c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.210sec cwnd 10 rtt 4309us rttvar 6095us source 10.4.0.50
10.4.0.66 age 0.017sec cwnd 17 rtt 3637us rttvar 5782us source 10.4.0.50
192.168.119.82 age 10.965sec ssthresh 49 cwnd 26 rtt 12477us rttvar 10336us source 192.168.115.50
10.4.0.50 age 76.389sec cwnd 10 rtt 1977us rttvar 3011us source 10.4.0.50
10.4.0.82 age 0.277sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.434sec cwnd 10 rtt 1662us rttvar 2989us source 10.4.0.82
192.168.115.50 age 10.881sec cwnd 10 rtt 11301us rttvar 8854us 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 8225696 bytes 124274 pkt (dropped 0, overlimits 202 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          4us
  av_delay          2us
  sp_delay          1us
  backlog            0b
  pkts           124274
  bytes         8225696
  way_inds            0
  way_miss            5
  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 364066306 bytes 247780 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 374126510 bytes 247779 pkt (dropped 0, overlimits 366787 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 67800b 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        1.7ms
  av_delay        1.6ms
  sp_delay          2us
  backlog            0b
  pkts           247779
  bytes       374126510
  way_inds            0
  way_miss            4
  way_cols            0
  sce            123586
  marks              91
  drops               0
  ack_drop            0
  sp_flows            0
  bk_flows            1
  un_flows            0
  max_len          7570
  quantum          1514

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6485848 bytes 124272 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 374126992 bytes 247785 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 8226006 bytes 124277 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0