UDP Speed Test

Unique Test Cases

UDP Test Suite
Features Support How it works Pricing Download. Also, not something you would expect to see listening on Internet facing systems. In this case, the VPN will take care of error correction. I want to do more recon. TCP is therefore preferred for data integrity. You should never use this for serving actual websites.

TCP and UDP Basics

UDP Port Scan

The CSV file contains two incorrect request messages and, as you can see on the screenshot above, the server did not recognize the two messages and two Response Assertions finished unsuccessfully. As you can see, the script works correctly and if you want to scale up the script, you can change the number of threads and ramp-up period in the Thread Group element.

You now know how to load test a UDP server. You can also manipulate data conversion with the help of embedded classes, or you can just implement the basic interface and write your own converter. To learn JMeter, check out our free JMeter academy. Click here to subscribe to our newsletter. View the discussion thread. Aleksey Merzlyakov and Sergey Horban. Luis Martinez and Oscar Calderin.

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If you proceed, your test will be aborted. He has 3 years of experience in IT and 2 years of experience in software testing. His primary activities in software testing are performance testing and security testing. The address field can contain a URL. If the checkbox is set, the UDP Sampler will be waiting for a response from the recipient.

The waiting time milliseconds is taken from the Response Timeout field. Otherwise, the socket will be closed at the end of the thread iteration. Request Data - the field for the information to be sent. The UDP Sampler contains three class implementations: UDPSampler - This implementation does not convert data and is used as default. It is used when the field is empty or does not contain valid class name. The answer of the server converts from simple text to hex-string too.

This implementation is the most useful, because a number of clients work with binary data. Request data must consist of 3 parts: In addition, all messages are displayed in the console, in which our UDP server was launched. The CSV file for our server looks like this: Add a Constant Timer as a child element to the Thread Group to regulate request rates.

The final structure and the result of the script execution are shown in the screenshot below. Please enter a valid URL. You might also find these useful: Since UDP is a connectionless protocol, finding open ports is more difficult than testing TCP ports where you are able to get a three way TCP handshake to confirm the port is open.

In a UDP port scan there can be some ambiguity in the results. A non-responding port could be a port that is firewalled or it could be a service that has not recognized the initial packet so did not respond.

The other option is that a closed port responds with an ICMP Port Unreachable message, this indicates that there is no service running on that port, however even these can be a little unreliable as a firewall may rate limit or block the ICMP port unreachable messages.

UDP port scans should not be ignored by testers as they can leave an organization vulnerable to a number of different attacks, these include exploitable services that can lead to remote execution, or commonly UDP reflection attacks against services such as NTP and DNS. Understanding what services are open through the firewall is an important part of a security vulnerability assessment. An attacker can spoof the IP packet to include any source IP address. The amplification factor depends on the protocol.

DNS and NTP have been common amplification attack protocols in the past but more recently a much more devastating amplification attack was discovered using Memcached udp port Using memcahced attackers were able to get an amplification factor of to times the payload.

More details of the amplification vectors and ports can be found on the US Cert Advisory. In order to understand the responses from a UDP port scan I have scanned my my local router with telnet. The scans and responses have been captured with Wireshark in order to display the UDP traffic. The captures were taken on the local host that was running the Nmap scans. You can see the open filtered result in Nmap. This is due to the firewall on the router dropping the UDP packet. No response can be seen in the capture.

Multicast DNS is running on the router, as you can see in the Nmap result showing an open port. In the capture you can the response from the router answering, this comes back to the localhost on a source port of

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