How to listen for multiple tcp connection using nc

linux tcp netcat
Aman Jain picture Aman Jain · Apr 19, 2015 · Viewed 32.4k times · Source

How to create a TCP connection using nc which listens to multiple hosts?

nc -l -p 12345

Answer

Hans Z. picture Hans Z. · Apr 21, 2015

Simultaneous connections are not possible with netcat. You should use something like ucspi-tcp's tcpserver tool or leverage xinetd since you're on Linux.

See: https://superuser.com/questions/232747/netcat-as-a-multithread-server

Consecutive connections could be handled through a shell script that restarts netcat after it finishes.

Related questions

Executing script on receiving incoming connection with xinetd

I want xinetd to execute a shell script when a connection is received on a certain port. To accomplish this, followed this tutorial: [enter link description here][1] Unfortunately, the whole thing doesn't work as I hoped that's why I am …

Read More
How can I send a byte (or bytes) to test a socket listening in my application?

How can I send a byte (or bytes) to test a TCP socket that's listening on a port in my application? My application receives a single byte that tells it what to do. Some operations will receive additional bytes to …

Read More
Freeing up a TCP/IP port?

netstat -tulnap shows me what ports are in use. How to free up a port in Linux?

Read More