c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.430sec cwnd 8 rtt 4295us rttvar 6166us source 10.4.0.50
10.4.0.66 age 0.179sec source 10.4.0.50
192.168.119.82 age 11.170sec ssthresh 9 cwnd 10 rtt 2258us rttvar 1495us source 192.168.115.50
10.4.0.50 age 76.681sec cwnd 10 rtt 4411us rttvar 5973us source 10.4.0.50
10.4.0.82 age 0.181sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.831sec cwnd 10 rtt 1705us rttvar 3018us source 10.4.0.82
192.168.115.50 age 11.223sec cwnd 10 rtt 906us rttvar 556us 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 9172760 bytes 138264 pkt (dropped 0, overlimits 50 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          2us
  av_delay          1us
  sp_delay          1us
  backlog            0b
  pkts           138264
  bytes         9172760
  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 365889142 bytes 249219 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 375300190 bytes 249219 pkt (dropped 0, overlimits 382894 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 101528b 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        2.7ms
  av_delay        1.5ms
  sp_delay          1us
  backlog            0b
  pkts           249219
  bytes       375300190
  way_inds            0
  way_miss            6
  way_cols            0
  sce            125700
  marks             613
  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 7237154 bytes 138264 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
 Sent 375300630 bytes 249224 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
 Sent 9173200 bytes 138269 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0