W dniu 20.07.2020 o 05:47, Timothy Sipples pisze:
Mike Schwab wrote:
Port 23 is standard telnet. Port 3270 is non-standard TN3270E.
IANA has actually reserved port 3270 for "Verismart":HMC Integrated 3270 console
https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt
I have no idea what Verismart is, or was. It's probably moribund, like
many port reservations. You're not obliged to honor IANA's reservations
and recommendations, although it's the "polite thing to do." If nothing
else it makes the job of somebody monitoring, managing, and
troubleshooting network traffic a little easier, because at least you give
that person a clue what the traffic is about.
[...]
Well, I often see shop-defined port, for one reason: security by
obscurity. People who decided claim it is another level of complexity
for hacker. Note: this is NOT my opinion.
The other reason is ...lack of reason. Simply, someone who configured
TN3270 chose some port with no analysis. Just, any free number
available. Sometimes is it 3270 or other familiar number.
--
Radoslaw Skorupka
Lodz, Poland
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