your make use of arp to see systems ips that are connected to a network.
How to use ARP command
ARP -s inet_addr eth_adr [if_addr]
ARP -d inet_addr [if_addr]
ARP -a [inet_addr] [-N if_addr]
-a Displays current ARP entries by interrogating the current protocol data. If inet_addr is specified,
the IP and Physical addresses for only the specified computer are displayed. If more than one network interface uses ARP, entries for each ARP table are displayed.
-g Same as -a
inet_addr Specifies an Internet address.
-N if Displays the ARP entries for the network interface specified by if_addr.
-d Deletes the host specified by inet_addr.
-s Adds the host and associates the Internet address inet_addr with the Physical address eth_addr. The Physical address is given as 6 hexadecimal bytes seperated by hyphens. The entry is permanent.
eth_addr Specifies a physical address
if_addr If present, this specifies the Internet address of the interface whose address translation table should be modified. If not present, the first applicable interface will be used.
Examples
arp -a
will show you something like this picture above showing you all ip's and MAC address.
Interface 220.0.0.80
Internet Address Physical Address Type
220.0.0.160 00-50-04-62-F7-23 static
The Physical Address or MAC address as shown above in the format aa-bb-cc-dd-ee-ff is the unique manufacturer identification number. This number should always be an unique address.
arp -s 220.0.0.161 00-50-04-62-F7-23
Above, is an example of how to change the above IP address 220.0.0.160 to 220.0.0.161.
If an IP address has already been assigned to the specific network adapter it is not possible to change that assigned IP address to a new address. In addition, networks italicizing DHCP, BOOTP or RARP will automatically assign the card an IP address, therefore, this command would not be utilized.
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