c1
--

+ ip tcp_metrics show
10.4.0.67 age 77.661sec cwnd 10 rtt 4227us rttvar 6177us source 10.4.0.50
10.4.0.66 age 0.046sec cwnd 14 rtt 3585us rttvar 5584us source 10.4.0.50
192.168.119.82 age 12.278sec ssthresh 5 cwnd 17 rtt 14809us rttvar 9716us source 192.168.115.50
10.4.0.50 age 77.829sec cwnd 10 rtt 1940us rttvar 3014us source 10.4.0.50
10.4.0.82 age 0.321sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 77.838sec cwnd 10 rtt 1727us rttvar 3053us source 10.4.0.82
192.168.115.50 age 12.148sec cwnd 10 rtt 11185us rttvar 6394us 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 9499106 bytes 143209 pkt (dropped 0, overlimits 391 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          3us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           143209
  bytes         9499106
  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 364760796 bytes 248855 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 374747538 bytes 248853 pkt (dropped 0, overlimits 370604 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 89432b 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        3.7ms
  av_delay        3.1ms
  sp_delay          2us
  backlog            0b
  pkts           248853
  bytes       374747538
  way_inds            0
  way_miss            6
  way_cols            0
  sce            127976
  marks              93
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len         12112
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 7494196 bytes 143207 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 374748080 bytes 248860 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 9499444 bytes 143212 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0