Oh Joy

[Joanne]

 

Oh my...

[FN-GM]

You must have more than 218 addresses in the range. Unless you have some statics? Maybe you can extend the lease range?

 

A quick an dirty fix is to reduce the lease time to an hour or 2. It will free up addresses that have been inactive for a while.

 

Long term create a new VLAN and dump some machine into it.

Edited October 17, 2014 by FN-GM

[Gatt]

What is your lease time BTW? I tend to use 1 day for them

[Joanne]

Yeah I have deleted a few iphones off there. Lease is currently at 1 day. I'll put it down to a few hours.

 

I guess EVERYTHING has been switched on today!!

[Gatt]

Keep an eye on your DNS too - leases that short will probably result in Duplicate DNS entries if left too long

[Joanne]

I can't extend my range... county innit!!

 

Just sent them a nice e-mail asking if I can get more IP addresses. Yeah the 30-odd others are for servers, printers and switches.

[sted]

I can't extend my range... county innit!!

 

Just sent them a nice e-mail asking if I can get more IP addresses. Yeah the 30-odd others are for servers, printers and switches.

 

can you move the switches to say 192.168.0.1 (or other ip address you dont use) just means you need to change your ip to alter their settings?

[Joanne]

no point for the 4 addresses it would free up. I've e-mailed county. It's only going to get worse in future, so asked if I can get more addresses. Dat 255.255.254.0 subnet innit.

[teejay]

Firewall and proxy NAT between you and county, pick your own private range, job sorted ;-)

[FN-GM]

no point for the 4 addresses it would free up. I've e-mailed county. It's only going to get worse in future, so asked if I can get more addresses. Dat 255.255.254.0 subnet innit.

 

would advise against doing that. to many devices and you will have performance issues because of broadcast. If I was you I would create a new separate VLAN

[simpsonj]

Could start to deny devices IP addresses by Mac address? Very easy to do with Server 2012 (right click the entry - Add to Filter - Deny), slightly harder with 2008 or 2008R2, but essentially create a file called MACList.txt in %WinDir%\System32\dhcp and use the following as a template:

 

#MACList.txt

MAC_ACTION = {DENY}

#List of MAC Addresses:

041e64e4abb8 #Adams Ipod

00233213c4b2 #CharlieeLouu-Xx

e806885228e3 #hardinss Phone

 

First part is the Mac Address, the part after the hash is ignored, but allows you to identify what device you've blocked (in case you accidentally block something important!).

 

Once created and filled in with relevant data, restart the dhcp service and it should block those mac addresses from receiving ip addresses. Had to do this before we were moved off of the county network.

[Eric]

A quick an dirty fix is to reduce the lease time to an hour or 2. It will free up addresses that have been inactive for a while.

Are you sure? When do the clients check their lease, if they "believe" that it is very long?

[FN-GM]

Are you sure? When do the clients check their lease, if they "believe" that it is very long?

 

What?

 

Reducing the time will free up address for devices not connected to the network.

[hardtailstar]

I bet most would be teachers connecting personal equipment to it.

 

We actively boot them off.

[win]

As a gym goer you could start running around and turning computers off

[Joanne]

As a gym goer you could start running around and turning computers off

 

Hahahah, while fully capable of this... I am still lazy as. Plus the address would still be leased out on the server!