c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.254sec ssthresh 274 cwnd 137 rtt 82068us rttvar 66409us source 192.168.115.51
10.4.0.67 age 71.787sec cwnd 18 rtt 2251us rttvar 3099us source 10.4.0.51
10.4.0.68 age 71.768sec cwnd 14 rtt 3025us rttvar 4596us source 10.4.0.51
10.4.0.51 age 71.935sec cwnd 10 rtt 3659us rttvar 5627us source 10.4.0.51
10.4.0.83 age 71.833sec cwnd 17 rtt 4687us rttvar 8179us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.899sec cwnd 3 rtt 1601us rttvar 2856us source 10.4.0.83
192.168.115.51 age 6.283sec cwnd 10 rtt 82077us rttvar 66009us 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 3336276 bytes 50178 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f3: 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 3336276 bytes 50178 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 50178 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 176558036 bytes 120772 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 80f3: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 3336276 bytes 50178 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 50178 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 181834926 bytes 120771 pkt (dropped 0, overlimits 50975 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f4: 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 181834926 bytes 120771 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 706 pkts_in_l 51099 maxq 33
ecn_mark 1976 step_marks 1945
credit -4600 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 2633846 bytes 50177 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 80f4: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 181834926 bytes 120771 pkt (dropped 0, overlimits 50975 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 51805 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 181835426 bytes 120777 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 3336674 bytes 50182 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0