Forum Discussion
There is a bunch out there for this scenario, the search box in the top right corner is your friend.. ;)
A good article to read on connection limiting via an irule by Colin
https://devcentral.f5.com/articles/iruleology-connection-limiting-take-2
Code share links:
Virtual server connection limit with HTTP response https://devcentral.f5.com/wiki/iRules.virtual_server_connection_limit_with_HTTP_response.ashx
virtual server connection rate limit with tables https://devcentral.f5.com/wiki/iRules.virtual_server_connection_rate_limit_with_tables.ashx
a couple random conversations
source & destination example - https://devcentral.f5.com/questions/irule-to-limit-connections-from-source-ip-to-destination-ip
another https://devcentral.f5.com/questions/help-need-to-create-a-irule-for-limit-client-connection