Source IP Based Pool Routing
Problem this snippet solves: I had an issue where my company wanted to have more than one mail server sending mail out of our building, they wanted to start sending ¨information emails¨ out but we found that we started to get black listed by mail servers on our main email server due to the ¨information¨ mail servers were using it's external address to send. To get around this I have written this iRule (with the help of the Dev Central Guys) which looks at the source IP of the client and then re-directs to a set pool, then if the source address doesn't match it will use a default pool. You can use this iRule to point any port as long as a virtual server is there listening for that port, you will also need a SNAT pool too. Code : when CLIENT_ACCEPTED { if { [IP::client_addr] equals "*.*.*.*" } { pool ¨enter pool name¨ #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" } elseif { [IP::client_addr] equals "*.*.*.*" } { pool ¨enter pool name¨ #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" } elseif { [IP::client_addr] equals "*.*.*.*" } { pool ¨enter pool name¨ #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" } elseif { [IP::client_addr] equals "*.*.*.*" } { pool ¨enter pool name¨ #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" } else { snatpool ¨enter pool name¨ #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" } } ### update by cmbhatt to switch ### when CLIENT_ACCEPTED { switch -glob [IP::client_addr] { "*.*.*.*" { #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" pool poolname } "*.*.*.*" { #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" pool poolname } default { #Uncomment the line below to turn on logging. #log local0. "Valid client IP: [IP::client_addr] - HostName" snatpool pooname3 } } }