GRE-In-UDP Tunnel Decapsulation
Required License- Advanced Tunneling license on GigaVUE‑HC3. Referred to as “Tunneling license” on GigaVUE‑HC1.
The GRE-In-UDP tunnel is a new tunnel type that supports decapsulating the GRE-in-UDP headers in the vTAP captured data packets. The decapsulation of the tunnel headers is common for both control and data packets. However, the control packets (with JSON metadata format) are dropped based on the GRE Key value '0'. The data packets (either fragmented or unfragmented) are handled as follows:
| S. No | Process | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |
Reassembly of fragmented data packets (if fragmented packets are received) |
The fragmented packets are reassembled based on standard IP header-based reassembly using the following fields:
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| 2 |
Decap tunnel lookup |
The ingress packet fields are parsed to find a matching Tunnel End Point (TEP) based on the following header fields:
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| 3 |
Decapsulation of headers |
If a matching TEP is found, the encapsulation headers in the packet are removed and the packet is forwarded to the PCAPng application. Refer to the PCAPng Application section for more details. |
Note: Refer to the "Add Applications to Monitoring Session" topic in the respective Cloud (GigaVUE V Series Solution) Guides for detailed information.
