Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I'm gonna setup a Wireless router for a customer.
They have subnet 10.253.48.0/24
What can I do to check if the IP 10.253.48.243 is available to set up the router? I'm on out on a local network at my workplace, the customer's network is IPVPN.

I have Access to the Linux console on the out network that can communicate with our customers. I thought that I could use Nmap command to find out if there's any equipment on the network. I tried running the command nmap -sP -PE 10.253.253.0/24 But I dont get the response I'm looking for. What might I do different to find out if this is an available address?

share|improve this question
    
As a side note.. I've noticed that whenever I do scans of an entire subnet, I never get good results unless I set the --scan-delay option. I scanned a network here just now using your nmap string which returned 54 hosts. Adding the scan-delay, It brought back 74 hosts, which is closer to what I was expecting. –  Safado Feb 25 '13 at 15:29
    
Can you just ping the ip address to see if there's a response? If there's no response its free? –  user1527227 Jul 3 at 5:16
add comment

1 Answer

Ask their network administrator. There is no other way that doesn't risk causing serious problems. It may belong to a machine that's off at the moment.

share|improve this answer
14  
Many people have decided that they are too clever for this answer, and even more people have been woken up in the middle of the night as a consequence. Thousands of dollars in labor are lost every year to ignoring this. –  Andrew B Feb 4 '13 at 9:21
1  
+1. If the customers does not have an allocation plan, he deserves what he gets - namely a clueless contractor setting up a bad ip. –  TomTom Feb 25 '13 at 15:58
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.