iftop -i eth1 -F iptraf slurm dnstop # show DNS traffic darkstat bandwidthd iperf Bandwidth -------------------------------------------------------------------------------- Server: iperf3 -s -p 5555 Client - upload to server iperf3 -c -p 5555 Client - download from server iperf3 -R -c -p 5555 Traffic shaping: -------------------------------------------------------------------------------- Outbound Interface!! first remove everything from the queque # tc qdisc del root dev eth0 # tc qdisc add dev eth0 root handle 1:0 htb default 10 r2q 6 # tc class add dev eth0 parent 1:0 classid 1:1 htb rate 10mbit ceil 10mbit # tc class add dev eth0 parent 1:1 classid 1:10 htb rate 10mbit ceil 10mbit prio 0 Degrading: ________________________________________________________________________________ Network Delay # tc qdisc add dev eth0 root netem delay 100ms Random Network Delay # tc qdisc change dev eth0 root netem delay 100ms 10ms Packet Loss # tc qdisc change dev eth0 root netem loss 0.1% # tc qdisc change dev eth0 root netem loss 0.3% 25% Check MTU -------------------------------------------------------------------------------- ping -M do -s 1460 8.8.8.8 iperf -c 10.1.9.36 -s 1460