Packet capture on physical interface

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L0 Member

Packet capture on physical interface

I want to take packet capture on the physical interface or the subinterface. Basically I want to check the communication on internal interface.  Can anyone help me out ? 

Community Manager

Re: Packet capture on physical interface

hi @msid1978 

 

Check out this article: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClTJCA0


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L0 Member

Re: Packet capture on physical interface

Hi Reaper,

 

I am new to palo alto and already read the article you referred to. On that article it mentioned

 

  • Packets are captured on the dataplane vs on the interface (this explains the next bullet).

 

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. 

 

Community Manager

Re: Packet capture on physical interface

hi @msid1978 

 

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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