Setup WAF in front of ALBs

Pricing Example 1: 

AWS WAF without Managed RulesLet’s assume you start using AWS WAF at the first of the month to protect eight CloudFront web distributions. For this example, we’ll create two web ACLs, one web ACL with four rules associated to six CloudFront web distributions, and another web ACL with six rules associated to two remaining CloudFront web distributions. 

The CloudFront web distributions are expected to receive 10 million requests per month in total.
Web ACLWeb ACL charge = # of web ACLs per month * $5T
otal web ACL charge = 2 * $5 = $10

RuleThe price for a rule is $1 per month (pro-rated by the hour)

Rule charge = # of rules associated per month * $1

Total rule charge = (4 + 6) * $1 = $10

RequestThe price for request is $0.60 per million