c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.692sec cwnd 10 reordering 12 rtt 2250us rttvar 2110us source 192.168.115.51
10.4.0.67 age 70.875sec cwnd 14 rtt 4628us rttvar 8107us source 10.4.0.51
10.4.0.68 age 70.827sec cwnd 17 rtt 3501us rttvar 6792us source 10.4.0.51
10.4.0.51 age 70.980sec cwnd 10 rtt 3618us rttvar 5576us source 10.4.0.51
10.4.0.83 age 70.876sec cwnd 17 rtt 4698us rttvar 8567us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 70.951sec cwnd 3 rtt 1656us rttvar 2862us source 10.4.0.83
192.168.115.51 age 5.769sec cwnd 10 rtt 1023us rttvar 598us 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 4347472 bytes 65414 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80e7: 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 4347472 bytes 65414 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 65414 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 362447956 bytes 248385 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 80e7: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 4347472 bytes 65414 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 65414 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 375044036 bytes 248386 pkt (dropped 0, overlimits 72448 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80e8: 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 375044036 bytes 248386 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 72320 maxq 5
ecn_mark 44420 step_marks 44369
credit 18380 (C)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 3431794 bytes 65415 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 80e8: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375044036 bytes 248386 pkt (dropped 0, overlimits 72448 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 73026 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375044416 bytes 248390 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 4347954 bytes 65420 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0