Precise Time Protocol (PTP)
PTP is used to synchronize the clock of a network client with a server (similar to NTP). However, PTP is mainly used in LANs, with much higher precision than NTP (usually 10's of microseconds to 10's of nanoseconds). Is is specified in IEEE 1588.
For a detailed history, see http://www.nist.gov/el/isd/ieee/intro1588.cfm.
Delay Request Message
Delay Response Message
The PTP dissector seems to work properly.
There are no preference settings affecting PTP.
Example capture file
A complete list of PTP display filter fields can be found in the display filter reference
- Show only the PTP based traffic:
- Capture only the PTP traffic over the default UDP ports (319 and 320):
udp port 319 or udp port 320Capture only the PTP traffic over the default Ethernet type (0x88F7):
ether proto 0x88F7