c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.600sec ssthresh 24 cwnd 13 rtt 11397us rttvar 8977us source 192.168.115.51
10.4.0.67 age 70.837sec cwnd 17 rtt 5168us rttvar 7232us source 10.4.0.51
10.4.0.68 age 70.799sec cwnd 17 rtt 4833us rttvar 7468us source 10.4.0.51
10.4.0.51 age 70.948sec cwnd 10 rtt 3011us rttvar 4811us source 10.4.0.51
10.4.0.83 age 70.841sec cwnd 17 rtt 3637us rttvar 6912us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 70.940sec cwnd 3 rtt 1622us rttvar 2872us source 10.4.0.83
192.168.115.51 age 5.698sec cwnd 10 rtt 10851us rttvar 8713us 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 3867454 bytes 58203 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80eb: 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 3867454 bytes 58203 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 58203 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 292521330 bytes 200544 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 80eb: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 3867454 bytes 58203 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 58203 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 302611290 bytes 200545 pkt (dropped 0, overlimits 59790 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80ec: 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 302611290 bytes 200545 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 708 pkts_in_l 59791 maxq 4
ecn_mark 400 step_marks 397
credit 41920 (C)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 3052748 bytes 58204 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 80ec: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 302611290 bytes 200545 pkt (dropped 0, overlimits 59790 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 60499 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 302611688 bytes 200549 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 3867954 bytes 58209 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0