Installation of logstash-input-kafka without internet connection

Hi,
I want to install logstash-input-kafka without internet connection on the server.
After a lot of search, I have downloaded a gem file: logstash-input-kafka-4.2.0.gem

Now, I am running the command

# /opt/logstash-5.5.0/bin/logstash-plugin install  logstash-input-kafka-4.2.0.gem
Validating logstash-input-kafka-4.2.0.gem
Installing logstash-input-kafka
Jul 11, 2017 12:35:28 PM org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.NoRouteToHostException) caught when processing request to {s}->https://repo.maven.apache.org:443: No route to host
Jul 11, 2017 12:35:28 PM org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RetryExec execute
INFO: Retrying request to {s}->https://repo.maven.apache.org:443
Jul 11, 2017 12:35:31 PM org.apache.maven.wagon.providers.http.httpclient.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.NoRouteToHostException) caught when processing request to {s}->https://repo.maven.apache.org:443: No route to host

Of course, without Internet connection, I cannot ping repo.maven.apache.org
How can I finish my installation ?
thanks for your tips

https://www.elastic.co/guide/en/logstash/current/offline-plugins.html

very easy if you work for a bank without internet connection :wink:
So, I prepare the zip file on my personal computer and download on the server,

unzip /tmp/logstash-input420.zip

ls -lR /tmp/logstash

/tmp/logstash:
total 3528
drwxr-xr-x 2 root root 101 Jul 13 06:41 dependencies
-rw-r--r-- 1 root root 3612672 Jul 13 06:41 logstash-input-kafka-4.2.0.gem

/tmp/logstash/dependencies:
total 44
-rw-r--r-- 1 root root 12800 Jul 13 06:41 logstash-codec-json-3.0.3.gem
-rw-r--r-- 1 root root 10752 Jul 13 06:41 logstash-codec-plain-3.0.3.gem
-rw-r--r-- 1 root root 15872 Jul 13 06:41 stud-0.0.22.gem

bin/logstash-plugin install --local --no-verify /tmp/logstash/logstash-input-kafka-4.2.0.gem

Installing logstash-input-kafka
Error Errno::EHOSTUNREACH, retrying 1/10
No route to host - SocketChannel.connect
Error Errno::EHOSTUNREACH, retrying 2/10

always, need an internet connection

Did you also try following the instructions for how to install offline plugin packs?