c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.367sec cwnd 10 rtt 3247us rttvar 4721us source 10.4.0.50
10.4.0.66 age 0.193sec source 10.4.0.50
192.168.119.82 age 9.397sec ssthresh 5 cwnd 85 rtt 81784us rttvar 43601us source 192.168.115.50
10.4.0.50 age 76.546sec cwnd 10 rtt 4516us rttvar 6575us source 10.4.0.50
10.4.0.82 age 0.193sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.665sec cwnd 10 rtt 1689us rttvar 3029us source 10.4.0.82
192.168.115.50 age 9.351sec cwnd 10 rtt 81386us rttvar 46820us 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 6458114 bytes 97133 pkt (dropped 0, overlimits 113 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            97133
  bytes         6458114
  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 275072150 bytes 187993 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 282603984 bytes 187992 pkt (dropped 0, overlimits 243911 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 90312b 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        684us
  av_delay        484us
  sp_delay          2us
  backlog            0b
  pkts           187992
  bytes       282603984
  way_inds            0
  way_miss            6
  way_cols            0
  sce             14774
  marks              14
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         15140
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5098296 bytes 97132 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 282604466 bytes 187998 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 6458494 bytes 97137 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0