c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.507sec cwnd 10 rtt 3882us rttvar 5240us source 10.4.0.50
10.4.0.66 age 0.215sec source 10.4.0.50
192.168.119.82 age 10.349sec ssthresh 137 cwnd 127 rtt 82964us rttvar 44588us source 192.168.115.50
10.4.0.50 age 76.681sec cwnd 10 rtt 4752us rttvar 6385us source 10.4.0.50
10.4.0.82 age 0.215sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.804sec cwnd 10 rtt 1697us rttvar 3002us source 10.4.0.82
192.168.115.50 age 10.292sec cwnd 10 rtt 81419us rttvar 46588us 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 8127914 bytes 122433 pkt (dropped 0, overlimits 145 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          5us
  av_delay          2us
  sp_delay          1us
  backlog            0b
  pkts           122433
  bytes         8127914
  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 348751334 bytes 237969 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 358267690 bytes 237969 pkt (dropped 0, overlimits 324532 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 424584b 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        411us
  av_delay        134us
  sp_delay          2us
  backlog            0b
  pkts           237969
  bytes       358267690
  way_inds            0
  way_miss            6
  way_cols            0
  sce             28468
  marks              41
  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 6413942 bytes 122433 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 358268130 bytes 237974 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 8128354 bytes 122438 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0