Netcat - how to get connection time?

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I use simple code to test some service:

nc -v -w 2 google.com 80
Connection to google.com 80 port [tcp/http] succeeded!

It works pretty well, but I also need to have a connection time. Is it possible to get it by netcat? I can't find this in the manual :(

Is this what you want?

echo "[$(date)] Connection to $SERVER $PORT port [tcp/http] $(nc -z $SERVER $PORT &> /dev/null && echo succeeded || echo failed)"

Example:

$ echo "[$(date)] Connection to google.com 80 port [tcp/http] $(nc -z google.com 80 &> /dev/null && echo succeeded || echo failed)"
[Mon Apr 10 12:40:31 UTC 2017] Connection to google.com 80 port [tcp/http] succeeded

$ echo "[$(date)] Connection to google.com 80 port [tcp/http] $(nc -z google2.com 80 &> /dev/null && echo succeeded || echo failed)"
[Mon Apr 10 12:40:20 UTC 2017] Connection to google.com 80 port [tcp/http] failed

Connection timed out for netcat after opening port in router, On Windows PC I've opened a netcat listener on port 4444. Make sure your netcat binds and listens on all IP addresses, not only on localhost,� To get started, you need to enable the shell tool over a Netcat command by using Netcat reverse shell: nc -n -v -l -p 5555 -e /bin/bash. Then from any other system on the network, you can test how to run commands on the selected host after successful Netcat connection in bash: nc -nv 127.0.0.1 5555. Netcat Cheat Sheet

If you use ncat (packaged with nmap) instead of netcat, you can get connection timing information like this:

ncat -v -z google.com 80

The output will appear something like this:

Ncat: Version 7.70 ( https://nmap.org/ncat )
Ncat: Connected to 172.217.15.78:80.
Ncat: 0 bytes sent, 0 bytes received in 0.35 seconds.

Basic troubleshooting with telnet and netcat, In the early years of computing, telnet was used to connect to the or you may have to wait a while to get the Connection timed out error. By default, netcat operates by initiating a TCP connection to a remote host. The most basic syntax is: netcat [options] host port This will attempt to initiate a TCP to the defined host on the port number specified. This is basically functions similarly to the old Linux telnet command. Keep in mind that your connection is entirely unencrypted.

time nc -zw30 <host> <port>

// example:
$ time nc -zw30 google.com 443
Connection to google.com port 443 [tcp/https] succeeded!

real    0m0.064s
user    0m0.003s
sys     0m0.006s

Reference: https://serverfault.com/questions/649532/what-is-the-best-way-to-measure-latency-via-a-telnet-to-port-test-preferably

Testing Network Services with netcat, A connection timed out response indicates that your connection is not getting to the service. Often this happens when when your firewall is� Netcat (or nc) is a command-line utility that reads and writes data across network connections, using the TCP or UDP protocols.It is one of the most powerful tools in the network and system administrators arsenal, and it as considered as a Swiss army knife of networking tools.

netcat, nc -- netcat, Have netcat give more verbose output. -w timeout. Connections which cannot be established or are idle timeout after timeout seconds. The -w flag has no effect� Line 28-29: we want this netcat connection to be a one-time connection, so we declare the connection closed and then close the connection. Line 31: This is a standard HTTP request. If you run the code with the command line arguments "google.com" and "80," then you will see a proper HTTP response

Learning to Use netcat to its Full Potential, There are times where you cannot connect to the remote machine or the answer you get is� Now if you connect to port 12345 of this host, everything you dial will be transferred to the remote side, which tells us that netcat can be used as a chat server. Run on one of the computers: # On the computer A to IP 10.10.10.10 $ nc -l -p 12345

How To Use Netcat to Establish and Test TCP and UDP, By default, netcat operates by initiating a TCP connection to a remote host. Along with the -z option, we have also specified the -v option to tell netcat to provide This time, the dash in the tar command means to tar and zip the contents of the� The connection process is straightforward – we simply launch netcat to connect to 192.168.1.123, as seen in Figure 13.5. Notice that there are no prompts indicating success or failure – all we receive upon connection is a blank line. However, if we start typing in commands, we will see that we will get proper replies.