A network device in the packet path is blocking traffic common culprits are firewalls, routers with access control lists and even your Linux box running iptables.The server not listening on the port because the software isn’t installed or started.Faulty cables, interfaces of devices in the packet flow.Lack of communication could be due to the following:
One of the most common uses of tcpdump is to determine whether you are getting basic two-way communication. It saves the file in a pcap format, that can be viewed by tcpdump command or an open source GUI based tool called Wireshark (Network Protocol Analyzer) that reads tcpdump pcap format files. tcpdump also gives us an option to save captured packets in a file for future analysis. It is available under most of the Linux/Unix based operating systems. Tcpdump is a most powerful and widely used command-line packets sniffer or package analyzer tool which is used to capture or filter TCP/IP packets that received or transferred over a network on a specific interface.
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