c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.246sec cwnd 10 rtt 2078us rttvar 2950us source 10.4.0.50
10.4.0.66 age 0.067sec cwnd 17 rtt 4199us rttvar 6801us source 10.4.0.50
192.168.119.82 age 10.379sec ssthresh 250 cwnd 137 rtt 81872us rttvar 66805us source 192.168.115.50
10.4.0.50 age 76.510sec cwnd 10 rtt 4289us rttvar 6100us source 10.4.0.50
10.4.0.82 age 0.334sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.481sec cwnd 10 rtt 1957us rttvar 3461us source 10.4.0.82
192.168.115.50 age 10.198sec cwnd 10 rtt 82153us rttvar 65522us 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 7585426 bytes 114573 pkt (dropped 0, overlimits 164 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          8us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           114573
  bytes         7585426
  way_inds            0
  way_miss            4
  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 334241226 bytes 227456 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 343355974 bytes 227455 pkt (dropped 0, overlimits 285664 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 426720b 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        396us
  av_delay        193us
  sp_delay          1us
  backlog            0b
  pkts           227455
  bytes       343355974
  way_inds            0
  way_miss            4
  way_cols            0
  sce             22764
  marks              18
  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 5981448 bytes 114572 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 343356456 bytes 227461 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 7585806 bytes 114577 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0