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There can be a few reasons why OpenStack instances may not be able to connect to the internet when using ovs implementation:

1. Misconfiguration: The network configuration may not be set up properly, such as incorrect IP addresses or incorrect gateway settings.

2. Firewall rules: Firewall rules may be blocking traffic from the instances to the internet.

3. NAT configuration: NAT may not be configured properly, which can prevent instances from accessing the internet.

4. DNS configuration: DNS may not be configured properly, which can prevent instances from resolving domain names.

5. Network congestion: If there is network congestion or high utilization, instances may not be able to connect to the internet due to limited bandwidth.

Overall, troubleshooting network issues with OpenStack instances requires a thorough understanding of network configuration, firewall rules, NAT, DNS, and network congestion.