# Mininet3 Analysis Result

[TOC]

## Analysis result (畫圖)

apt install gnuplot

 iperf -c 10.0.0.2 -t 10 

iperf -s -i 1 | tee tcp.txt


tee :將標準輸入複製到每個文件，也複製到標準輸出

---

清理數據

cat tcp.txt | grep Mbits | head -n 10 | tr "-" " " | awk '{print $4,$8}'

tr (replace)
awk (show the column)


### Gnuplot

gnuplot


#### plot (畫圖)

gnuplot> plot "tcpClear.txt" title "tcp" with linespoints


gnuplot> set yrange[0:5]
gnuplot> set ytics 0,1,10
gnuplot> replot

Range 0~5
每小格 切10塊


### x y 軸 說明 跟 Title

gnuplot> set xlabel "Time(sec)"
gnuplot> set ylabel "Throughput(Mbps)"
gnuplot> set title "TCP"
gnuplot> replot


#### Save image

gnuplot> set terminal png
gnuplot> set output "tcp.png"
exit 


python script

Topology 1


#!/usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink
 
if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  Link(h1, h2)
  net.build()
  CLI(net)
  net.stop()

TCLink 可以設定 Bandwidth or Delay or loss Rate(比較強)

Topology2


#!/usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink
 
if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  r = net.addHost('r')
  Link(h1, r)
  Link(h2, r)
  net.build()
  CLI(net)
  net.stop()

H1

root@ubuntu:/home/user/scriptTopology# ifconfig h1-eth0 0
root@ubuntu:/home/user/scriptTopology# ifconfig h1-eth0 192.168.1.1/24
root@ubuntu:/home/user/scriptTopology# ip route add default via 192.168.1.254

root@ubuntu:/home/user/scriptTopology# ip route show
default via 192.168.1.254 dev h1-eth0 

root@ubuntu:/home/user/scriptTopology# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.254   0.0.0.0         UG    0      0        0 h1-eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 h1-eth0

H2

root@ubuntu:/home/user/scriptTopology# ifconfig h2-eth0 0
root@ubuntu:/home/user/scriptTopology# ifconfig h2-eth0 192.168.2.1/24


root@ubuntu:/home/user/scriptTopology# ip route add default via 192.168.2.254
root@ubuntu:/home/user/scriptTopology# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.2.254   0.0.0.0         UG    0      0        0 h2-eth0
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 h2-eth0

Router

root@ubuntu:/home/user/scriptNet# ifconfig r-eth0 192.168.1.254/24
root@ubuntu:/home/user/scriptNet# ifconfig r-eth1 192.168.2.254/24
root@ubuntu:/home/user/scriptNet# ifconfig

r-eth0    Link encap:Ethernet  HWaddr 96:1b:78:5b:20:a4  
          inet addr:192.168.1.254  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::941b:78ff:fe5b:20a4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:648 (648.0 B)  TX bytes:828 (828.0 B)

r-eth1    Link encap:Ethernet  HWaddr f2:e2:4e:0f:9b:2c  
          inet addr:192.168.1.254  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::f0e2:4eff:fe0f:9b2c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:648 (648.0 B)  TX bytes:648 (648.0 B)

h1 ping h2


Routing status

可以去check

root@ubuntu:/home/user/scriptNet# cat /proc/sys/net/ipv4/ip_forward
1

1 -> enable 如果為1 表示有router 有forward 的功能
0 -> disable

root@ubuntu:/home/user/scriptNet#echo 1 > /proc/sys/net/ipv4/ip_forward
root@ubuntu:/home/user/scriptNet#echo 0 > /proc/sys/net/ipv4/ip_forward

### CLI 寫進 python Script

#!/usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink
 
if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  r = net.addHost('r')
  Link(h1, r)
  Link(h2, r)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h1.cmd("ip addr add 192.168.1.1/24 brd + dev h1-eth0")
  h1.cmd("ip route add default via 192.168.1.254")
  h2.cmd("ifconfig h2-eth0 0")
  h2.cmd("ip addr add 192.168.2.1/24 brd + dev h2-eth0")
  h2.cmd("ip route add default via 192.168.2.254")
  r.cmd("ifconfig r-eth0 0")
  r.cmd("ifconfig r-eth1 0")
  r.cmd("ip addr add 192.168.1.254/24 brd + dev r-eth0")
  r.cmd("ip addr add 192.168.2.254/24 brd + dev r-eth1")
  r.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  CLI(net)
  net.stop()

CLI(net) -> Display mininet prompt