A company has established a connection from its on-premises data center to Amazon EC2 instances within its AWS account using a Border Gateway Protocol (BGP) based AWS VPN. The development team is able to access an EC2 instance located in subnet A but encounters issues when trying to access an EC2 instance located in subnet B, both of which reside within the same Virtual Private Cloud (VPC).

To troubleshoot and verify if the traffic is reaching subnet B, which logs should be utilized?