Delete DHCP users every hour - batch file?

[Ben_Stanton]

Hi guys,

 

I have a server setup literally just for DHCP on a small scope (server 2003). I'd like to delete the users from the list every hour or so. What is the best method? I've looked a NETSH commands but can't see anything obvious.

 

But I am stupid.

 

Cheers in advance

 

Ben

[jamesreedersmith]

The first question is why but an easy way to only have address issued for 1 hour is to set the dhcp lease time to 1 hour

[Ben_Stanton]

Long convoluted reason. But, there are 25 ip's available. These get filled up pretty quick as there are more than 25 users that might need to join. I have set the lease time to 1 hour, but that doesn't seem as effective as manually deleting them from the list.

[jamesreedersmith]

Can you not create a bigger scope - change the range if needed?

[jamesb]

Deleting them from the list manually could potentially give you a real headache when you get DHCP conflicts. You'll be better off relying on the lease or expanding the scope - of course with a lease of 1 hour, are none of these users going to need an IP address for longer than that?

[SYNACK]

Doing this is going to make that segment a nightmare, you'll end up with the same IPs on differnt machines and weird traffic issues. You really need to fix this properly if you want less hassels not more.

[andydis]

i agree with synack, however if you really really wanted to you would use grab a copy of the dhcp MDB file "clean" ( with no users on it) and then the batch file would simply stop the service and copy/ overwrite to mdb and start the service . You can use the task scheduler to automate

[Ben_Stanton]

OK great, thanks guys. I'm aware of all the issues, believe me. You know how it is when you inherit somebody else's mess... and then are too scared to touch it in fear of it going bang big time!

 

Ta

 

Ben

[sted]

isnt there a +/- x mins on dhcp so setting to 1 hour might mean 90 mins what about setting lease times to say 10 mins?

[jamesfed]

OK great, thanks guys. I'm aware of all the issues, believe me. You know how it is when you inherit somebody else's mess... and then are too scared to touch it in fear of it going bang big time!

 

Ta

 

Ben

 

By the sounds of it if you don't fix this problem there is the potential for something to go bang anyway.

 

Obviously we aren’t in your shoes and don't know the true nature of what is going on but I would seriously take the advice of increasing the range and making this problem go away without having to muck around with short releases.