c1
--

+ ip tcp_metrics show
10.4.0.67 age 74.200sec cwnd 10 rtt 1602us rttvar 2245us source 10.4.0.50
10.4.0.66 age 0.040sec cwnd 16 rtt 3202us rttvar 4998us source 10.4.0.50
192.168.119.82 age 7.404sec ssthresh 5 cwnd 10 rtt 81878us rttvar 67049us source 192.168.115.50
10.4.0.50 age 74.424sec cwnd 10 rtt 1847us rttvar 3287us source 10.4.0.50
10.4.0.82 age 0.314sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 74.484sec cwnd 10 rtt 1717us rttvar 3020us source 10.4.0.82
192.168.115.50 age 7.258sec cwnd 10 rtt 81648us rttvar 65578us 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 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 121708 bytes 1486 pkt (dropped 0, overlimits 0 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          2us
  sp_delay          1us
  backlog            0b
  pkts             1486
  bytes          121708
  way_inds            0
  way_miss            4
  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 2295132 bytes 2229 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 2363852 bytes 2230 pkt (dropped 0, overlimits 798 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 20032b 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        239us
  av_delay         85us
  sp_delay          2us
  backlog            0b
  pkts             2230
  bytes         2363852
  way_inds            0
  way_miss            4
  way_cols            0
  sce                 0
  marks               0
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len          9084
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 101022 bytes 1487 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 2364232 bytes 2234 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 122190 bytes 1492 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0