iRule: persist uie "$var1:$var2"

You can use the

session

command to build and lookup a separated table.

Depending on which party provides the framed IP one of the following rules will be applied to your RADIUS virtual:

Client provides framed IP:

 rule for radius in case client provides the framed IP
when LB_SELECTED {
    log local0. "session table entry added: "
    session add uie "persist:[RADIUS::avp 8]" [LB::server addr]
}

Server provides framed IP:

 rule for radius in case server provides the framed IP
when SERVER_DATA {
    log local0. "session table entry added: "
    session add uie "persist:[RADIUS::avp 8]" [IP::remote_addr]
}

The following one will be bound to your virtual server for HTTP (may be used in context of CLIENT_ACCEPTED as well):

 rule for webservice
when HTTP_REQUEST {
   log local0. "session table lookup result: [session lookup uie "persist:[IP::client_addr]"]"
   if {[session lookup uie "persist:[IP::client_addr]"] ne ""} {
       log local0. "lookup match: [session lookup uie "persist:[IP::client_addr]"]"
       node [session lookup uie "persist:[IP::client_addr]"]
   }
}

I don´t have a RADIUS up and running for testing but replicated it with another service in v11.5.1.

Perhaps you need to adjust the RADIUS part.

Thanks, Stephan