= Holding Bin for UDT Example Stuff =

== Steps ==

 1. Create slice in Flack
 1. Load rspec ''udt.rspec'' and submit for sliver creation. (Include a picture here.)
 1. Log into pc1 and pc2 in separate windows.
 1. On pc1, start a UDT file transfer server, using this command:
{{{
% pc1:~% /local/udt4/app/sendfile
server is ready at port: 9000
}}}
On pc2, start a UDT file transfer client, using this command:
{{{
pc2:~% /local/udt4/app/recvfile pc1 9000 /local/datafiles/sm.10M /dev/null
}}}
You should see output like the following in your pc1 window, showing the results of the file transfer. Note the transfer rate.
{{{
new connection: 192.168.2.2:55839
speed = 7.14472Mbits/sec
}}}
 1. There are three data files available for transfer tests: '''/local/datafiles/sm.10M''' is 10MB, '''/local/datafiles/med.100M''' is 100MB, and '''/local/datafiles/lg.1G''' is 1GB. Leave your transfer server running on pc1, and try transferring each of these files in turn by typing the appropriate commands on pc2. Keep track of the transfer rates in each case.
 1. Now let's compare the results to a TCP-based (FTP) transfer. On pc2, start an ftp client:
[[br]]
(You type ''ftp pc1'', the user name ''anonymous'', and any password you want, although your e-mail address is traditional.)
{{{
pc2:~% ftp pc1
Connected to PC1-lan1.
220 (vsFTPd 2.3.2)
Name (pc1:mberman): anonymous
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> 
}}}
Still on pc2, request a file transfer. Note the reported file size, transfer time, and transfer rate.
{{{
ftp> get med.100M
local: med.100M remote: med.100M
200 PORT command successful. Consider using PASV.
150 Opening BINARY mode data connection for med.100M (104857600 bytes).
226 Transfer complete.
104857600 bytes received in 1.75 secs (58508.9 kB/s)
}}}

== Experiment ==

Now try changing the characteristics of the link and measuring how they affect UDT and TCP performance. You will need to log into your delay node to change the link characteristics. Then, on your delay node, use this command:

{{{
%sudo ipfw pipe show
}}}

You'll get something like this:
{{{
60111:   4.000 Mbit/s    0 ms   50 sl. 1 queues (1 buckets) droptail
    mask: 0x00 0x00000000/0x0000 -> 0x00000000/0x0000
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
  0 udp          0.0.0.0/68    255.255.255.255/67    170991 230659480  0    0 149
60121:   4.000 Mbit/s    0 ms   50 sl. 1 queues (1 buckets) droptail
    mask: 0x00 0x00000000/0x0000 -> 0x00000000/0x0000
BKT Prot ___Source IP/port____ ____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp
  0 ip   207.167.231.176/0       195.123.192.8/6     20538  1663157  0    0   0
}}}

To change bandwidth:
{{{
sudo ipfw pipe 60111 config bw 100M
sudo ipfw pipe 60121 config bw 100M
}}}