c1
--

+ ip tcp_metrics show
10.4.0.67 age 77.371sec cwnd 10 rtt 3418us rttvar 4773us source 10.4.0.50
10.4.0.66 age 0.179sec source 10.4.0.50
192.168.119.82 age 12.024sec ssthresh 26 cwnd 26 rtt 14678us rttvar 9554us source 192.168.115.50
10.4.0.50 age 77.568sec cwnd 10 rtt 4459us rttvar 5901us source 10.4.0.50
10.4.0.82 age 0.179sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 77.693sec cwnd 10 rtt 1721us rttvar 3001us source 10.4.0.82
192.168.115.50 age 12.029sec cwnd 10 rtt 11025us rttvar 6371us 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 9024788 bytes 136022 pkt (dropped 0, overlimits 362 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          2us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           136022
  bytes         9024788
  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 365130142 bytes 249103 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 375124524 bytes 249102 pkt (dropped 0, overlimits 370948 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 106088b 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        3.3ms
  av_delay        2.6ms
  sp_delay          1us
  backlog            0b
  pkts           249102
  bytes       375124524
  way_inds            0
  way_miss            6
  way_cols            0
  sce            143294
  marks             267
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len          7570
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 7120524 bytes 136021 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 5.0ms
 Sent 375125006 bytes 249108 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 5.0ms
 Sent 9025168 bytes 136026 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0