c1
--

+ ip tcp_metrics show
10.4.0.67 age 77.401sec cwnd 10 rtt 3809us rttvar 5298us source 10.4.0.50
10.4.0.66 age 0.181sec source 10.4.0.50
192.168.119.82 age 11.868sec ssthresh 14 cwnd 15 rtt 4124us rttvar 3459us source 192.168.115.50
10.4.0.50 age 77.596sec cwnd 10 rtt 1920us rttvar 2997us source 10.4.0.50
10.4.0.82 age 0.181sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 77.744sec cwnd 10 rtt 1688us rttvar 2996us source 10.4.0.82
192.168.115.50 age 11.871sec cwnd 10 rtt 871us rttvar 523us 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 9293804 bytes 140098 pkt (dropped 0, overlimits 67 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 2176b 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          2us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           140098
  bytes         9293804
  way_inds            0
  way_miss            6
  way_cols            0
  sce                 0
  marks               0
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len           722
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 367202854 bytes 250394 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 377074754 bytes 250393 pkt (dropped 0, overlimits 376715 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 1039056b 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        3.5ms
  av_delay        2.9ms
  sp_delay          1us
  backlog            0b
  pkts           250393
  bytes       377074754
  way_inds            0
  way_miss            6
  way_cols            0
  sce            115381
  marks             910
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         16654
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 7332476 bytes 140097 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
 Sent 377075236 bytes 250399 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
 Sent 9294184 bytes 140102 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0