playing with TOS vs. DiffServ bits
Re-compile your kernel for enabling the ALTQ options.
Evaluate maximum bandwidth by means of physical device capability
dmesg | grep ^vioif dmesg | grep ^xennet
and against some network path (another network vs public) to take intermediate hops into account including modems
By means of FTP (choose your closest mirror)
export PKG_PATH=ftp://ftp.ee.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/8.0/All/ #export PKG_PATH=ftp://ftp.fr.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/8.0/All/ export PASSIVE_FTP=yes ftp -a $PKG_PATH bye
By means of iPerf
pkg_add -v iperf3 pkg_info | grep iperf3
sysctl -w net.inet.ip.forwarding=1 sysctl -w net.inet6.ip6.forwarding=1 sysctl -w net.inet.tcp.ecn.enable=1 cat >> /etc/sysctl.conf <<-EOF net.inet.ip.forwarding=1 net.inet6.ip6.forwarding=1 net.inet.tcp.ecn.enable=1 EOF
Start with a very low overall bandwidth just for testing.
Here PRIQ for simplicity.
ICMP and UDP priority, from 0 to 15, the latter being the highest priority.
Choose your protocol number carefully.
vi /etc/altq.conf # new file interface xennet0 bandwidth xxxK priq class priq xennet0 classicmp NULL priority 14 class priq xennet0 classudp NULL priority 13 class priq xennet0 classlow NULL priority 0 default filter xennet0 classicmp 0 0 0 0 1 filter xennet0 classudp 0 0 0 0 0 17 interface xennet1 bandwidth xxxK priq class priq xennet1 classicmp NULL priority 14 class priq xennet1 classudp NULL priority 13 class priq xennet1 classlow NULL priority 0 default filter xennet1 classicmp 0 0 0 0 1 filter xennet1 classudp 0 0 0 0 17
Now if you tag the packets from another router or yourself, using a conditioner, eventually get rid of the protocol number (write 0 instead) and add the tos keyword and value to further classify your network stream.
Beware about ToS vs. DiffServ.
ICMP -- 1 TCP -- 6 UDP -- 17 tos -- 0x10 tos -- 0x60 tos -- 0x
The manual says that class name must be unique per interface, this means we can use same name for differents interfaces.
echo altqd=yes >> /etc/rc.conf /etc/rc.d/altqd start
ALTQ provides some statistics by itself
altqstat -i xennet0 altqstat -i xennet1
TCP first
iperf3 --time 0 -c x.x.x.x
meanwhile UDP
iperf3 --time 0 -u -c x.x.x.x -p 5202
then ICMP
ping -f x.x.x.x
You might need to change the UDP bandwidth manually, see the iperf3 manual. Also notice there are two more columns with the UDP output of iperf3.
Sniff
tcpdump -i NETIF host ENDPOINT -vvv
Alternatives to iPerf3
pkgsrc -- net/netperf pkgsrc -- net/aria2
QoS https://nethence.com/lectures/network07-qos.slides.pdf
QoS Resources https://nethence.com/lectures/network07-qos.resources.pdf
Public iPerf3 servers https://iperf.fr/iperf-servers.php
Public Iperf3 servers https://iperf.cc/
Protocol Numbers https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml
altqd traffic shaping example https://wiki.netbsd.org/tutorials/altqd_traffic_shaping_example/
altq.conf – ALTQ configuration file https://man.netbsd.org/altq.conf.5
ALTQ: Alternate Queueing for BSD UNIX (version 3.1) https://www.iijlab.net/~kjc/software/ https://www2.sonycsl.co.jp/person/kjc/kjc/software.html
ALTQ Tips https://www.iijlab.net/~kjc/software/TIPS.txt https://www2.sonycsl.co.jp/person/kjc/software/TIPS.txt
(deprecated –> NPF) https://www.netbsd.org/docs/network/pf.html#altq
src/usr.sbin/altq/altqd/altq.conf.samples/ http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.sbin/altq/altqd/altq.conf.samples/?only_with_tag=MAIN
ping – send ICMP ECHO_REQUEST packets to network hosts https://man.netbsd.org/ping.8 –> Flood
Change between iPerf 2.0, iPerf 3.0 and iPerf 3.1 https://iperf.fr/iperf-doc.php#3change –> Setting DSCP/TOS bit vectors (-S)
iPerf 3 user documentation https://iperf.fr/iperf-doc.php#3doc –> -S, –tos n
benchmarks/netperf - The NetBSD Packages Collection http://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/benchmarks/netperf/README.html
net/aria2 - The NetBSD Packages Collection http://ftp.netbsd.org/pub/pkgsrc/current/pkgsrc/net/aria2/README.html
List of IP protocol numbers https://en.wikipedia.org/wiki/List_of_IP_protocol_numbers