c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.584sec cwnd 10 rtt 3494us rttvar 4903us source 10.4.0.50
10.4.0.66 age 0.054sec cwnd 17 rtt 5066us rttvar 8776us source 10.4.0.50
192.168.119.82 age 10.057sec ssthresh 5 cwnd 81 rtt 81352us rttvar 43338us source 192.168.115.50
10.4.0.50 age 76.814sec cwnd 10 rtt 4380us rttvar 5923us source 10.4.0.50
10.4.0.82 age 0.316sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.827sec cwnd 10 rtt 1735us rttvar 3015us source 10.4.0.82
192.168.115.50 age 9.897sec cwnd 10 rtt 81375us rttvar 46897us source 192.168.119.82


m1
--

+ iptables -t mangle -L POSTROUTING -n
Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
TOS        tcp  --  0.0.0.0/0            0.0.0.0/0            tcp flags:!0x17/0x02 DSCP match 0x01 TOS set 0x01/0xff


m2
--

+ tc -s -d qdisc show dev ens192
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 6633632 bytes 99792 pkt (dropped 0, overlimits 152 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 4352b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /     722
 min/max overhead-adjusted size:       42 /     722
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay          3us
  av_delay          2us
  sp_delay          1us
  backlog            0b
  pkts            99792
  bytes         6633632
  way_inds            0
  way_miss            6
  way_cols            0
  sce                 0
  marks               0
  drops               0
  ack_drop            0
  sp_flows            1
  bk_flows            1
  un_flows            0
  max_len           722
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 281899200 bytes 192618 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ens224
qdisc cake 1: root refcnt 2 bandwidth 50Mbit besteffort flows nonat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0 sce 
 Sent 289607790 bytes 192619 pkt (dropped 0, overlimits 242271 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 1698976b of 4Mb
 capacity estimate: 50Mbit
 min/max network layer size:           42 /    1514
 min/max overhead-adjusted size:       42 /    1514
 average network hdr offset:           14

                  Tin 0
  thresh         50Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay        379us
  av_delay        235us
  sp_delay          2us
  backlog            0b
  pkts           192619
  bytes       289607790
  way_inds            0
  way_miss            6
  way_cols            0
  sce             12949
  marks              18
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         10598
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5236662 bytes 99793 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000 delay 40.0ms
 Sent 289608170 bytes 192623 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d qdisc show dev ifb4ens224
qdisc netem 1: root refcnt 2 limit 1000000 delay 40.0ms
 Sent 6634114 bytes 99798 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0