c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.668sec ssthresh 5 cwnd 10 rtt 1502us rttvar 1124us source 192.168.115.51
10.4.0.67 age 70.854sec cwnd 17 rtt 5247us rttvar 9116us source 10.4.0.51
10.4.0.68 age 70.794sec cwnd 14 rtt 2971us rttvar 4382us source 10.4.0.51
10.4.0.51 age 70.940sec cwnd 10 rtt 3018us rttvar 4833us source 10.4.0.51
10.4.0.83 age 70.846sec cwnd 16 rtt 4644us rttvar 8179us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 70.940sec cwnd 3 rtt 1624us rttvar 2876us source 10.4.0.83
192.168.115.51 age 5.764sec cwnd 10 rtt 924us rttvar 511us 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 6547024 bytes 98768 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80e5: 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 6547024 bytes 98768 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 98768 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 364218308 bytes 247974 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 80e5: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 6547024 bytes 98768 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 98768 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 374421782 bytes 247975 pkt (dropped 0, overlimits 118091 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80e6: 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 374421782 bytes 247975 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 707 pkts_in_l 117809 maxq 4
ecn_mark 7855 step_marks 7809
credit 20600 (C)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5164390 bytes 98769 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 80e6: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 374421782 bytes 247975 pkt (dropped 0, overlimits 118091 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 118516 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 374422162 bytes 247979 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 6547506 bytes 98774 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0