Mounting network access from Internal floating IP

Hello,

I have a cluster of BIG-IP running APM. Users reach it from its external VS.

I would like to implement an end to end monitoring (mounting a network access with the edge client) from the INTERNAL VLAN (and internal floating IP).

What is the easiest and cleanest way of doing this please?

I tried this Irule on an internal VS but it didn't work:

when HTTP_REQUEST {
    virtual test2_vs
}