this is half a minute work with any firewall, but with the built-in firewall on Windows 2008 R2, I am stuck here for half an hour.
I want to block all incoming ICMP requests to my server, EXCEPT those IP addresses that I want. My firewall policy is to "Block all inbound requests that do not satisfy a rule"
1st attempt: I create an allow rule for only those IPs that I want. The firewall should allow only those and block all others. Result: It allows everything.
2nd attempt I create a Block rule for ICMP and for Any IP. Then I keep the same Allow rule as in 1st attempt. Result: It blocks everything.
What am I missing here ?
OK. I give up. The only thing that I can do is to Block all addresses using as scope those ranges that leave out all the IPs that I want to be allowed.
For example if I want to allow IP 100.100.100.100 is set the scope:
- from 0.0.0.0 to 100.100.100.99
- from 100.100.100.101 to 255.255.255.255
I wish there was another way.