A VIP is configured on a F5 LB and is listening on port 80 and 443.
The VIP is reachable from internet meaning reply from pool nodes behind the VIP is fine.
However, the same VIP is NOT rechable from another poolA servers on the same F5 LB. As a workaround, a host entry is made on the poolA servers and the VIP is reachable from the poolA servers.
VIP should be reachable directly from the poolA server with out the host entry.