Welcome to the Ubuntu-Arizona LoCo Team Website. We are an “Approved” Ubuntu Local Community Team, and a volunteer organization within the State of Arizona that is committed to Ubuntu advocacy and education. Our goal is to increase the public awareness and use of Ubuntu and Open Source Software in our state. Working with the state Linux User Groups to pool our resource and expand our out reach is essential to meeting our goals. We follow the Ubuntu Code of Conduct. Membership: Join our Team!

AZLOCO Meeting Date Changes

Effective 17 February, the Ubuntu Arizona Local Community Team (AZLOCO) will only hold on line meetings on the 1st and 3rd Sundays of each month. The time, 9:00-9:30 pm, and of course the IRC channel, #ubuntu-us-az on freenode.net, will remain the same. This change is the result of several factors, the low attendance at the on line meetings and the apparent repetitive release of information. The meeting notes will continue to be sent to those members who have subscribed to the AZLOCO mailing list.

gigabit switch test

I setup a gigabit switch and wanted to check the transfer rate between 2 linux systems.

1) Using iperf
==============
install iperf on both server and client, sudo apt install iperf

on server: iperf -s
on client: iperf -c server_host
————————————————————
Client connecting to server_host, TCP port 5001
TCP window size: 85.0 KByte (default)
————————————————————
[ 3] local 10.0.0.44 port 36798 connected with 10.0.0.30 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec

2) Using nc
===========
nothing to install, nc is already installed.

on server: nc -vvlnp 12345 >/dev/null
on client: dd if=/dev/zero bs=1M count=1K | nc -vv server_host 12345

Connection to server_host 12345 port [tcp/*] succeeded!
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 9.16265 s, 117 MB/s

iperf reports 939 Mbits/sec, about same as 117 MB/s (divide 939 / 8 bits/byte)

END