Ping a specific port
lazarus / 38-Networking and Web Programming

----------------------------------------------------------------------
sk.loda98 · 2017-04-27 13:16

Hi guy.
Today i have a small problem with PingSend in synapse
http://synapse.ararat.cz/doc/help/pingsend.TPINGSend.html

pingsend can ping a host. But when i try Ping a host like
192.168.100.2:8000 and it doesn't work.

Can anyone help me?
p/s:sorry for my really really bad english

----------------------------------------------------------------------
Remy Lebeau · 2017-04-28 18:53

Quote from: sk.loda98 on April 27, 2017, 03:16:20 pmpingsend can ping
a host. But when i try Ping a host like 192.168.100.2:8000 and it
doesn't work.

Of course not, because '192.168.100.2:8000' is not a valid hostname,
you must remove the ':8000' portion.  This is because you can't ping a
specific port to begin with, only a host.  Pings use the ICMP
protocol, which operates at layer 3 of the OSI Network model, whereas
ports are used by the UDP and TCP/IP protocols, which operate at layer
4 instead.  Ports don't exist at layer 3.

If you want to check if a server is running on port 8000, the only
option is to actually try to connect to it.