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Good day

On a network with limited monitoring tools and limited management, how would I use Zenmap or Wireshark to locate nodes on the network.

Using 192.168.16.0/24 on Zenmap, only scans one subnet, I need to see any node. Say if it has a different IP or if it is using APIPA.

Is it possible? Any remark would be appreciated.

  • I'm not sure how limited your management is, but you can see what machines are connected to a network by viewing switch side ARP tables. This will give you a MAC address > IP address relationship, regardless of subnet. – Spooler Sep 30 '16 at 7:18
  • @SmallLoanOf1M : a L2 switch does not have an arp table. It does have a mac address table where you will find all the MAC addresses of the devices (that are transmitting) on your network but not the ip addresses. If it is a L3 switch then it will have an arp table but it will still not contain all ip addresses on the network, only the ones the switch has recently sent traffic to. – hertitu Oct 1 '16 at 21:14
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If you can install arp-scan, you could do

arp-scan 10.0.0.0/8
arp-scan 172.16.0.0/12
arp-scan 192.168.0.0/16

Similarily, this works in nmap as well:

nmap -sn 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16

Then the hosts would need to react to ping, though.

Of course if you want to scan for EVERY IP it would take way longer.

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  1. You need to use "192.168.0.0/16" in Zenmap to scan other subnets.

  2. If you prefer windows software, you also can use WFilter's "network scan extension" to scan clients in network.

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