For example, port 20 is FTP file transfers, port 22 is Secure Shell (SSH) terminal connections, port 80 is standard HTTP web traffic, and port 443 is encrypted HTTPS. TCP ports 0 through 1023 are “well-known ports” that provide system services. Some ports are used more frequently, however. When a device connects to another device over a network, it specifies a TCP or UDP port number from 0 to 65535. The scanner learns which ports on a router or firewall are open, and can use this information to find a computer system’s potential weaknesses. Port filter will make your analysis easy to show all packets to the selected port.Ī port scan is a bit like jiggling a bunch of doorknobs to see which doors are locked. In case there is no fixed port then system uses registered or public ports. Let’s see one DHCP packet capture.Īs Wireshark filter and see only DHCP related packets.įor Port filtering in Wireshark you should know the port number. When we run only UDP through Iperf we can see both source and destination ports are used from registered/public ports. Let’s see one HTTPS packet capture.Īs Wireshark filter and see only HTTPS packets. Now we putĪs Wireshark filter and see only packets where port is 53. Here 192.168.1.6 is trying to send DNS query. Now we putĪs Wireshark filter and see only packets where port is 80. Here 192.168.1.6 is trying to access web server where HTTP server is running. Ports 1024 to 49151 are Registered Ports.īefore we use filter in Wireshark we should know wha t port is used for which protocol.
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