ICMP differs from transport protocols such as TCP and UDP in that it is not typically used to exchange data between systems, nor is it regularly employed by end-user network applications (with the exception of some diagnostic tools like ping and traceroute). ICMP for IPv4 is defined in RFC 792.

SRX300,SRX320,SRX340,SRX1500,vSRX. In this example, you configure both the host (device A) and the remote device (device B) to act as TCP and UDP servers. You configure a probe for customerC, which uses TCP packets. Engine Options | PingPlotter UDP Packets (Unix-Style). This uses ports 33434 – 33500 and closely mirrors Unix’s traceroute command. This uses ports 33434 – 33500 and closely mirrors Unix’s traceroute command. This method will sometimes allow you to trace to a destination that isn’t reachable via ICMP, or might allow you to reach the internet even if your ISP is RPM Overview - TechLibrary - Juniper Networks

Prevent Network Hacking with Port Scanners - dummies

Jul 21, 2016 · Hi. We test the connection with tcp port using the command: telnet IpAdress tcpPort. for instance: telnet 10.10.1.20 8080. but, how can I do to test the connection with an udp port.

Sep 01, 2015 · UDP destination port – range of 49152 – 65535 (UDP ports in this range are usually not allocated) The goal of UDP ping is to detect if there is an active host on the target interface (IP address). To do so, UDP ping sends an IP packet carrying a UDP packet. Once the packet is sent, UDP ping listens to all incoming ICMP messages.

In version 4 and 4.1 - I could have used UDP and TCP without an issue. Seems like the Firewall on version 5 would only accept ICMP and would block TCP/UDP - "ping timed out". Unfortunately, as I can use it, I'd rather use UDP(Even 'refused' would do it). How Fast is UDP Internet Speed? We believe that it's a conflict of interest when Internet service providers operate their own speed tests. A third party opinion is necessary and the provider shouldn't be allowed anywhere near the process. Ping is a tool aimed for testing (echo) replies from network hosts using the ICMP protocol. LDAP is a protocol that by default lives on TCP port 389, and does not directly communicate with ICMP. If you're just looking for a tool to give you a quick "yeah, port is open and available", then you can just do a telnet query for port 389 (LDAP) or