A question about net.addLink()

[intrig-unicamp]

A question about net.addLink()

[ramonfontes]

Hello, Please clone mininet-wifi again and run make install in order to compile the code with the changes. Then try something like *net.addLink(sta1, ap1, bw=10, loss=10, delay='15ms').* Please note that it won't work in scenarios with mobility. 2017-03-06 9:55 GMT-03:00 Ericzhang1127 <[email protected]>:

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Hello! I want to change the bandwidth, error rate, and delay between a station and an accesss piont . For examples,net.addLink(sta1, ap1,bw='11Mbps', loss='100%', delay='15ms') and net.addLink(sta2, ap1,bw='11Mbps', loss='100%', delay='15ms'). However,when I input "sta1 ping sta2" in the CLI, it shows that "6 packets transmitted, 6 received, 0% packet loss". I set the loss="100%" and why the packet loss is 0%? It also shows that “64 bytes from 192.168.0.4: icmp_seq=4 ttl=64 time=0.069 ms”.The delay='15ms' doesn't work at all. Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#53>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmetAmD0A7rTBoFfpAp-ZcZchQiUz1ks5rjAJHgaJpZM4MUHR0> .

[Ericzhang1127]

Thank you！

[hdm0511]

Hi Ramonfontes,
I create a network in mininet wifi (code below) with a given fixed bandwidth (100Mbps), link delay and packet loss. However when i ping from host to host the packet loss results are different from time to time.
For instance:
net.addLink(s2, h3, bw=1000)
net.addLink(s2, h8, bw=100, delay='25ms', loss=2)
packet loss of the command: h8 ping -c 100 h3. the packet loss should be 2. but the actual results are not consistent ( 4, 5, 7...)
I dont know how to keep the packet loss to a given number.

Thank you,

`from mn_wifi.net import Mininet_wifi
from mn_wifi.cli import CLI_wifi
from mininet.node import Controller
from mininet.log import setLogLevel, info

def topology():

"Create a network."
net = Mininet_wifi( controller=Controller )

info("*** Creating nodes\n")
c1 = net.addController( 'c1')#, ip='127.0.0.1', port=6633 )
s2 = net.addSwitch( 's2', protocols='OpenFlow10', listenPort=6673, mac='00:00:00:00:00:02' )
h3 = net.addHost( 'h3', mac='00:00:00:00:00:03', ip='10.0.0.3/8' )
h4 = net.addHost( 'h4', mac='00:00:00:00:00:04', ip='10.0.0.4/8' )
h5 = net.addHost( 'h5', mac='00:00:00:00:00:05', ip='10.0.0.5/8' )
h6 = net.addHost( 'h6', mac='00:00:00:00:00:06', ip='10.0.0.6/8' )
h7 = net.addHost( 'h7', mac='00:00:00:00:00:07', ip='10.0.0.7/8' )
h8 = net.addHost( 'h8', mac='00:00:00:00:00:08', ip='10.0.0.8/8' )
h9 = net.addHost( 'h9', mac='00:00:00:00:00:09', ip='10.0.0.9/8' )
h10 = net.addHost( 'h10', mac='00:00:00:00:00:0a', ip='10.0.0.10/8' )

info("*** Creating links\n")
net.addLink(s2, h3, bw=1000)
net.addLink(s2, h4, bw=100, delay='1ms', loss=2)
net.addLink(s2, h5, bw=100, delay='2.5ms', loss=2)
net.addLink(s2, h6, bw=100, delay='5ms', loss=2)
net.addLink(s2, h7, bw=100, delay='10ms', loss=2)
net.addLink(s2, h8, bw=100, delay='25ms', loss=2)
net.addLink(s2, h9, bw=100, delay='35ms', loss=2)
net.addLink(s2, h10, bw=100, delay='25ms', loss=1)

info("*** Starting network\n")
net.configureWifiNodes()
net.build()
c1.start()
s2.start( [c1] )


info("*** Running CLI\n")
CLI_wifi( net )

info("*** Stopping network\n")
net.stop()

if name == 'main':
setLogLevel( 'info' )
topology()`

[ramonfontes]

How can I reproduce the behavior mentioned by you?

[hdm0511]

could you please copy the code and ping h8 to h3 as above?

[hdm0511]

Or you can remote login to my system.

[ramonfontes]

Sorry, but I didn't notice any problem with the script.

[hdm0511]

that is the question. script is ok, but packet loss results are different from time to time.
is that Link in mininet-wifi add loss automatically according to wireless modelling?

++++++++++h3 ping h8 -c 100++++++++++++
--- 10.0.0.8 ping statistics ---
100 packets transmitted, 93 received, 7% packet loss, time 99226ms
rtt min/avg/max/mdev = 50.063/50.328/58.065/0.853 ms
++++++++++h8 ping h3 -c 100++++++++++++
--- 10.0.0.3 ping statistics ---
100 packets transmitted, 97 received, 3% packet loss, time 99175ms
rtt min/avg/max/mdev = 50.066/50.339/54.715/0.487 ms
++++++++++++++h8 ping h3 -c 100+++++++++++++++++
--- 10.0.0.3 ping statistics ---
100 packets transmitted, 95 received, 5% packet loss, time 99199ms
rtt min/avg/max/mdev = 50.048/50.247/50.538/0.198 ms