to avoid these where possible, or use dedicated ports when needed.
HTTP and TLS do not share this constraint, as routing is done based on the hostname/SNI.</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.12/img/icons.svg#callout-warning"/></svg></div><div class=content>Without Istio, the <code>ports</code> field of an ExternalName service is not required because the Service only represents a DNS entry.
However, with Istio the port must be declared in the S