I have set up mod_evasive and mod_remoteip to change the proxy headers from the load balancer's to the client's actual ip.
But I am running into problems when using mod evasive. at the moment, my configuration for mod evasive is:
DOSHashTableSize 3097
DOSPageCount 1
DOSSiteCount 2
DOSPageInterval 1
DOSSiteInterval 1
DOSBlockingPeriod 100
From what I understand, the above config will allow at the most 1 request to a page per second , or at the most 2 pages anywhere in the website per second.
However, the problem is , the ip address of the load balancer is not static, and so when it tries to perform a health check , mod evasive blocks the load balancer. This results in the ELB thinking that the ec2 instance is not healthy.
What should I do to prevent this problem ? Is it possible to whitelist ip addresses by dns name ? My ELB DNS name is:
something-experimental-lb-123411.ap-northeast-1.elb.amazonaws.com If not, what other options do I have ?