I had a situation today where i was asked "telnet to the port, see if it
connects" to check their firewall configuration. I realize this isn't going to
work because telnet is tcp and the configuration is udp but it caused me to
wonder "Is there a way to test protocol connectivity (are udp packets from a
source making it to a destination) without actually trying to make a
connection?" The reason I ask is that an existing 1024 bit connection is being
replaced by a 4096 bit one and I would prefer to know that the firewall
configuration (over which I have no visibility or control) was "in place"
before attempting to do so.
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