[CentOS] how to find unknown ip address?

On 5/28/13, Barry Brimer <lists at brimer.org> wrote:
>
>
> hadi motamedi <motamedi24 at gmail.com> wrote:
>
>>Dear All
>>On my network, there is a node with unknown ip address so I do not
>>know about its range and it can be any of the range xx.xx.xx.xx . Is
>>there any tool on my centos server to find this unknown ip address
>>(irrespective of the range of my centos server self ip range) ?
>
> Listen with wireshark looking for things that don't belong.
>
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Thank you for your reply. So you mean it is independent of my centos
server ip address range or it just shows the ip addresses in the range
of my centos self ip address? (as I don't have a priori information
about that remote node unknown ip address)