c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.624sec cwnd 23 rtt 11903us rttvar 9905us source 192.168.115.51
10.4.0.67 age 71.899sec cwnd 18 rtt 3691us rttvar 5234us source 10.4.0.51
10.4.0.68 age 71.793sec cwnd 17 rtt 3797us rttvar 6231us source 10.4.0.51
10.4.0.51 age 72.002sec cwnd 10 rtt 3639us rttvar 5575us source 10.4.0.51
10.4.0.83 age 71.901sec cwnd 17 rtt 5291us rttvar 9219us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.992sec cwnd 3 rtt 1585us rttvar 2835us source 10.4.0.83
192.168.115.51 age 6.712sec cwnd 10 rtt 10852us rttvar 8733us 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 8101324 bytes 122390 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80ef: 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 8101324 bytes 122390 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 122390 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 369149876 bytes 246942 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 80ef: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 8101324 bytes 122390 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 122390 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 372856306 bytes 246941 pkt (dropped 0, overlimits 238669 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f0: 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 372856306 bytes 246941 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 706 pkts_in_l 241439 maxq 11
ecn_mark 39579 step_marks 39572
credit -2820 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6387926 bytes 122389 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 80f0: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 372856306 bytes 246941 pkt (dropped 0, overlimits 238669 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 242145 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 372856806 bytes 246947 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 8101722 bytes 122394 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0