Keep alive connection, install this gist on cron every 1 minute

keepalive.sh

#!/bin/bash
# ping process detector. if no running ping process, execute it once
# to be called by cron (for checking and re-spawn) every 1 minute

# need to specify destination IP for ping first
if [[ -z $DEST_IP ]]; then
        echo "Please set DEST_IP before calling this script"
        exit 1
fi

# detect if there's any running ping process for that IP
ping_proc_count=`ps aux | grep "ping $DEST_IP" | wc -l`

# if running ping process does not exist, re-execute ping
# if there's already running ping process, do nothing (keep it that way)
if [[ "$ping_proc_count" == "1" ]]; then
        echo "Ping is not alive, restarting..."
        ping $DEST_IP &
fi

echo "Ping checker finished"