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Network Error related to network switches ?

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Last Modified: 2012-08-13
Hi Experts,

I have a problem regarding our local network setup. We had a power outage recently, which i think may have caused the network DLINK switched to act funny.

We are running win sbs 2k3, on the server i can browse the internet but on all the network computers i can not.

on all the other computer thei get the following ip config:

Autoconfiguration IPv4 Address. . : 169.254.77.165
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 0.0.0.0

Certain comps and the server are on the same switch but only the server works.

Now one of the switches i have a dlink wireless router attached to it and the wireless works fine all the comps can connect wirelessly.

The Network switches are:

2 x DES - 1218R
DES - 1226G

Server and wireless router works fine off these switches but not the network computers

Please help me i don't know much about switches or how to trouble shoot this problem any help would be greatly appreciated.

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Commented:
Dear, you can do follwoings

option 1:

configure DHCP server in one of your SBS-2003 server and enable. in your DHCP scope make sure to configure proper IP scheme, gateway and DNS.

Option 2:
use static ip address for your clinets, make sure you can ping server. once done you should be able to browse.

may i ask what ip range you are using, private range ?

lets say if you server ip is
IP 192.168.1.1, 255.255.255.0
Subnet 255.255.255.0
GW 192.168.1.254

DNS x.x.x.x

your host should be
IP 192.168.1.x, 255.255.255.0
Subnet 255.255.255.0
GW 192.168.1.254

DNS : primary DNs Server
         Secondry DNS server

Author

Commented:
Hi and thanks for the response

DHCP is already enabled and configured, its only after the power outage the computers have been playing funny buggers.

Commented:
try configuring static ip on 2-3 computers, if its works ok if not than restart your switches.

Author

Commented:
just to let you know i checked the win sbs 2k3 services, and dhcp was service not running so i enabled it restarted the server and the comps.

Now all the computers pick up their correct ips, subnet and and dhcp, but they still cant connect to the net. Nor can i access other server shared folders etc.....

I cant ping computer dns names or computer IPs from server to computer either. But from the computers i can ping server IP address.

Any ideas on this would be awesome!!

Commented:
check DNS service?

for feature go to servicses.msc, make sure AD, DNS, GHCP services set to auto.

Author

Commented:
Yup I have checked all the services and they are all "started" and set to auto.

Still no internet access or share access etc..  :(

Author

Commented:
Also before the power outage everything was working fine shares and internet access.

Commented:
go to cmd, type nslookup dcname, and check the outputs. its hould be similer to this

Server:  yourdc-01.yourdomainname
Address:  DCIP

Name:    yourdc-01.yourdomainname
Address:  DCIP

if not, then check DNS settings in your host, your DNS server should be primary in DNS TAB.

Author

Commented:
Hi when i do NSLOOKUP it says cant find server, address unknown

Commented:
means the problem is from DNS. please do follwoing and revert back with results

1) go to you AD/DNS server
2) go to cmd and type nslookup
3)type your somain name and press enter.( edit your domainname and ip and uplod results)
4) type your server name and press enter, (edit your servername and ip and uplod results)
5) if you sucees in nslookup on server then start step 7
6) if you are not scuceed then check PTP record of DNS server or if possible restart AD/DNS server
7) go to clinets, go to cmd. type ipconfig/all
8)ping server ip, if scueed
9)ping server hostname
10)if not scuessful add your dns server ip name in your host dns setting.
Commented:
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Commented:
In your dhcp settings what do the users get as their DNS server (do an ipconfig /all).  Compare this to the Server as this is working ok.  

Author

Commented:
Hi below are nslookup results

C:\Users\homer>nslookup servername
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  192.168.0.2

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Users\homer>nslookup dcname
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  192.168.0.2

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

Author

Commented:
Also I did the DNS monitor Test and the "Recursive Query"  failed

Hi Anglo thanks for your response, ipconfig /all looks good

Commented:
what is 192.168.0.2?  What ip and gateway are your pcs being assigned?

Author

Commented:
Hey guys thanks for the help, i cleared the DNS cache and reloaded the DNS names, then rebooted the server. All good!
Thanks heaps

Author

Commented:
Cheers
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