Find alive IP
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If there is an IP hidden after a firewall, how Linux (or any) command should I use in order to know if this IP is alive ? Because PING is not working in this case ...
You might be able to use nmap to find out. You can use the
-Pnoption to tell nmap to skip the ping scan to determine if the host is up. Be aware that nmap will try to connect to a wide range of known ports, which might trigger watchdogs on the target network. In general, using nmap on networks that you are not a valid user of is considered bad manners, so discuss with the network owner before using. Your success will depend on how the firewall is configured. If it is set up to block all access from WAN for that host (e.g. drop all inbound/outbound packets to/from the host you are interested in), you will never get any response from the host. Your only hope may be that you can access a different host on the target network and be able to try to ping or connect to the host from there.Keep Calm and Carry On
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If there is an IP hidden after a firewall, how Linux (or any) command should I use in order to know if this IP is alive ? Because PING is not working in this case ...
You already got an answer here: [Find alive IP](https://forums.codeguru.com/showthread.php?565412-Find-alive-IP&p=2239325#post2239325) Doesn't it work?
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If there is an IP hidden after a firewall, how Linux (or any) command should I use in order to know if this IP is alive ? Because PING is not working in this case ...
If the target is behind a firewall, and that firewall is configured to quash inbound ICMP, you have no way of pinging the machine.
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Dave Kreskowiak