c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.294sec ssthresh 323 cwnd 162 rtt 82708us rttvar 66723us source 192.168.115.51
10.4.0.67 age 71.826sec cwnd 17 rtt 5162us rttvar 7089us source 10.4.0.51
10.4.0.68 age 71.773sec cwnd 17 rtt 4894us rttvar 7581us source 10.4.0.51
10.4.0.51 age 71.938sec cwnd 10 rtt 3641us rttvar 5668us source 10.4.0.51
10.4.0.83 age 71.830sec cwnd 17 rtt 5016us rttvar 7368us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.957sec cwnd 10 rtt 1639us rttvar 2895us source 10.4.0.83
192.168.115.51 age 6.380sec cwnd 10 rtt 82280us rttvar 65608us 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 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 7783496 bytes 117574 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f5: 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 7783496 bytes 117574 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 117574 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 352417798 bytes 235760 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 80f5: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 7783496 bytes 117574 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 117574 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 355928230 bytes 235759 pkt (dropped 0, overlimits 216057 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f6: 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 355928230 bytes 235759 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 705 pkts_in_l 231017 maxq 90
ecn_mark 7741 step_marks 7726
credit 980 (C)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6137448 bytes 117572 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 80f6: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 355928230 bytes 235759 pkt (dropped 0, overlimits 216057 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 231722 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000 delay 40.0ms
 Sent 355928712 bytes 235765 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 40.0ms
 Sent 7783806 bytes 117577 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0