c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.828sec ssthresh 30 cwnd 20 rtt 13116us rttvar 13710us source 192.168.115.51
10.4.0.67 age 72.136sec cwnd 15 rtt 4082us rttvar 5630us source 10.4.0.51
10.4.0.68 age 72.053sec cwnd 16 rtt 4359us rttvar 7055us source 10.4.0.51
10.4.0.51 age 72.244sec cwnd 10 rtt 3658us rttvar 5648us source 10.4.0.51
10.4.0.83 age 72.137sec cwnd 17 rtt 5270us rttvar 9149us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.209sec cwnd 3 rtt 1607us rttvar 2835us source 10.4.0.83
192.168.115.51 age 6.904sec cwnd 10 rtt 12059us rttvar 14280us 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 7380744 bytes 111098 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f9: 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 7380744 bytes 111098 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 110398 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 365242600 bytes 249456 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 80f9: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 7380744 bytes 111098 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 111098 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 375660424 bytes 249456 pkt (dropped 1, overlimits 115701 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80fa: 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 375660424 bytes 249456 pkt (dropped 1, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 62997 pkts_in_l 53276 maxq 39
ecn_mark 6206 step_marks 528
credit -265660 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5825490 bytes 111099 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 80fa: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375660424 bytes 249456 pkt (dropped 0, overlimits 115701 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 116272 borrowed: 0 giants: 0
 tokens: 3755 ctokens: 3755


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375660902 bytes 249461 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 7381226 bytes 111104 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0