c2
--

+ ip tcp_metrics show
192.168.119.83 age 6.665sec cwnd 10 rtt 1887us rttvar 1663us source 192.168.115.51
10.4.0.67 age 71.834sec cwnd 16 rtt 2055us rttvar 2867us source 10.4.0.51
10.4.0.68 age 71.796sec cwnd 17 rtt 5546us rttvar 9380us source 10.4.0.51
10.4.0.51 age 71.978sec cwnd 10 rtt 3586us rttvar 5560us source 10.4.0.51
10.4.0.83 age 71.880sec cwnd 17 rtt 4583us rttvar 8374us source 10.4.0.51


s2
--

+ ip tcp_metrics show
10.4.0.51 age 71.969sec cwnd 3 rtt 1615us rttvar 2848us source 10.4.0.83
192.168.115.51 age 6.758sec cwnd 10 rtt 867us rttvar 546us 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 8155360 bytes 123208 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80e9: 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 8155360 bytes 123208 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 0us delay_l 0us
pkts_in_c 123208 pkts_in_l 0 maxq 0
ecn_mark 0 step_marks 0
credit -121120 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 371251074 bytes 248374 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 80e9: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 8155360 bytes 123208 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 123208 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 375025910 bytes 248375 pkt (dropped 0, overlimits 242193 requeues 0) 
 backlog 0b 0p requeues 0
qdisc dualpi2 80ea: 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 375025910 bytes 248375 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0
prob 0.000000 delay_c 1us delay_l 0us
pkts_in_c 707 pkts_in_l 241944 maxq 8
ecn_mark 95347 step_marks 95341
credit -3080 (L)

qdisc ingress ffff: parent ffff:fff1 ---------------- 
 Sent 6430584 bytes 123209 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 80ea: prio 0 quantum 200000 rate 50Mbit ceil 50Mbit linklayer ethernet burst 1600b/1 mpu 0b cburst 1600b/1 mpu 0b level 0 
 Sent 375025910 bytes 248375 pkt (dropped 0, overlimits 242193 requeues 0) 
 backlog 0b 0p requeues 0
 lended: 242651 borrowed: 0 giants: 0
 tokens: 3895 ctokens: 3895


+ tc -s -d qdisc show dev ifb4ens192
qdisc netem 1: root refcnt 2 limit 1000000
 Sent 375026308 bytes 248379 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 8155860 bytes 123214 pkt (dropped 0, overlimits 0 requeues 0) 
 backlog 0b 0p requeues 0