Packets difference between PTP and gPTP

Shir asked:

I’m trying to understand few things about gPTP (IEEE 802.1AS). I am using the open source implementation by AVnu (

I looking on the packets using Wireshark, and they are parsed as PTPv2 packets.

Is there any protocol difference between the packets themselves that can be used to understand whether a certain traffic is gPTP or normal PTP? I know that gPTP only extends PTP, but I thought there would be a detectable difference.


My answer:

gPTP is a profile of PTPv2; it implements some additional features.

Wireshark should be able to decode everything which may be of interest to you. If it does not, then you can file an enhancement request.

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