As a temporary fix, I moved the dhcp to the router and everything worked then.  So something is definitely wrong with the dhcp and dns on the server.   This weekend I moved the mail to the cloud so that was a one thing off of the server that I didn't have to worry about as much.  I believe what needs to happens is just zap the whole dhcp and dns on the server and go from there.  At least the customer is not going up and down with things.  Interestingly enough too, all the machines were hard coded with ip's and not on automatic.  I believe the problem has been there for a while.  I started handling this customer only a few months ago.  So the previous IT guy never fixed this.    
Thanks for the help!
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