DHCP problems

I have a server running Win2000 server, sp4. It has a static IP address, and DHCP turned off.

However, on reboot, it is asking for, and getting, up to 10 leases from the dhcp server. This is causing problems with being able to see this box on the network using dns. We swapped out the NIC, but it did not help.

Any ideas what might be going on here?

Thanks.

VMWare server installed perhaps?

One tip.. Never use DDNS with a server. It's got a static IP so add it statically to DNS too.
DDNS is quite nice but only use it for workstations (in combination with dhcp).

Thanks....no VMWare, and DDNS is off for this server.

I see that others had similar problem and solved it with turning off RAS. Comments?

So if DHCP is turned off...where do the workstations get thier IPs from???

a router??

Personally I always let the server supply the IPs...and turn dhcp off on the router.

MLF

Depending on the size of the network, I would turn off DHCP and provide fixed IP addresses even to the work stations. You can make your net a little more secure this way.

Quote:

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Originally Posted by fourdc

Depending on the size of the network, I would turn off DHCP and provide fixed IP addresses even to the work stations. You can make your net a little more secure this way.

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and may I ask...How would that make it more secure???

Security by obscurity????

MLF

Sorry bout the double post I forgot to add ....depending on where the IPs are coming from....I would check dns settings....I have seen many a LAN go out to the isp for local addressing....

What happens when you ping the server by name?

MLF

If you can physically sit at the workstations can you not manually configure the IP address then configure the server to only accept the IP adresses you provide?

Thats what I did with my 7 station home network which spans Ubuntu and XP operating systems. I don't want that brat next door "squatting" on my wireless.

I use encryption, passwords and ACLs for security.

What happens if the brat figures out your IP range and uses one of your machines IP addys....tossing your machine of the network??

In a windows server environment....it likes to do the DHCP...specifially with older clients and apps thet use WINS\NetBios.

MLF

This is normal for Routing and Remote Access. I would make sure that RRAS is not configured for VPN access as this service will grab a number of IPs to make sure VPN clients have some available.

To get to the core of your problem, as stated before, turning off DDNS on the NIC and adding the DNS record manually on the DNS server should work, as long as it's not a domain controller. You can change the DDNS setting in the advance TCP/IP properties of the NIC.

Hope this helps.

MLF... hadn't thought of that.

My firewall isn't set up by range, to use DHCP I would have to set it by range. Currently I specify individual IP addresses

However, I experienced a network crash because someone duplicated an IP address once. Neither of the workstations could communicate and other computers couldn't communicate with them.

So in order for the kiddie to squat he'd have to pick a station that was offline and then get by the other security.

The wired network I run at work has assigned IPs and we unplug patch panel to wall jack connections for inactive jacks. Once physical security is compromised then all sorts of bad things can happen.