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DHCP Clients frequently loose access to the internet but not the server

Posted on 2003-11-25
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Last Modified: 2011-09-20
Windows 2000 server running DHCP, DNS, WINS
 6 XP Pro DHCP clients
Internal IP subnet is 192.168.0.x
Internet access is through a Netgear Pro safe DSL Firewall/Router

Problem:
Clients frequently loose access to the internet but not the server.
The only solution has been to reboot or ipconfig /renew
Firewall has been ugraded to the most recent Firmware.
clients have windows updates installed automaticly
An alternate Router has been tried, but no success.

Server IPcofig

Windows 2000 IP Configuration
      Host Name . . . . . . . . . . . . : western
      Primary DNS Suffix  . . . . . . . : whomes.wa
      Node Type . . . . . . . . . . . . : Hybrid
      IP Routing Enabled. . . . . . . . : No
      WINS Proxy Enabled. . . . . . . . : No
      DNS Suffix Search List. . . . . . : whomes.wa

Ethernet adapter Intel Fast Ethernet LAN Controller - onboard:
      Connection-specific DNS Suffix  . :
      Description . . . . . . . . . . . : Intel(R) 8255x Based Network Connection
      Physical Address. . . . . . . . . : 00-C0-9F-0B-96-1E
      DHCP Enabled. . . . . . . . . . . : No
      IP Address. . . . . . . . . . . . : 192.168.0.2
      Subnet Mask . . . . . . . . . . . : 255.255.255.0
      Default Gateway . . . . . . . . . : 192.168.0.1
      DNS Servers . . . . . . . . . . . : 216.162.192.12
                                          216.162.192.4

Client IPconfig

Windows IP Configuration
        Host Name . . . . . . . . . . . . : wh3
        Primary Dns Suffix  . . . . . . . : whomes.wa
        Node Type . . . . . . . . . . . . : Hybrid
        IP Routing Enabled. . . . . . . . : No
        WINS Proxy Enabled. . . . . . . . : No
        DNS Suffix Search List. . . . . . : whomes.wa

Ethernet adapter Local Area Connection:
        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : Linksys NC100 Fast Ethernet
Adapter
        Physical Address. . . . . . . . . : 00-04-5A-40-EA-AA
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 192.168.0.103
        Subnet Mask . . . . . . . . . . . : 255.255.255.0
        Default Gateway . . . . . . . . . : 192.168.0.1
        DHCP Server . . . . . . . . . . . : 192.168.0.2
        DNS Servers . . . . . . . . . . . : 216.162.192.12
                                            192.168.0.2
                                            216.162.192.4
        Primary WINS Server . . . . . . . : 192.168.0.2
        Lease Obtained. . . . . . . . . . : Monday, November 24, 2003
1:41:19 PM
        Lease Expires . . . . . . . . . . : Tuesday, December 02, 2003
1:41:19 PM

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Question by:rumblefingers
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7 Comments
 
LVL 18

Expert Comment

by:chicagoan
ID: 9818483
>DHCP Clients frequently loose access to the internet
Does this imply that clients with hard coded IP's don't lose connectivity?
When connectivity is lost, can the client ping the gateway?
Where  does a tracerout to a previously working connection die when connectivity is lost?
Can the client resolve FQDN's when connectivity is lost?
Have you looked at your router logs to see if it's running out of resources?

0
 

Author Comment

by:rumblefingers
ID: 9821057
Thank you Chicagoan.
It looks like a DNS issue?  I can ping IP's but not Host names until I IPconfig /renew.  Then I am good for a minuite or maybe hours.
Why would DNS resolution stop?
0
 
LVL 18

Expert Comment

by:chicagoan
ID: 9821522
That's a start.

What kind of machines are these?
Default Gateway . . . . . . . . . : 192.168.0.1        <
        DHCP Server . . . . . . . . . . . : 192.168.0.2  <


Why both the DNS proxy and drizzle in the dns servers?

        DNS Servers . . . . . . . . . . . : 216.162.192.12
                                            192.168.0.2
                                            216.162.192.4
0
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Author Comment

by:rumblefingers
ID: 9825379
192.168.0.1        Netgear Firewall
192.168.0.2        Win2000 Server

Do I not need the local DNS server in the DNS Server list?
0
 
LVL 18

Accepted Solution

by:
chicagoan earned 125 total points
ID: 9825404
Those are public DNS servers...

192.168.0.1        Netgear Firewall - should proxy all dns requests

192.168.0.2        Win2000 Server - Active directory ? DNS server?

If this is an AD scenario, your Domain controller should be set to forward requests to the firewall and the clients set to use the Domain Controller for DNS,
otherwise everyone should use the firewall address.
0
 

Author Comment

by:rumblefingers
ID: 9826027
I removed the local DNS server form the DNS server list over 3 hours ago.
No problems since.
Thank you Chicagoan
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LVL 18

Expert Comment

by:chicagoan
ID: 9826056
:-)
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