c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.628sec ssthresh 5 cwnd 26 rtt 21939us rttvar 14726us source 192.168.115.51
10.4.0.67 age 72.059sec cwnd 18 rtt 2249us rttvar 3153us source 10.4.0.51
10.4.0.68 age 72.044sec cwnd 16 rtt 4222us rttvar 6708us source 10.4.0.51
10.4.0.51 age 72.206sec cwnd 10 rtt 3045us rttvar 4814us source 10.4.0.51
10.4.0.83 age 72.100sec cwnd 17 rtt 3571us rttvar 5138us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 72.184sec cwnd 10 rtt 1603us rttvar 2853us source 10.4.0.83
192.168.115.51 age 6.706sec cwnd 10 rtt 20710us rttvar 9470us 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 4496720 bytes 67380 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8101: 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 4496720 bytes 67380 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 66680 pkts_in_l 700 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 362861272 bytes 249351 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 8101: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 4496720 bytes 67380 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 67380 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 375498524 bytes 249350 pkt (dropped 0, overlimits 72372 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 8102: 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 375498524 bytes 249350 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 1us
pkts_in_c 61569 pkts_in_l 11887 maxq 26
ecn_mark 974 step_marks 465
credit 15980 (C)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 3553462 bytes 67379 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 8102: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375498524 bytes 249350 pkt (dropped 0, overlimits 72372 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 73456 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 375499024 bytes 249356 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 4497118 bytes 67384 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0