HTTP/HTTPS Asymmetric-Routing iRule

Hello, No, it's asymmetric in the Egress-Flow (From the end-user to Internet) and Ingress-Flow (From the Internet to end-user). The Egress traffic (upload) is going to one site, and the Ingress traffic (download) is going to a different site. This is correct under some failure scenario in the network. Note that; this is all transparent to the end user. Both sites have Proxies behind the LTM; so from the networking part I can get the traffic back to the right site by an idea but I'm not sure if I can achieve it through an iRule. I need the LTM to check the Ingress-Traffic if it comes from specific source-ports and this traffic is not showing in the connection-table, then it will forward the traffic to another pool. Thnx, Aziz