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how to calculate the Tsval for real time

asked 2018-09-18 17:49:43 +0000

Flycow gravatar image

Currently, i install TCPDUMP to get all the packets between a cellphone and a camera. i want to know when a packet is sent from the camera, how can i use the value TSVAL,What is the unit? ms or us or any other unit based on the processor?

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answered 2018-09-18 19:22:51 +0000

cmaynard gravatar image

While the TCP timestamp option is defined in section 3.2 of RFC1323, "TCP Extensions for High Performance", the timestamp clock itself is described later in section 4.2.2, with the following statement of particular relevance:

     Based upon these considerations, we choose a timestamp clock
     frequency in the range 1 ms to 1 sec per tick.

Basically, the value is implementation dependent.

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Thank you very much!

Flycow gravatar imageFlycow ( 2018-09-20 02:58:26 +0000 )edit

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Asked: 2018-09-18 17:49:43 +0000

Seen: 70 times

Last updated: Sep 18