IPv4 address not getting assigned with Dual stack VM

Steps:

1. Create Router
2. Create Network(mynet1)
3. Create IPv6 Subnet(S1)
4. Add IPv6 Subnet to Router
5. Boot VM1 and check IPv6 address assigned --> PASS
6. Create IPv4 subnet(s2) and attach to Router
7. Boot VM2 and check Both IPv4 and IPv6 address assgned.–>PASS
8. Now login to IPv6 VM(VM1) and check whether it received IPV4 address too, since it become dual stack VM. --> FAIL
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