c1
--

+ ip tcp_metrics show
10.4.0.67 age 76.465sec cwnd 10 rtt 5562us rttvar 8212us source 10.4.0.50
10.4.0.66 age 0.174sec source 10.4.0.50
192.168.119.82 age 11.201sec ssthresh 11 cwnd 10 rtt 4707us rttvar 4795us source 192.168.115.50
10.4.0.50 age 76.710sec cwnd 10 rtt 4406us rttvar 6015us source 10.4.0.50
10.4.0.82 age 0.176sec source 10.4.0.50


s1
--

+ ip tcp_metrics show
10.4.0.50 age 76.810sec cwnd 10 rtt 1719us rttvar 3056us source 10.4.0.82
192.168.115.50 age 11.213sec cwnd 10 rtt 941us rttvar 597us 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 9285356 bytes 139970 pkt (dropped 0, overlimits 82 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         19us
  av_delay          2us
  sp_delay          1us
  backlog            0b
  pkts           139970
  bytes         9285356
  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 365296934 bytes 249223 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 375306246 bytes 249223 pkt (dropped 0, overlimits 371427 requeues 0) 
 backlog 0b 0p requeues 0
 memory used: 108000b 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        3.3ms
  sp_delay          1us
  backlog            0b
  pkts           249223
  bytes       375306246
  way_inds            0
  way_miss            6
  way_cols            0
  sce            209237
  marks            1170
  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 7325866 bytes 139970 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 375306686 bytes 249228 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 9285796 bytes 139975 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0