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Figure 2. Blocking rules after adding the rule to accept SNMP

# ipfw -n list b
Type    Proto        From                 To             Ports
deny    udp   anywhere            192.168.1.1/32      any -> any
deny    udp   anywhere            20.2.51.105/32      any -> any
accept  udp   anywhere            20.2.51.105/32      domain -> any
accept  udp   anywhere            20.2.51.105/32      any -> snmp
deny    tcp   anywhere            20.2.51.105/32      any -> any
deny    tcp   anywhere            192.168.1.1/32      any -> any
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