Сегодняшняя статья о том как узнать какие ip адреса в сети свободны, какие заняты и какие отвечают на icmp запросы. Как обычно мы рассмотрим несколько вариантов решения задачи.
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Вариант первый: nmap
nmap -sP 192.168.247.* Starting Nmap 5.00 ( http://nmap.org ) at 2010-03-23 10:40 EET Host 192.168.247.1 is up (0.00052s latency). Host tester (192.168.247.2) is up (0.00038s latency). Nmap done: 256 IP addresses (2 hosts up) scanned in 3.32 seconds
nmap -sP 192.168.247.1-20 Starting Nmap 5.00 ( http://nmap.org ) at 2010-03-23 10:40 EET Host 192.168.247.1 is up (0.00017s latency). Host tester (192.168.247.2) is up (0.00046s latency). Nmap done: 20 IP addresses (2 hosts up) scanned in 1.51 seconds
Если nmap не установлен у вас то в Ubuntu Linux вы можете установить его так
sudo aptitude install nmap
Вариант второй fping
fping -g 192.168.247.0/28 192.168.247.0 error while sending ping: Permission denied 192.168.247.2 is alive 192.168.247.15 error while sending ping: Permission denied 192.168.247.1 is alive ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.4 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.4 ..... 192.168.247.15 is unreachable
Или так
fping -g 192.168.247.1 192.168.247.3 192.168.247.1 is alive 192.168.247.2 is alive ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 ICMP Host Unreachable from 192.168.247.1 for ICMP Echo sent to 192.168.247.3 192.168.247.3 is unreachable
Если fping не установлен, то в Ubuntu Linux его можно установить так
sudo aptitude install fping
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А еще можно башевским скриптом
типа так for i in {1..254}; do ping -c1 192.168.1.$i; done