I am new to palo alto and already read the article you referred to. On that article it mentioned
I want to capture packet on the physical interface itself, which the document says not possible if I am not wrong. Please clarify if possible.
this is correct, but this is an architectual consideration: the hardware architecture is built around the chips on the board, so all packets are forwarded to the dataplane chips for processing and it is there that packets can be intercepted
the only scenario where a packetcapture would not be able to capture a packet, is if they are so malformed that they cannot be forwarded to the dataplane, or (in the case of a larger platform) the packets are part of an already offloaded flow (so if you need to packetcapture an entire session, you need to make sure offloading is disabled)
hope this helps
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