Here,s why the other options are not as suitable:
B). Implement DNAT rules in a Service Gateway: This approach would work within your VCN for private traffic, but it wouldn,t affect external users accessing the legacy domain. Service Gateway is primarily for routing internal traffic between subnets.C. Set up a NAT Gateway with the new website,s IP address: This might work for basic redirection, but it would require complex configurations and wouldn,t offer the flexibility and control provided by DNS records. Additionally, NAT Gateways incur extra charges compared to DNS.D. Utilize OCI Traffic Management with forwarding rules: While Traffic Management can handle website traffic routing, it,s generally used for more advanced scenarios like load balancing and failover. For simple domain redirection, DNS CNAME records are more efficient.Using CNAME records with OCI DNS offers several advantages:
Simple and efficient: CNAME records are specifically designed for domain aliases, making them the most straightforward approach for redirection.
Cost-effective: OCI DNS offers affordable pricing compared to other options like NAT Gateways.
Flexible control: You can create multiple CNAME records for different subdomains or redirect traffic based on specific conditions.
Fast propagation: DNS changes propagate quickly, ensuring users are directed to the new website promptly.