The following examples of JSON and a JSON schema provide explanations of each property. It's helpful to use a five-tuple filter (source subnet, destination subnet, source port, destination port, protocol) and TCP flags (SYN, ACK, FIN, URG, PSH, RST) when you're isolating problems in high-volume traffic. You can capture one-way or bi-directional traffic, IKE and ESP traffic, and inner packets along with filtering on a VPN gateway. You can also run packet capture on multiple tunnels at the same time. You can run VPN Gateway packet capture on the gateway or on a specific connection, depending on your needs. VPN Gateway packet capture filtering capabilities You can use VPN Gateway packet capture together with commonly available packet capture tools. The filtering capabilities provided by Azure VPN Gateway packet capture are a major differentiator. Getting relevant packet captures with these tools can be cumbersome, especially in high-volume traffic scenarios. There are some commonly available packet capture tools. After you narrow down the problem, it's more efficient to debug and take remedial action.
It can help you determine whether the problem is on the customer side of the network, the Azure side of the network, or somewhere in between. Packet capture can help you narrow down the scope of a problem to certain parts of the network. It can take significant time and effort just to narrow down the cause of the problem. Connectivity and performance-related problems are often complex.
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