NMAP Always says host is down (when using -Pn it says ports filtered)












1















I am running Kali 2.0 (Kali sana) and I have a problem with NMAP, it everytime says that host is down when I scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap) on my IP it works... I do not know what can be wrong.










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    1















    I am running Kali 2.0 (Kali sana) and I have a problem with NMAP, it everytime says that host is down when I scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap) on my IP it works... I do not know what can be wrong.










    share|improve this question



























      1












      1








      1








      I am running Kali 2.0 (Kali sana) and I have a problem with NMAP, it everytime says that host is down when I scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap) on my IP it works... I do not know what can be wrong.










      share|improve this question
















      I am running Kali 2.0 (Kali sana) and I have a problem with NMAP, it everytime says that host is down when I scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap) on my IP it works... I do not know what can be wrong.







      networking security port nmap






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      edited Jan 21 '18 at 19:25









      Raghav Dinesh

      1115




      1115










      asked Jan 8 '16 at 21:34









      EntropyEntropy

      615




      615






















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          You are probably seeing this message:



          Note: Host seems down. If it is really up, but blocking our ping probes, try -PN


          Usually, nmap sends a number of probes to determine if the host is actually up or down, one of them is pinging the host. ping uses ICMP packets to reach the host, so if you're seeing that message it's either because the destination host has incoming ICMP packets filtered, either because you have outgoing ICMP packets filtered in your firewall.



          As per the situation that you describe (nmap run from an external source works fine but you locally are unable to nmap any host), the most likely reason is that you have outgoing ICMP packets filtered. Note that router is not the only device capable of blocking traffic. Antivirus, software firewalls also are.






          share|improve this answer


























          • I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

            – Entropy
            Jan 9 '16 at 20:09











          • Then you probably have outgoing ICMP requests filtered.

            – nKn
            Jan 9 '16 at 20:26











          • My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

            – Entropy
            Jan 10 '16 at 13:27













          • It suddenly stopped to work even on Windows...

            – Entropy
            Jan 10 '16 at 18:50











          Your Answer








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          You are probably seeing this message:



          Note: Host seems down. If it is really up, but blocking our ping probes, try -PN


          Usually, nmap sends a number of probes to determine if the host is actually up or down, one of them is pinging the host. ping uses ICMP packets to reach the host, so if you're seeing that message it's either because the destination host has incoming ICMP packets filtered, either because you have outgoing ICMP packets filtered in your firewall.



          As per the situation that you describe (nmap run from an external source works fine but you locally are unable to nmap any host), the most likely reason is that you have outgoing ICMP packets filtered. Note that router is not the only device capable of blocking traffic. Antivirus, software firewalls also are.






          share|improve this answer


























          • I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

            – Entropy
            Jan 9 '16 at 20:09











          • Then you probably have outgoing ICMP requests filtered.

            – nKn
            Jan 9 '16 at 20:26











          • My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

            – Entropy
            Jan 10 '16 at 13:27













          • It suddenly stopped to work even on Windows...

            – Entropy
            Jan 10 '16 at 18:50
















          0














          You are probably seeing this message:



          Note: Host seems down. If it is really up, but blocking our ping probes, try -PN


          Usually, nmap sends a number of probes to determine if the host is actually up or down, one of them is pinging the host. ping uses ICMP packets to reach the host, so if you're seeing that message it's either because the destination host has incoming ICMP packets filtered, either because you have outgoing ICMP packets filtered in your firewall.



          As per the situation that you describe (nmap run from an external source works fine but you locally are unable to nmap any host), the most likely reason is that you have outgoing ICMP packets filtered. Note that router is not the only device capable of blocking traffic. Antivirus, software firewalls also are.






          share|improve this answer


























          • I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

            – Entropy
            Jan 9 '16 at 20:09











          • Then you probably have outgoing ICMP requests filtered.

            – nKn
            Jan 9 '16 at 20:26











          • My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

            – Entropy
            Jan 10 '16 at 13:27













          • It suddenly stopped to work even on Windows...

            – Entropy
            Jan 10 '16 at 18:50














          0












          0








          0







          You are probably seeing this message:



          Note: Host seems down. If it is really up, but blocking our ping probes, try -PN


          Usually, nmap sends a number of probes to determine if the host is actually up or down, one of them is pinging the host. ping uses ICMP packets to reach the host, so if you're seeing that message it's either because the destination host has incoming ICMP packets filtered, either because you have outgoing ICMP packets filtered in your firewall.



          As per the situation that you describe (nmap run from an external source works fine but you locally are unable to nmap any host), the most likely reason is that you have outgoing ICMP packets filtered. Note that router is not the only device capable of blocking traffic. Antivirus, software firewalls also are.






          share|improve this answer















          You are probably seeing this message:



          Note: Host seems down. If it is really up, but blocking our ping probes, try -PN


          Usually, nmap sends a number of probes to determine if the host is actually up or down, one of them is pinging the host. ping uses ICMP packets to reach the host, so if you're seeing that message it's either because the destination host has incoming ICMP packets filtered, either because you have outgoing ICMP packets filtered in your firewall.



          As per the situation that you describe (nmap run from an external source works fine but you locally are unable to nmap any host), the most likely reason is that you have outgoing ICMP packets filtered. Note that router is not the only device capable of blocking traffic. Antivirus, software firewalls also are.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jan 10 '16 at 8:45

























          answered Jan 9 '16 at 17:55









          nKnnKn

          4,48552231




          4,48552231













          • I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

            – Entropy
            Jan 9 '16 at 20:09











          • Then you probably have outgoing ICMP requests filtered.

            – nKn
            Jan 9 '16 at 20:26











          • My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

            – Entropy
            Jan 10 '16 at 13:27













          • It suddenly stopped to work even on Windows...

            – Entropy
            Jan 10 '16 at 18:50



















          • I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

            – Entropy
            Jan 9 '16 at 20:09











          • Then you probably have outgoing ICMP requests filtered.

            – nKn
            Jan 9 '16 at 20:26











          • My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

            – Entropy
            Jan 10 '16 at 13:27













          • It suddenly stopped to work even on Windows...

            – Entropy
            Jan 10 '16 at 18:50

















          I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

          – Entropy
          Jan 9 '16 at 20:09





          I see that but when i try online nmap tool it works.... It does that thing "host seems down" for every host i try...

          – Entropy
          Jan 9 '16 at 20:09













          Then you probably have outgoing ICMP requests filtered.

          – nKn
          Jan 9 '16 at 20:26





          Then you probably have outgoing ICMP requests filtered.

          – nKn
          Jan 9 '16 at 20:26













          My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

          – Entropy
          Jan 10 '16 at 13:27







          My router is not filtering ICMP packets nor there is other way it can be filtered as it works on my WIndows machine (main machine - Kali is Dual Boot)... And I do not have Antivirus or firewall on Kali.

          – Entropy
          Jan 10 '16 at 13:27















          It suddenly stopped to work even on Windows...

          – Entropy
          Jan 10 '16 at 18:50





          It suddenly stopped to work even on Windows...

          – Entropy
          Jan 10 '16 at 18:50


















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