The default interface is “inside.” If an interface other than
inside is used, a security warning like the one shown in the next example
appears, but the entry will be accepted.
Pix(config)# snmp-server host 192.168.1.3
Pix(config)# snmp-server host dmz 192.168.2.3 trap
Warning: Sending SNMP traps to a non-inside interface may be insecure
Pix(config)#