I've managed to use below command to block ip address:
/sbin/route add -host 188.8.131.52 reject
How do I view if this is in the list? How do I view all IP's that are currently blocked?
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will display the current rules. You should see something like this:
[user@host ~]$ sudo /sbin/route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface KD111111111011. - 255.255.255.255 !H 0 - 0 -
This isn't too viewer friendly, but the Destination is the IP without any .'s in it. 11 became 011 because it uses 3 places for each octet.