c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.678sec ssthresh 6 cwnd 92 rtt 83841us rttvar 45559us source 192.168.115.51
10.4.0.67 age 72.029sec cwnd 17 rtt 5378us rttvar 9222us source 10.4.0.51
10.4.0.68 age 71.982sec cwnd 17 rtt 4842us rttvar 7730us source 10.4.0.51
10.4.0.51 age 72.130sec cwnd 10 rtt 3624us rttvar 5574us source 10.4.0.51
10.4.0.83 age 72.026sec cwnd 17 rtt 5128us rttvar 7195us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.159sec cwnd 10 rtt 1620us rttvar 2887us source 10.4.0.83
192.168.115.51 age 5.771sec cwnd 10 rtt 84020us rttvar 47577us 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 4281740 bytes 64134 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8109: 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 4281740 bytes 64134 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 63434 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 347776346 bytes 239105 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 8109: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 4281740 bytes 64134 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 64134 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 359987594 bytes 239105 pkt (dropped 0, overlimits 67574 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 810a: 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 359987594 bytes 239105 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 4us
pkts_in_c 64202 pkts_in_l 4444 maxq 37
ecn_mark 105 step_marks 72
credit -151640 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 3383982 bytes 64135 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 810a: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 359987594 bytes 239105 pkt (dropped 0, overlimits 67574 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 68646 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 359988034 bytes 239110 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 4282222 bytes 64140 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0