c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.836sec ssthresh 6 cwnd 10 rtt 1461us rttvar 916us source 192.168.115.51
10.4.0.67 age 72.024sec cwnd 18 rtt 2202us rttvar 3122us source 10.4.0.51
10.4.0.68 age 72.024sec ssthresh 17 cwnd 8 rtt 4245us rttvar 6623us source 10.4.0.51
10.4.0.51 age 72.165sec cwnd 10 rtt 3655us rttvar 5631us source 10.4.0.51
10.4.0.83 age 72.021sec cwnd 17 rtt 1952us rttvar 3431us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.112sec cwnd 3 rtt 1621us rttvar 2885us source 10.4.0.83
192.168.115.51 age 6.929sec cwnd 10 rtt 969us rttvar 705us 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 8178366 bytes 123197 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80fb: 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 8178366 bytes 123197 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 122497 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 370798660 bytes 249236 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 80fb: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 8178366 bytes 123197 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 123197 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 375326088 bytes 249224 pkt (dropped 13, overlimits 228482 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80fc: 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 375326088 bytes 249224 pkt (dropped 13, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 15698 pkts_in_l 213550 maxq 29
ecn_mark 100994 step_marks 39395
credit -16540 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6453726 bytes 123198 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 80fc: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375326088 bytes 249224 pkt (dropped 0, overlimits 228482 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 229235 borrowed: 0 giants: 0
 tokens: 3895 ctokens: 3895


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375327742 bytes 249241 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
 Sent 8178848 bytes 123203 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0