c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.443sec ssthresh 142 cwnd 142 rtt 90391us rttvar 46047us source 192.168.115.51
10.4.0.67 age 72.092sec cwnd 18 rtt 2028us rttvar 2815us source 10.4.0.51
10.4.0.68 age 72.060sec cwnd 14 rtt 4275us rttvar 6566us source 10.4.0.51
10.4.0.51 age 72.232sec cwnd 10 rtt 3600us rttvar 5563us source 10.4.0.51
10.4.0.83 age 72.128sec cwnd 12 rtt 2796us rttvar 3773us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.210sec cwnd 10 rtt 1618us rttvar 2850us source 10.4.0.83
192.168.115.51 age 6.484sec cwnd 10 rtt 81347us rttvar 46212us 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 7001258 bytes 105359 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 810b: 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 7001258 bytes 105359 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 104659 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 313337324 bytes 211842 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 810b: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 7001258 bytes 105359 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 105359 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 318711774 bytes 211843 pkt (dropped 0, overlimits 152464 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 810c: 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 318711774 bytes 211843 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 47213 pkts_in_l 118309 maxq 38
ecn_mark 1856 step_marks 33
credit -165220 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 5526350 bytes 105360 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 810c: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 318711774 bytes 211843 pkt (dropped 0, overlimits 152464 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 165522 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 318712154 bytes 211847 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 7001740 bytes 105365 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0