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(See the discussion of Smurf Attacks in Chapter 3, "Connectivity Testing".) You will need to repeat ping scans very frequently if you want to get a picture over time. Host (172.16.2.255) seems to be a subnet broadcast address (returned 3 extra pings). Nmap run completed -- 256 IP addresses (6 hosts up) scanned in 1 second You should be warned that this particular scan uses both an ordinary ICMP packet and a TCP ACK packet to port 80 (HTTP).It is a simple matter to create a script that automates the process of pinging a range of IP addresses, particularly if you use a tool like scanner. This second packet will get past routers that block ICMP packets.Once such a problem has been detected, you will need to track it down.While these and similar developments have gone a long way toward lessening the problems of IP management and duplicate IP addresses, IP management remains a headache on many networks.You will need to track address usage to manage services such as DNS.You may need this information to verify licensing information.Several developments over the last few years have helped to lessen the problems of IP management.First, DHCP servers, systems that automatically allocate and track IP addresses, help when dynamic allocation is appropriate.
Most hosts are now configured to ignore ICMP requests sent to broadcast addresses.Management of IP addresses is often cited as the most common problem faced in the management of an IP network.