p-allocation-where-possible>Automatic VIP allocation where possible</h3><p>You may ask, how does this DNS functionality in the agent solve the
problem of distinguishing between multiple external TCP services
without VIPs on the same port?</p><p>Taking inspiration from Kubernetes, Istio will now automatically
allocate non-routable VIPs (from the Class E subnet) to such services
as long as they do not use a wildcard host. The Istio agent on the
sidecar will use the VIPs as responses to the DNS lookup queries 