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Wireshark dissector does not match spec for IEEE P802.1AS-Rev/D8.0
From: Ari Timonen <Ari.Timonen () synopsys com>
Date: Wed, 20 Jan 2021 10:46:32 +0000
Hello, The time synchronization protocol IEEE P802.1AS dissector does not parse TLV flags correctly. The specification IEEE P802.1AS-Rev/D8.0 page 155 has the correct TLV flags. 1. The computeNeighbourRateRatio is first bit not second. 2. The computeMeanLink delay is the second bit 3. The oneStepReceiveCapable is the third bit. 4. The computeNeighborPropDelay flag does not exist. It could be because the packet is dissected as PTP2 packet. Precision Time Protocol (IEEE1588) 0001 .... = transportSpecific: 0x1 ...1 .... = 802.1as conform: True .... 1100 = messageId: Signalling Message (0xc) 0001 .... = Reserved: 1 .... 0010 = versionPTP: 2 messageLength: 60 subdomainNumber: 0 Reserved: 0 flags: 0x0008 0... .... .... .... = PTP_SECURITY: False .0.. .... .... .... = PTP profile Specific 2: False ..0. .... .... .... = PTP profile Specific 1: False .... .0.. .... .... = PTP_UNICAST: False .... ..0. .... .... = PTP_TWO_STEP: False .... ...0 .... .... = PTP_ALTERNATE_MASTER: False .... .... ..0. .... = FREQUENCY_TRACEABLE: False .... .... ...0 .... = TIME_TRACEABLE: False .... .... .... 1... = PTP_TIMESCALE: True .... .... .... .0.. = PTP_UTC_REASONABLE: False .... .... .... ..0. = PTP_LI_59: False .... .... .... ...0 = PTP_LI_61: False correction: 0.000000 nanoseconds correction: Ns: 0 nanoseconds correctionSubNs: 0 nanoseconds Reserved: 0 ClockIdentity: 0xacde48234567abcd SourcePortID: 1 sequenceId: 1 control: Sync Message (0) logMessagePeriod: 127 targetPortIdentity: 0xffffffffffffffff targetPortId: 65535 Message Interval Request TLV tlvType: Organization extension (3) lengthField: 12 organizationId: IEEE 802 (0x0080c2) OrganizationSubType: 2 linkDelayInterval: 13 timeSyncInterval: 14 announceInterval: 15 flags: 0x07 .... ..1. = computeNeighborRateRatio: True .... .1.. = computeNeighborPropDelay: True Yours, Ari Timonen
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Current thread:
- Wireshark dissector does not match spec for IEEE P802.1AS-Rev/D8.0 Ari Timonen (Jan 20)
- Re: Wireshark dissector does not match spec for IEEE P802.1AS-Rev/D8.0 Alexis La Goutte (Jan 20)
- Re: Wireshark dissector does not match spec for IEEE P802.1AS-Rev/D8.0 Jaap Keuter (Jan 21)
- Re: Wireshark dissector does not match spec for IEEE P802.1AS-Rev/D8.0 Ari Timonen (Jan 26)