"no-response" vs "host-unreach"?

[Daniel Griscom <griscom () suitable com>]

(Sorry if this is inappropriate for this list; let me know and I'll go 
away... ;)

I'm diagnosing an embedded product (no display) that's locked up. The 
network seems to be active, but no ports are open and the hardware 
console is unresponsive. I'd like to collect all the info I can about 
it, so I turned to nmap. The product isn't responding to pings, so I usd 
"-Pn".

Running "nmap -Pn <ip-address>" gave me:
> All 1000 scanned ports on 10.3.4.42 are in ignored states.
> Not shown: 990 filtered tcp ports (no-response), 10 filtered tcp ports 
> (host-unreach)
I'd really like to know the difference between "no-response" and 
"host-unreach", and which ports reported which. What's the difference 
between the two states? How can I see which ports are in which states? 
And, any other suggestions on data I can gather with nmap?


Thanks,
Dan

P.S. Here's the complete output of the nmap run:
> griscom@nob:~$ nmap -Pn -vvvv 10.3.4.42
> Starting Nmap 7.94 ( https://nmap.org ) at 2023-10-06 08:50 EDT
> Initiating Parallel DNS resolution of 1 host. at 08:50
> Completed Parallel DNS resolution of 1 host. at 08:50, 0.00s elapsed
> DNS resolution of 1 IPs took 0.00s. Mode: Async [#: 1, OK: 0, NX: 1, 
> DR: 0, SF: 0, TR: 1, CN: 0]
> Initiating Connect Scan at 08:50
> Scanning 10.3.4.42 [1000 ports]
> Completed Connect Scan at 08:50, 5.88s elapsed (1000 total ports)
> Nmap scan report for 10.3.4.42
> Host is up, received user-set (0.071s latency).
> Scanned at 2023-10-06 08:50:24 EDT for 6s
> All 1000 scanned ports on 10.3.4.42 are in ignored states.
> Not shown: 990 filtered tcp ports (no-response), 10 filtered tcp ports 
> (host-unreach)
>
> Read data files from: /snap/nmap/3152/usr/bin/../share/nmap
> Nmap done: 1 IP address (1 host up) scanned in 5.90 seconds
> griscom@nob:~$ 

--
Daniel T. Griscom
152 Cochrane Street, Melrose, MA 02176-1433
(781) 662-9447  griscom () suitable com  http://www.suitable.com/

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