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Messy DHCP

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3 replies

by jabulani

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I am not sure what is the best approach to take with this problem.
The DHCP does not appear to be properly set up, leading to numerous IP address conflicts on a daily basis.
Availability is 13%
Lease period is set to Infinite.
Printers are on DHCP
Some servers are on DHCP
Dozens of reservations and none excluded.
I reset the lease period to 2 days hoping it would flush out over the weekend but no such luck since most users leave their machines on all the time. I try to release and renew leases to pick up the new 2 day period but I get error: "Access denied" ??
Can I reconfigure the scope without any visibility to the users and servers or is it better to define a new scope and Can I have two scopes defined with the same addresses if one is inactive?
There is going to be 3 day power down in the building over Easter, will that help to flush the DHCP database?

3 replies

by some guy in seattle

Some suggestions:

- set up all common devices (servers, printers, etc.) with static IPs. This helps maintain continuity if you are not running WINS.
- Keep your lease period low, even in the hourly range until the problem stabilizes. Then set it to about 7-14 days or so depending on the dynamics of your network.
- Reservations are not needed if all common devices have static IPs. User PCs should be all right without reservations.
- all scopes should be different to eliminate possible IP conflicts.
- Define a new scope to start afresh.
- There may be an issue with the present infinite scope as these devices will not release IPs back into the range for use by others. Maybe try an IP ping sweep to identify these machines and then reboot them to get them to accept the new scope (with the finite lease!). This is probably the most tedious part, but needs to be done.

Hope that helps,

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