Re: Continuous tcp ping?

[Fyodor <fyodor () nmap org>]

On Sun, Aug 27, 2017 at 7:06 PM, ToddAndMargo <ToddAndMargo () zoho com> wrote:

> Hi All,
>
> Is there a way to use NMap to do a continuous tcp
> ping of a particular port?  I am only after the
> response time

Hi Todd.  You would generally use our nping utility for that.  It comes
with Nmap.  Here's an example of sending 3 TCP syn packets to port 80 of
scanme.nmap.org:

# nping -tcp -c3 -p 80 scanme.nmap.org

Starting Nping 0.7.40 ( https://nmap.org/nping ) at 2017-08-27 22:28 PDT
SENT (0.0456s) TCP 192.168.0.108:49232 > 45.33.32.156:80 S ttl=64 id=9502
iplen=40  seq=1975150814 win=1480
RCVD (0.2278s) TCP 45.33.32.156:80 > 192.168.0.108:49232 SA ttl=52 id=0
iplen=44  seq=3623470103 win=29200 <mss 1460>
SENT (1.0459s) TCP 192.168.0.108:49232 > 45.33.32.156:80 S ttl=64 id=9502
iplen=40  seq=1975150814 win=1480
RCVD (1.2477s) TCP 45.33.32.156:80 > 192.168.0.108:49232 SA ttl=52 id=0
iplen=44  seq=3639139057 win=29200 <mss 1460>
SENT (2.0478s) TCP 192.168.0.108:49232 > 45.33.32.156:80 S ttl=64 id=9502
iplen=40  seq=1975150814 win=1480
RCVD (2.2678s) TCP 45.33.32.156:80 > 192.168.0.108:49232 SA ttl=52 id=0
iplen=44  seq=3654733783 win=29200 <mss 1460>

Max rtt: 219.887ms | Min rtt: 182.099ms | Avg rtt: 201.251ms
Raw packets sent: 3 (120B) | Rcvd: 3 (138B) | Lost: 0 (0.00%)
Nping done: 1 IP address pinged in 2.32 seconds

If you want to send the packets indefinitely, use -c0.  More details:
https://nmap.org/nping/

Cheers,
Fyodor

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