c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.760sec ssthresh 17 cwnd 20 rtt 16653us rttvar 9123us source 192.168.115.51
10.4.0.67 age 72.061sec cwnd 17 rtt 4821us rttvar 8011us source 10.4.0.51
10.4.0.68 age 72.019sec cwnd 14 rtt 3203us rttvar 6154us source 10.4.0.51
10.4.0.51 age 72.131sec cwnd 10 rtt 1740us rttvar 2794us source 10.4.0.51
10.4.0.83 age 72.056sec cwnd 17 rtt 5077us rttvar 7395us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.157sec cwnd 10 rtt 1671us rttvar 2956us source 10.4.0.83
192.168.115.51 age 6.860sec cwnd 10 rtt 15272us rttvar 9992us source 192.168.119.83


m2
--

+ 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


m3
--

+ tc -s -d qdisc show dev ens192
qdisc htb 1: root refcnt 2 r2q 10 default 0x1 direct_packets_stat 0 ver 3.17 direct_qlen 1000
 Sent 6895146 bytes 103735 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f7: parent 1:1 limit 10000p target 15.0ms tupdate 16.0ms alpha 0.156250 beta 3.195312 l4s_ect coupling_factor 2 drop_on_overload step_thresh 1.0ms drop_dequeue classic_protection 10% 
 Sent 6895146 bytes 103735 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 103035 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 365007764 bytes 249606 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d class show dev ens192
class htb 1:1 root leaf 80f7: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 6895146 bytes 103735 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 103735 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ens224
qdisc htb 1: root refcnt 2 r2q 10 default 0x1 direct_packets_stat 0 ver 3.17 direct_qlen 1000
 Sent 375887230 bytes 249603 pkt (dropped 4, overlimits 106805 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f8: parent 1:1 limit 10000p target 15.0ms tupdate 16.0ms alpha 0.156250 beta 3.195312 l4s_ect coupling_factor 2 drop_on_overload step_thresh 1.0ms drop_dequeue classic_protection 10% 
 Sent 375887230 bytes 249603 pkt (dropped 4, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 106880 pkts_in_l 700 maxq 54
ecn_mark 371 step_marks 0
credit -77180 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5442974 bytes 103736 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0

+ tc -s -d class show dev ens224
class htb 1:1 root leaf 80f8: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375887230 bytes 249603 pkt (dropped 0, overlimits 106805 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 107576 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375888002 bytes 249611 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 6895628 bytes 103741 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0