c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.780sec ssthresh 39 cwnd 27 rtt 15808us rttvar 8173us source 192.168.115.51
10.4.0.67 age 72.077sec cwnd 14 rtt 4640us rttvar 8128us source 10.4.0.51
10.4.0.68 age 72.017sec cwnd 17 rtt 3753us rttvar 5788us source 10.4.0.51
10.4.0.51 age 72.173sec cwnd 10 rtt 3380us rttvar 5351us source 10.4.0.51
10.4.0.83 age 72.068sec cwnd 16 rtt 4066us rttvar 5561us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.168sec cwnd 10 rtt 1592us rttvar 2850us source 10.4.0.83
192.168.115.51 age 6.872sec cwnd 10 rtt 11550us rttvar 6534us 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 8203718 bytes 123575 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8103: 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 8203718 bytes 123575 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 122875 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 369308638 bytes 248936 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 8103: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 8203718 bytes 123575 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 123575 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 374871392 bytes 248932 pkt (dropped 3, overlimits 207521 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8104: 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 374871392 bytes 248932 pkt (dropped 3, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 39208 pkts_in_l 169764 maxq 24
ecn_mark 17244 step_marks 6607
credit -132700 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6473712 bytes 123574 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 8104: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 374871392 bytes 248932 pkt (dropped 0, overlimits 207521 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 208969 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000 delay 5.0ms
 Sent 374872168 bytes 248941 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 5.0ms
 Sent 8204098 bytes 123579 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0