I am trying to figure out the clock drift of the machines using my router/Internet. Based on other posts[1][2], I am led to believe clock drift information can be found in RTP packets. However, after filtering for "rtp" packets in Wireshark, I find none. According to [3], UDP packets can be converted into RTP packets. So, I tried enabling the "rtp_udp" protocol. I still only see UDP and no RTP packets. I also tried selecting a UDP packet then: Analyze -> Decode As -> RTP (in the Current column). It seems like the UDP packet is converted, but I don't see clock drift information.
[1] https://osqa-ask.wireshark.org/questions/23220/how-does-wirehark-calculate-the-clock-drift-for-rtp [2] https://osqa-ask.wireshark.org/questions/24420/how-to-identify-rtp-delay [3] https://osqa-ask.wireshark.org/questions/56472/i-see-udp-i-want-rtp