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My tags are selected for most casual users to be able to do something with it - I don't like TOO many tags up there, just the once likely to get some attention. Most of those FSK stations are encrypted and doing things like TDoA on them wasn't something I saw many folks do. For the few stations you can do something with, they are already on the dropdowns for the FSK/NAVTEX extensions and they decode fine. I will go and add the NAVTEX from Boston though.
I did the following - make a rule to both log and drop it:
iptables -N LOG_DROP
iptables -A LOG_DROP -j LOG --log-prefix "INPUT:DROP: " --log-level 6
iptables -A LOG_DROP -j DROP
iptables -I INPUT -s 18.104.22.168/24 -j LOG_DROP
then make those rules persistent:
sudo apt install iptables-persistent
OR if this package was already installed:
iptables-save > /etc/iptables/rules.v4
You can check on the attempts by:
dmesg | grep INPUT:DROP | tail -10
and adjust the number at the end for the number of line items you'd like listed; 10 fits within the admin console window.