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What kind of DHCP server is in play? I've found the best way is to create a seperate scope on the DHCP server and make a rule for the address range or make an authentication rule for traffic destined for sql ports, then supply a username and password...
you have to add icmp to your inspection rules for ping to work. Also you have auto config on your dhcp scope without specifying a DNS server.. Try dns domain-lookup outsidedns server-group group name-server 4.2.2.1
