It sounds like the problem isn't "it picked the subnet I didn't want"
but rather "different instances of ptp4l didn't consistently pick the
same subnet, but I don't really care which one they pick as long as
it's stable"?
If it's the former, I'd rather see some sort of option that lets you
specify the subnet. However, being deterministic is reasonably
useful.
Is my description of the second option accurate? Can you describe the
symptoms that happen when the wrong subnet is chosen?
This issue and patch precede me, and the historical information is
incomplete, so I recompiled without our patch and ran some tests.
I'd put the problem in the "it picked the subnet I didn't want" bucket.
Worse, it (ptp4l) also picked the "wrong" interface.
Without the patch, ptpl4 is sending Sync and Announce messages out the
incorrect interface and using a source IP address that isn't on the "-i"
argument interface.
ptp4l is bound to eno1 which has two address:
169.254.52.4/16
169.254.53.4/16
But Sync and Announce traffic is being sourced from 10.10.100.188, which
is on en02. Oy vey!
Note, I'm building off the 2.0.0 tag, but that makes no difference. The
multicast binding code hasn't changed.
Below is a data dump.
Rebuilding with the patch back in then traffic is sourced from the
correct interface. With multiple IP addresses on the interface, it
appears the traffic is sourced from the IP address with the lowest address.
= = = = = = = = =
octoscope@SuperMicro:~$ ps ax | grep ptp
2003 ? Ss 0:00 /usr/local/sbin/ptp4l -i eno1 -f
/usr/local/etc/linuxptp/ptp4l.conf -m -q
3850 ? Ss 0:00 /usr/local/sbin/phc2sys -s CLOCK_REALTIME -c
/dev/ptp0 -f /usr/local/etc/linuxptp/ptp4l.conf -m -q -w
= = = = = = = = =
octoscope@SuperMicro:~$ ethtool -T eno1
Time stamping parameters for eno1:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
= = = = = = = = =
octoscope@SuperMicro:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
group default qlen 1000
link/ether ac:1f:6b:1b:8b:c0 brd ff:ff:ff:ff:ff:ff
inet 169.254.52.4/16 brd 169.254.255.255 scope link noprefixroute eno1
valid_lft forever preferred_lft forever
inet 169.254.53.4/16 brd 169.254.255.255 scope link secondary
noprefixroute eno1
valid_lft forever preferred_lft forever
inet6 fe80::520a:9c21:95be:5b0a/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: eno2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
group default qlen 1000
link/ether ac:1f:6b:1b:8b:c1 brd ff:ff:ff:ff:ff:ff
inet 10.100.100.188/24 brd 10.100.100.255 scope global dynamic
noprefixroute eno2
valid_lft 259006sec preferred_lft 259006sec
inet6 fe80::d8e:f266:544b:7274/64 scope link noprefixroute
valid_lft forever preferred_lft forever
4: eno3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state
DOWN group default qlen 1000
link/ether ac:1f:6b:1b:8c:ec brd ff:ff:ff:ff:ff:ff
5: eno4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state
DOWN group default qlen 1000
link/ether ac:1f:6b:1b:8c:ed brd ff:ff:ff:ff:ff:ff
6: br-065bfd282d7c: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue state UP group default
link/ether 02:42:26:5e:4a:03 brd ff:ff:ff:ff:ff:ff
inet 172.28.0.1/16 brd 172.28.255.255 scope global br-065bfd282d7c
valid_lft forever preferred_lft forever
inet6 fe80::42:26ff:fe5e:4a03/64 scope link
valid_lft forever preferred_lft forever
7: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
state DOWN group default
link/ether 02:42:2d:8f:ca:2f brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
valid_lft forever preferred_lft forever
9: veth06d724e@if8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether c6:fe:7f:c2:10:a3 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet6 fe80::c4fe:7fff:fec2:10a3/64 scope link
valid_lft forever preferred_lft forever
11: vethb7a6f3b@if10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether 32:ad:77:18:09:6b brd ff:ff:ff:ff:ff:ff link-netnsid 1
inet6 fe80::30ad:77ff:fe18:96b/64 scope link
valid_lft forever preferred_lft forever
13: veth32e8e1e@if12: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether 0e:18:50:70:d0:89 brd ff:ff:ff:ff:ff:ff link-netnsid 2
inet6 fe80::c18:50ff:fe70:d089/64 scope link
valid_lft forever preferred_lft forever
15: veth28b1f09@if14: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether fe:68:30:3e:d9:b1 brd ff:ff:ff:ff:ff:ff link-netnsid 3
inet6 fe80::fc68:30ff:fe3e:d9b1/64 scope link
valid_lft forever preferred_lft forever
17: veth3485d29@if16: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether da:c4:3c:52:d4:aa brd ff:ff:ff:ff:ff:ff link-netnsid 4
inet6 fe80::d8c4:3cff:fe52:d4aa/64 scope link
valid_lft forever preferred_lft forever
19: veth0495409@if18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
noqueue master br-065bfd282d7c state UP group default
link/ether be:85:b9:27:af:50 brd ff:ff:ff:ff:ff:ff link-netnsid 5
inet6 fe80::bc85:b9ff:fe27:af50/64 scope link
valid_lft forever preferred_lft forever
=========================
No. Time Source Destination
Protocol Length Info
1 0.000000000 10.100.100.188 224.0.1.129
PTPv2 86 Sync Message
Frame 1: 86 bytes on wire (688 bits), 86 bytes captured (688 bits) on
interface 0
Ethernet II, Src: SuperMic_1b:8b:c0 (ac:1f:6b:1b:8b:c0), Dst:
IPv4mcast_01:81 (01:00:5e:00:01:81)
Internet Protocol Version 4, Src: 10.100.100.188, Dst: 224.0.1.129
User Datagram Protocol, Src Port: 319, Dst Port: 319
Source Port: 319
Destination Port: 319
Length: 52
Checksum: 0x0764 [unverified]
[Checksum Status: Unverified]
[Stream index: 0]
Precision Time Protocol (IEEE1588)
0000 .... = transportSpecific: 0x0
.... 0000 = messageId: Sync Message (0x0)
.... 0010 = versionPTP: 2
messageLength: 44
subdomainNumber: 0
flags: 0x0200
correction: 0.000000 nanoseconds
ClockIdentity: 0xac1f6bfffe1b8bc0
SourcePortID: 1
sequenceId: 216
control: Sync Message (0)
logMessagePeriod: 0
originTimestamp (seconds): 0
originTimestamp (nanoseconds): 0
No. Time Source Destination
Protocol Length Info
2 0.000029588 10.100.100.188 224.0.1.129
PTPv2 86 Follow_Up Message
Frame 2: 86 bytes on wire (688 bits), 86 bytes captured (688 bits) on
interface 0
Ethernet II, Src: SuperMic_1b:8b:c0 (ac:1f:6b:1b:8b:c0), Dst:
IPv4mcast_01:81 (01:00:5e:00:01:81)
Internet Protocol Version 4, Src: 10.100.100.188, Dst: 224.0.1.129
User Datagram Protocol, Src Port: 320, Dst Port: 320
Source Port: 320
Destination Port: 320
Length: 52
Checksum: 0x2c63 [unverified]
[Checksum Status: Unverified]
[Stream index: 1]
Precision Time Protocol (IEEE1588)
0000 .... = transportSpecific: 0x0
.... 1000 = messageId: Follow_Up Message (0x8)
.... 0010 = versionPTP: 2
messageLength: 44
subdomainNumber: 0
flags: 0x0000
correction: 0.000000 nanoseconds
ClockIdentity: 0xac1f6bfffe1b8bc0
SourcePortID: 1
sequenceId: 216
control: Follow_Up Message (2)
logMessagePeriod: 0
preciseOriginTimestamp (seconds): 1552671081
preciseOriginTimestamp (nanoseconds): 604860668
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