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DHCP assigned IPs gets disconected Windows 2003 R2

Posted on 2006-07-03
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Last Modified: 2010-04-18
Hi,

For the past two years the DHCP on windows 2000 was configured to give IPs from 10.0.0.1 to 10.0.0.254, i was trying to change this and to add at least 10.0.1.x class. But unfortunatly after doing this, all these clients with these new IPs after 5/10 min gets disconected, ping time out, both XP and Apple clients acts the same.
In the begging i beleived it was because of some networking issue, i have replaced all 4 switches with new ones from HP. The situation is the same.
I have tried to configure a new DHCP server on Windows 2003 R2 machine but no change: the clients with 10.0.0.x can work properly without any interuptions, and the clients who receive the 10.0.1.x IP after 5/10 min gets disconected from alll the servers in the network. If i'm trying to ping from any other machine i get ping time out

Thx
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Question by:cmargoi
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7 Comments
 
LVL 10

Expert Comment

by:victornegri
ID: 17031666
Is your subnet mask set to 255.255.254.0 (both in the DHCP scope and also on the machines with static IPs)? Are there any events in the event log on the workstations?
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Author Comment

by:cmargoi
ID: 17031834
Well, the subnet was 255.0.0.0, i was trying to put 255.255.248.0. But this was the first change i've done, to put back 255.0.0.0 because i was also thinking it's caused by subnet problem, altough i've changed the subnet to servers and clients. No luck; if i only change from 10.0.0.1 to 10.0.1.254, having the old subnet 255.0.0.0 the problem persists.
I don't remeber having something in the event viewer of the clients. What i remember is that on the File Server the Apple clients were disconected with

Session from user "xxxxx" was timed out and disconnected by the server. The IP address of the Macintosh workstation is in the data.
Source MACSRV
ID 12061
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LVL 10

Accepted Solution

by:
victornegri earned 900 total points
ID: 17031936
Can the 10.0.1.x computer ping each other when they get disconnected from the 10.0.0.x portion of the subnet? Can you plug a computer( in the 10.0.1.x range) directly into your server (via a crossover cable) to see if the disconnect problem still occurs?
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LVL 1

Author Comment

by:cmargoi
ID: 17032196
Yes. The Apple computers can see eachother. I don't know about PCs and also about connecting the PC directly to one of the servers. I can not put the network offline again, so i'll have to test these options and let you know.
Thx
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LVL 10

Expert Comment

by:victornegri
ID: 17032567
Try pinging from one PC to another and see if you get a response. What OS are the Apple computers running? Do they have appletalk enabled?
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LVL 1

Author Comment

by:cmargoi
ID: 17033242
Yep, they work. OS X is installed (10.4). Appletalk also TCP/IP is available ... this networks works very nice except i change the DHCP scope ....
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LVL 10

Expert Comment

by:victornegri
ID: 17033277
Post your DHCP server settings here including scope and server options you've configured.
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