c2
--

+ ip tcp_metrics show
192.168.119.83 age 5.986sec ssthresh 119 cwnd 137 rtt 88820us rttvar 49972us source 192.168.115.51
10.4.0.67 age 72.066sec cwnd 14 rtt 4655us rttvar 6130us source 10.4.0.51
10.4.0.68 age 71.988sec cwnd 14 rtt 4405us rttvar 6966us source 10.4.0.51
10.4.0.51 age 72.178sec cwnd 10 rtt 3621us rttvar 5618us source 10.4.0.51
10.4.0.83 age 72.061sec cwnd 17 rtt 5172us rttvar 7106us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.147sec cwnd 10 rtt 1629us rttvar 2868us source 10.4.0.83
192.168.115.51 age 6.032sec cwnd 10 rtt 81952us rttvar 47310us 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 7209846 bytes 108509 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8107: 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 7209846 bytes 108509 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 107809 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 353318558 bytes 241328 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 8107: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 7209846 bytes 108509 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 108509 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 363353118 bytes 241327 pkt (dropped 1, overlimits 112313 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8108: 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 363353118 bytes 241327 pkt (dropped 1, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 112625 pkts_in_l 700 maxq 91
ecn_mark 42 step_marks 0
credit -164400 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5690810 bytes 108509 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 8108: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 363353118 bytes 241327 pkt (dropped 0, overlimits 112313 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 113324 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 363353656 bytes 241333 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 7210286 bytes 108514 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0