StartPingCheck

Message Layout

{
        StartPingCheck High NotTrusted Unencoded
        {
                PingID Single
                {       PingID  U8      }
                {       OldestUnacked   U32     }
        }
}

Usage and Notes

• Used to measure circuit ping times.
• PingID is increased by 1 each time StartPingCheck is sent by the source.
  • The recipient is expected to respond with CompletePingCheck and return this PingID back to the source.
• OldestUnacked is simply the sequence number (see Packet Layout) of the most recent message sent by the source (excluding this packet), regardless of whether that message was sent reliably.