c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.140sec ssthresh 18 cwnd 11 rtt 82321us rttvar 66948us source 192.168.115.51
10.4.0.67 age 71.818sec cwnd 18 rtt 3664us rttvar 6910us source 10.4.0.51
10.4.0.68 age 71.771sec cwnd 17 rtt 4768us rttvar 7654us source 10.4.0.51
10.4.0.51 age 71.910sec cwnd 10 rtt 3008us rttvar 4728us source 10.4.0.51
10.4.0.83 age 71.811sec cwnd 17 rtt 4992us rttvar 7484us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.928sec cwnd 10 rtt 1603us rttvar 2858us source 10.4.0.83
192.168.115.51 age 6.217sec cwnd 10 rtt 81883us rttvar 65434us 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 399982 bytes 5697 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f1: 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 399982 bytes 5697 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 5697 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 15397802 bytes 11112 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 80f1: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 399982 bytes 5697 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 5697 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 15811158 bytes 11111 pkt (dropped 0, overlimits 5351 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80f2: 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 15811158 bytes 11111 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 5445 maxq 4
ecn_mark 98 step_marks 98
credit -1180 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 320268 bytes 5696 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 80f2: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 15811158 bytes 11111 pkt (dropped 0, overlimits 5351 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 6151 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 15811640 bytes 11117 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 400362 bytes 5701 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0