Invalid subnet for class B range above 192.x.x.x?
I'm trying to block my ISP from scanning port 25 and seeing a SMTP mail
server using my Win2K SP4 server's IPSEC policies.
I suspect they scan using an IP address in the following address range:
126.96.36.199 - 188.8.131.52 (CIDR=184.108.40.206/16)
( see [url]http://ws.arin.net/whois/?queryinput=220.127.116.11[/url] )
When I try to enter in this subnet, as IP=18.104.22.168, mask=255.255.0.0, in
the IPSec Policy editor's rule/IP filter list/filter properties, I get an
"This is an invalid mask for the specified IP address."
How do I pull this off for Class B ranges above 192.0.0.0?