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How do I filter/capture/read packets of one protocol embedded in another?

I'm trying to read a tapped line (using Tap Aggregator) for the DNP traffic, but it appears to all be encapsulated in TCP packets, so the filter isn't showing any when I filter for dnp3.

How do I borg down another level in Wireshark?

How do I filter/capture/read packets of one protocol embedded in another?

I'm trying to read a tapped line (using a Tap Aggregator) for the DNP traffic, but it appears to all be encapsulated in TCP packets, so the filter isn't showing any when I filter for dnp3.

How do I borg down another level in Wireshark? Wireshark?

How do I filter/capture/read packets of one protocol embedded in another?

I'm trying to read a tapped line (using a Tap Aggregator) for the DNP traffic, but it appears to all be encapsulated in TCP packets, so the filter isn't showing any anything when I filter for dnp3.

How do I borg down another level in Wireshark?

How do I filter/capture/read packets of one protocol embedded in another?

I'm trying to read a tapped line (using a Tap Aggregator) for the DNP traffic, but it appears to all be encapsulated embedded in the TCP packets, so the filter isn't showing anything when I filter for dnp3.

How do I borg down another level in Wireshark?