Why PerMon Sever Agent listens only on tcp6?

0
votes

To start agent on server by executing the following command

$ ./startAgent.sh

INFO 2018-03-27 18:31:04.981 [kg.apc.p] (): Binding UDP to 4444

INFO 2018-03-27 18:31:05.982 [kg.apc.p] (): Binding TCP to 4444

INFO 2018-03-27 18:31:05.986 [kg.apc.p] (): JP@GC Agent v2.2.0 started

To check its connectivity to this agent from other server, using telnet

$ telnet 192.168.1.31 4444

Could not open connection to the host, on port 4444:Connect failed

if using ipv6 instead of ipv4, it can connect to that port.

$ telnet fe80::250:56ff:xxxx:xxxx 4444

Check the addresses and port, it only listens on tcp6, so that's why ipv6 can connect, ipv4 not. 

$netstat -ano|grep 4444

tcp6       0      0 :::4444                 :::*                    LISTEN      off (0.00/0/0)

udp6       0      0 :::4444                 :::*                                off (0.00/0/0)

My question is that why the server agent only listens on tcp6:4444 ? Is there any way to let him listen on ipv4?

1
jmeterjmeter-plugins

1 Answers

0
votes

Amend startAgent.sh file and add -Djava.net.preferIPv4Stack=true line to it so it looks like:

#!/bin/sh

java -Djava.net.preferIPv4Stack=true -jar $(dirname $0)/CMDRunner.jar --tool PerfMonAgent "$@"

In order to play the same trick with JMeter add similar line to user.properties file (lives in "bin" folder of your JMeter installation)

java.net.preferIPv4Stack=true

References: