1. Create an additional IngressRouter with domains names including apps. for ex: example.test-apps.<clustername>.<clusterdomain>
2. Create and configure the external LB corresponding to the additonal IngressController
3. Configure the corporate DNS server and create records for the this additional IngressController resolving to the LB Ip setup in step 2 above.
4. Try resolving the additional domain routes from outside cluster and within cluster, the DNS resolution works fine fro outside cluster. However within cluster all additional domains consisting apps in the domain name resolve to the default ingress VIP instead of their corresponding LB IPs configured on the corportae DNS server.
As an alternate and simple test to reroduce you can reproduce it simply by using the dig command on the cluster node with the additinal domain
sh-4.4# dig test.apps-test..<clustername>.<clusterdomain>