Using access-list to block an IP address:

access-list 101 deny ip 210.78.31.0 0.0.0.255 any



Cisco IOS access-list uses a backwards subnet, please 
use the following example:

          255.255.255.255       Use this to subtract
        - 255.255.255.0 your subnet
        ----------------
        = 0.0.0.255       becomes the access-list subnet

Regards,
Tom
Image`fx



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