Forum Discussion
Load Balancing based on Port
Is there a was in iRules to send traffic to a Pool based on port that the client is sending trafic to. I know you can do IP::addr is there a IP::Port? Thanks
Sure, there's a way but it's not in the "IP" namespace. Think of IP as the base class and TCP and UDP are classes derived from IP.
In the "IP" namespace you can access the addresses
IP::remote_addr, IP::local_addr, IP::client_addr, IP::server_addr
And from TCP and UDP you can access the ports with these values
TCP::remote_port, TCP::local_port, TCP::client_port, TCP::server_port
UDP::remote_port, UDP::local_port, UDP::client_port, UDP::server_port
The "server_port" values are only valid when withing the serverside context (server response). If you want to load balance based on the destinaion port of the service (ie, using a wildcard virtual server), use the "local_port". If you want to load balance based on the client's source port (not sure why you'd want to do this), you could with the "client_port" value.
Also, if you are using a HTTP profile, you can access the port in the HTTP request with the HTTP::port value.
This reminds me that I need to get back on finalizing the documentation for my iRules cheat sheet...
-Joe
