Node Question: ¿One Way TCP Connections?

[setshocker]

Hi all!

In zabbix documentation said that zabbix node have "One way TCP connections". How can I get it? I always thought that TCP is a 2-ways comunication...

I ask it because I need a "Child Node" which send information to a "Master Node" in only one direction (cause security), Node -> Master. but in my tcpdump I see traffic in both ways.

It is possible?

[Colttt]

TCP works with an ACK (packet recive) but the node open the port to the master that is mean with one direction..