Snort as Firewall Check?

[Dick via Snort-users <snort-users () lists snort org>]

For some time, I have wondered if the firewall log on my router was 
accurately detecting the various types of internet ugliness (Denial of 
Service, Port Scans, etc.)

It occurred to me that I could set up a machine in the router DMZ and 
separately monitor internet traffic using something like Snort.  The new 
Raspberry Pi 4 seems like a possible candidate, what with 4GB memory and 
a true gigabit ethernet port.

Before charging down that track, I want to confirm that this is 
something Snort would be useful for.  Here are some of the things the 
router reports:

[DoS Attack: ACK Scan] from source: 103.38.23.5, port 80, Thursday, 
August 08, 2019 04:54:39
[DoS Attack: ACK Scan] from source: 13.33.227.116, port 443, Sunday, 
August 04, 2019 16:50:54
[DoS Attack: ACK Scan] from source: 13.33.231.78, port 443, Tuesday, 
August 06, 2019 21:16:50
[DoS Attack: SYN/ACK Scan] from source: 104.196.243.253, port 80, 
Tuesday, August 06, 2019 08:48:23
[DoS Attack: SYN/ACK Scan] from source: 108.187.116.197, port 80, 
Monday, August 12, 2019 06:57:30
[DoS Attack: SYN/ACK Scan] from source: 108.187.116.197, port 80, 
Monday, August 12, 2019 14:52:03
[DoS Attack: RST Scan] from source: 104.27.133.183, port 80, Saturday, 
August 03, 2019 00:41:47
[DoS Attack: RST Scan] from source: 107.77.253.8, port 19092, Friday, 
August 02, 2019 22:25:50
[DoS Attack: RST Scan] from source: 113.160.23.146, port 56688, Sunday, 
August 11, 2019 18:56:03
[DoS Attack: TCP/UDP Chargen] from source: 104.152.52.35, port 47986, 
Monday, August 12, 2019 15:30:18
[DoS Attack: TCP/UDP Chargen] from source: 120.52.152.15, port 55340, 
Friday, August 09, 2019 03:03:18
[DoS Attack: TCP/UDP Chargen] from source: 120.52.152.17, port 58914, 
Friday, August 09, 2019 08:15:56
[DoS Attack: TCP/UDP Echo] from source: 104.152.52.35, port 47986, 
Monday, August 12, 2019 15:35:52
[DoS Attack: TCP/UDP Echo] from source: 136.41.0.79, port 49250, Sunday, 
August 11, 2019 15:03:22
[DoS Attack: TCP/UDP Echo] from source: 136.41.0.79, port 49250, Sunday, 
August 11, 2019 15:03:25

Please forgive me if this question is inappropriate.  My internet 
searches have not turned up information that helps me with this decision.



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