Solved

DHCP Reservation (inactive)

Posted on 2010-09-02
6
1,939 Views
Last Modified: 2012-08-13
In our DHCP list we have 'many' instances of inactive reservations. Is there a way to list / export when the reservation was last used? I intend to then go through & check which instances are still being used [static assigned IP Address] and delete any that are not active, anyone know of a quick & easy [not manually pinging each address] way to do this?

Cheers
0
Comment
Question by:WGMIT
  • 2
  • 2
  • 2
6 Comments
 
LVL 9

Expert Comment

by:BDoellefeld
ID: 33590220
I'm someone else probably has a better way but if I made one up... I would:

Use something like AngryIP Scanner to scan the range (more like ping the range) I wanted for alive hosts and cross reference that with the inactives.

The result would be... If the host responds, yet has an inactive reservation for the same IP, then it would lend to it being static and warrant a quick look to be sure.
0
 
LVL 1

Author Comment

by:WGMIT
ID: 33590529
Thanks for the reply, but I am really needing something that can tell me how long the reservation has been inactive for; 2 weeks maybe someone is on holiday, 2 years maybe its not there anymore!!
0
 
LVL 9

Accepted Solution

by:
BDoellefeld earned 50 total points
ID: 33590752
Oh, I see.

It will keep one week of logging history by default, the rest is vapor.

Logs are located here by default WINDOWS\system32\dhcp
0
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

 
LVL 38

Expert Comment

by:ChiefIT
ID: 33594067
Yes, perform an ANGRYIPSCAN. This will ping the entire subnet for you and also list the computer name of active pings.

http://www.angryip.org/w/Download
0
 
LVL 38

Expert Comment

by:ChiefIT
ID: 33594090
Oops, didn't read what the recommendations were. You should also know that an inactive reservation means the IP address hasn't been offered to a client or server that it was designated for. So, you can rid yourself of ALL inactive reservations.....

0
 
LVL 1

Author Closing Comment

by:WGMIT
ID: 33617978
.
0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
IP address incorrect 8 79
What is this Task? 4 111
Expanding Subnet Mask 20 109
bring up a second server with DNS, DHCP, has File Shares and is a Print Server 5 24
A Cisco router can be configured as a DHCP Server. There are advantages and disadvantages in making your Cisco router work as DHCP Server. Almost all the features for windows DHCP can be configured on Cisco-based DHCP server. Some of the features me…
Network ports are the threads that hold network communication together. They are an essential part of networking that can be easily ignore or misunderstood, my goals is to show those who don't have a strong network foundation how network ports opera…
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question