Understand and analyze the output for some network commands

Applications IP Networking
1

Good evening, I need your help please, Im Just trying to learn from the scratch the connections flow for some java applications, for instance:

The below output what is the meaning for the 3 semicolons plus * in the destination column?

tcp6       0      0 :::44380                :::*                    LISTEN      32482/java  
tcp6       0      0 :::44006                :::*                    LISTEN      8265/java  
tcp6       0      0 :::44080                :::*                    LISTEN      10138/java

The second example: coffeeapp2 is a load balancer,so it means the java process 8304 is sending out data to the load balancer via http?

a websocket process is tied to a load balancer?

paymweb01.nh.inet:/usr/share/tomEE-plus-9.0.60/apache-tomcat-9.0.60/webapps> lsof -i tcp:80                                                                                                                                                                              
COMMAND  PID       USER   FD   TYPE     DEVICE SIZE/OFF NODE NAME
java    8304 perm_admin  106u  IPv6 1163514443      0t0  TCP proermpaymweb01.nh.inet:45599->coffeeapp2.nh.inet:http (ESTABLISHED)
java    8304 perm_admin  116u  IPv6 1163514444      0t0  TCP proermpaymweb01.nh.inet:45600->coffeeapp2.nh.inet:http (ESTABLISHED)
proermpaymweb01.nh.inet:/usr/share/tomEE-plus-9.0.60/apache-tomcat-9.0.60/webapps>

and the last one, in an apllication i found this output:
Th IP adress and the port is a socket from OSB (oracle service bus) exposing kind a webservice

its a way to test its funcionality in linux using a command line?

REPLY_TO_ADDRESS=http://10.205.100.25:7110/globalIntegration/services/Service-ResourceRelationshipUpdateNotifications/HandleResponseMngNetworkElmt_v1)?wsdl

Thanks you very much for your help in advanced

2

The commands netstat and ss show various connection types.

LISTEN is not an established point-to-point connection but a listening port that is opened when the listening ("daemon") process starts.
:::* is an IPv6 bind-to-all-interfaces mask; a point-to-point connection may occur over all interfaces.

Web connections (http and https) can be done with commands wget or curl

man wget
man curl
3

Thanks you very much MadeinGermany for the explanation, Ive just dont get it when You refer bind-to-all-interfaces mask, it means network interfaces tied to that port?

4

Yes.