c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.829sec ssthresh 5 cwnd 14 rtt 11352us rttvar 6087us source 192.168.115.51
10.4.0.67 age 71.148sec cwnd 15 rtt 4611us rttvar 6327us source 10.4.0.51
10.4.0.68 age 71.091sec cwnd 17 rtt 3477us rttvar 5153us source 10.4.0.51
10.4.0.51 age 71.246sec cwnd 10 rtt 3654us rttvar 5654us source 10.4.0.51
10.4.0.83 age 71.144sec cwnd 17 rtt 5269us rttvar 9211us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.196sec cwnd 3 rtt 1620us rttvar 2870us source 10.4.0.83
192.168.115.51 age 5.879sec cwnd 10 rtt 11120us rttvar 6375us 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 7999736 bytes 120490 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8105: 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 7999736 bytes 120490 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 119790 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 367027578 bytes 246489 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 8105: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 7999736 bytes 120490 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 120490 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 371166928 bytes 246488 pkt (dropped 0, overlimits 228526 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8106: 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 371166928 bytes 246488 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 719 pkts_in_l 232526 maxq 14
ecn_mark 35593 step_marks 35572
credit -1020 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6312920 bytes 120489 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 8106: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 371166928 bytes 246488 pkt (dropped 0, overlimits 228526 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 233245 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 371167410 bytes 246494 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 8000116 bytes 120494 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0