20210322 Bridge ( 一 )

課堂資料

Chih-Heng KeYouTube

課堂練習

cd mininet

mkdir mytest

cd mytest

4.py

gedit 4.py

4.py

#!/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')
  r1 = net.addHost('r1')
  r2 = net.addHost('r2')
  Link(h1, r1)
  Link(h2, r2)
  Link(r1, r2)
  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")
  r1.cmd("ifconfig r1-eth0 0")
  r1.cmd("ifconfig r1-eth1 0")
  r1.cmd("ip addr add 192.168.1.254/24 brd + dev r1-eth0")
  r1.cmd("ip addr add 10.0.0.1/24 brd + dev r1-eth1")
  r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  r1.cmd("ip route add 192.168.2.0/24 via 10.0.0.2")
  r2.cmd("ifconfig r2-eth0 0")
  r2.cmd("ifconfig r2-eth1 0")
  r2.cmd("ip addr add 192.168.2.254/24 brd + dev r2-eth0")
  r2.cmd("ip addr add 10.0.0.2/24 brd + dev r2-eth1")
  r2.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  r2.cmd("ip route add 192.168.1.0/24 via 10.0.0.1")
  CLI(net)
  net.stop()

python 4.py

xterm r1 r2 

r1

ip ro sh

exit

python 4.py

xterm h1 h2 

h1

ping 192.168.2.1

exit

5.py

gedit 5.py

5.py

#!/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')
  r1 = net.addHost('r1')
  r2 = net.addHost('r2')
  Link(h1, r1)
  Link(h2, r2)
  Link(r1, r2)
  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 22.1.1.1/24 brd + dev h2-eth0")
  h2.cmd("ip route add default via 22.1.1.254")
  r1.cmd("ifconfig r1-eth0 0")
  r1.cmd("ifconfig r1-eth1 0")
  r1.cmd("ip addr add 192.168.1.254/24 brd + dev r1-eth0")
  r1.cmd("ip addr add 12.1.1.1/24 brd + dev r1-eth1")
  r1.cmd("ip route add default via 12.1.1.2")
  r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  r1.cmd("iptables -t nat -A POSTROUTING -o r1-eth1 -s 192.168.1.0/24 -j MASQUERADE")
  r2.cmd("ifconfig r2-eth0 0")
  r2.cmd("ifconfig r2-eth1 0")
  r2.cmd("ip addr add 22.1.1.254/24 brd + dev r2-eth0")
  r2.cmd("ip addr add 12.1.1.2/24 brd + dev r2-eth1")
  r2.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  CLI(net)
  net.stop()

python 5.py

xterm h1 r1 r1

r1

wireshark

r1 - 2

h1

h1 ping h2 -c 5

h1

ping 127.0.0.1 -c 5

ping 192.168.1.1 -c 5

ping 192.168.1.254 -c 5

ping 12.1.1.1 -c 5

exit

cd ..

cd ..

Bridge

mkdir test-mininet

cd test-mininet

mkdir bridge

cd bridge

apt install bridge-utils

gedit 1.py

1.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  br1 = net.addHost('br1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("brctl addbr mybr")
  br1.cmd("brctl addif mybr br1-eth0")
  br1.cmd("brctl addif mybr br1-eth1")
  br1.cmd("brctl addif mybr br1-eth2")
  br1.cmd("ifconfig mybr up")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h3.cmd("ip address add 192.168.10.3/24 dev h3-eth0")
  CLI(net)
  net.stop()

python 1.py

h1 ping h2 -c 5

h1 ping h3 -c 5

exit

python 1.py

xterm br1

br1

ifconfig

brctl addbr mybr

brctl show

brctl addif mybr br1-eth0

brctl show

brctl addif mybr br1-eth1

brctl addif mybr br1-eth2

brctl show

ifconfig -a

ifconfig mybr up

ifconfig

h1 ping h2 -c 5

h1 ping h3 -c 5

h2 ping h3 -c 5

xterm h2

h2

tcpdump -i h2-eth0

h1 ping h3 -c 5

exit

gedit 2.py

2.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  h4 = net.addHost('h4')
  br1 = net.addHost('br1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.addLink(h4, br1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  h3.cmd("ifconfig h4-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("ifconfig br1-eth3 0")
  br1.cmd("brctl addbr mybr1")
  br1.cmd("brctl addbr mybr2")
  br1.cmd("brctl addif mybr1 br1-eth0")
  br1.cmd("brctl addif mybr1 br1-eth1")
  br1.cmd("brctl addif mybr2 br1-eth2")
  br1.cmd("brctl addif mybr2 br1-eth3")
  br1.cmd("ifconfig mybr1 up")
  br1.cmd("ifconfig mybr2 up")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h3.cmd("ip address add 192.168.20.1/24 dev h3-eth0")
  h4.cmd("ifconfig h4-eth0 192.168.20.2/4")
  CLI(net)
  net.stop()

python 2.py

br1 ifconfig

br1 brctl show

h1 ping h2 -c 5

h1 ping h3

h1 ping h4

h3 ping h4 -c 5

exit

gedit 2.py

2.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  h4 = net.addHost('h4')
  br1 = net.addHost('br1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.addLink(h4, br1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  h3.cmd("ifconfig h4-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("ifconfig br1-eth3 0")
  br1.cmd("brctl addbr mybr1")
  br1.cmd("brctl addbr mybr2")
  br1.cmd("brctl addif mybr1 br1-eth0")
  br1.cmd("brctl addif mybr1 br1-eth1")
  br1.cmd("brctl addif mybr2 br1-eth2")
  br1.cmd("brctl addif mybr2 br1-eth3")
  br1.cmd("ifconfig mybr1 up")
  br1.cmd("ifconfig mybr2 up")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h3.cmd("ip address add 192.168.20.1/24 dev h3-eth0")
  h4.cmd("ip address add 192.168.20.2/24 dev h4-eth0")
  CLI(net)
  net.stop()

python 2.py

h1 ping h2 -c 5

h1 ping h3

h1 ping h4

h3 ping h4

h3 ifconfig

h4 ifconfig

h4 ifconfig h4-eth0 0

h4 ifconfig h4-eth0 192.168.20.2/24

h3 ping h4 -c 5

exit

gedit 3.py

3.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  h4 = net.addHost('h4')
  br1 = net.addHost('br1')
  r1 = net.addHost('r1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.addLink(h4, br1)
  net.addLink(br1,r1)
  net.addLink(br1,r1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  h4.cmd("ifconfig h4-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("ifconfig br1-eth3 0")
  br1.cmd("ifconfig br1-eth4 0")
  br1.cmd("ifconfig br1-eth5 0")
  br1.cmd("brctl addbr mybr1")
  br1.cmd("brctl addbr mybr2")
  br1.cmd("brctl addif mybr1 br1-eth0")
  br1.cmd("brctl addif mybr1 br1-eth1")
  br1.cmd("brctl addif mybr1 br1-eth4")
  br1.cmd("brctl addif mybr2 br1-eth2")
  br1.cmd("brctl addif mybr2 br1-eth3")
  br1.cmd("brctl addif mybr2 br1-eth5")
  br1.cmd("ifconfig mybr1 up")
  br1.cmd("ifconfig mybr2 up")
  r1.cmd('ifconfig r1-eth0 192.168.10.254 netmask 255.255.255.0')
  r1.cmd('ifconfig r1-eth1 192.168.20.254 netmask 255.255.255.0')
  r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h1.cmd("ip route add default via 192.168.10.254")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h2.cmd("ip route add default via 192.168.10.254")
  h3.cmd("ip address add 192.168.20.1/24 dev h3-eth0")
  h3.cmd("ip route add default via 192.168.20.254")
  h4.cmd("ip address add 192.168.20.2/24 dev h4-eth0")
  h4.cmd("ip route add default via 192.168.20.254")
  CLI(net)
  net.stop()

python 3.py

net

br1 brctl show

h1 ping h2 -c 5

h1 ping h3 -c 5

h1 ping h4 -c 5

exit

apt install vlan

gedit 4.py

4.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if '__main__' == __name__:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  h4 = net.addHost('h4')
  br1 = net.addHost('br1')
  r1 = net.addHost('r1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.addLink(h4, br1)
  net.addLink(br1,r1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  h4.cmd("ifconfig h4-eth0 0")
  r1.cmd("ifconfig r1-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("ifconfig br1-eth3 0")
  br1.cmd("ifconfig br1-eth4 0")
  br1.cmd("vconfig add br1-eth4 10")
  br1.cmd("vconfig add br1-eth4 20")
  r1.cmd("vconfig add r1-eth0 10")
  r1.cmd("vconfig add r1-eth0 20")
  br1.cmd("brctl addbr mybr10")
  br1.cmd("brctl addbr mybr20")
  br1.cmd("brctl addif mybr10 br1-eth0")
  br1.cmd("brctl addif mybr10 br1-eth1")
  br1.cmd("brctl addif mybr10 br1-eth4.10")
  br1.cmd("brctl addif mybr20 br1-eth2")
  br1.cmd("brctl addif mybr20 br1-eth3")
  br1.cmd("brctl addif mybr20 br1-eth4.20")
  br1.cmd("ifconfig br1-eth4.10 up")
  br1.cmd("ifconfig br1-eth4.20 up")
  r1.cmd("ifconfig r1-eth0.10 up")
  r1.cmd("ifconfig r1-eth0.20 up")
  br1.cmd("ifconfig mybr10 up")
  br1.cmd("ifconfig mybr20 up")
  r1.cmd('ifconfig r1-eth0.10 192.168.10.254 netmask 255.255.255.0')
  r1.cmd('ifconfig r1-eth0.20 192.168.20.254 netmask 255.255.255.0')
  r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h1.cmd("ip route add default via 192.168.10.254")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h2.cmd("ip route add default via 192.168.10.254")
  h3.cmd("ip address add 192.168.20.1/24 dev h3-eth0")
  h3.cmd("ip route add default via 192.168.20.254")
  h4.cmd("ip address add 192.168.20.2/24 dev h4-eth0")
  h4.cmd("ip route add default via 192.168.20.254")
  CLI(net)
  net.stop()

python 4.py

xterm br1 r1

br1

ifconfig

r1

h1 ping h2 -c 5

h1 ping h3 -c 5

h1 ping h4 -c 5

br1

wireshark

h1 ping h3 -c 5

exit

gedit test.py

test.py

#! /usr/bin/env python
from mininet.cli import CLI
from mininet.net import Mininet
from mininet.link import Link,TCLink,Intf

if 'main' == name:
  net = Mininet(link=TCLink)
  h1 = net.addHost('h1')
  h2 = net.addHost('h2')
  h3 = net.addHost('h3')
  h4 = net.addHost('h4')
  br1 = net.addHost('br1')
  r1 = net.addHost('r1')
  net.addLink(h1, br1)
  net.addLink(h2, br1)
  net.addLink(h3, br1)
  net.addLink(h4, br1)
  net.addLink(br1,r1)
  net.build()
  h1.cmd("ifconfig h1-eth0 0")
  h2.cmd("ifconfig h2-eth0 0")
  h3.cmd("ifconfig h3-eth0 0")
  h4.cmd("ifconfig h4-eth0 0")
  r1.cmd("ifconfig r1-eth0 0")
  br1.cmd("ifconfig br1-eth0 0")
  br1.cmd("ifconfig br1-eth1 0")
  br1.cmd("ifconfig br1-eth2 0")
  br1.cmd("ifconfig br1-eth3 0")
  br1.cmd("ifconfig br1-eth4 0")
  br1.cmd("vconfig add br1-eth4 10")
  br1.cmd("vconfig add br1-eth4 20")
  r1.cmd("vconfig add r1-eth0 10")
  r1.cmd("vconfig add r1-eth0 20")
  br1.cmd("brctl addbr mybr10")
  br1.cmd("brctl addbr mybr20")
  br1.cmd("brctl addif mybr10 br1-eth0")
  br1.cmd("brctl addif mybr10 br1-eth1")
  br1.cmd("brctl addif mybr10 br1-eth4.10")
  br1.cmd("brctl addif mybr20 br1-eth2")
  br1.cmd("brctl addif mybr20 br1-eth3")
  br1.cmd("brctl addif mybr20 br1-eth4.20")
  br1.cmd("ifconfig br1-eth4.10 up")
  br1.cmd("ifconfig br1-eth4.20 up")
  r1.cmd("ifconfig r1-eth0.10 up")
  r1.cmd("ifconfig r1-eth0.20 up")
  br1.cmd("ifconfig mybr10 up")
  br1.cmd("ifconfig mybr20 up")
  r1.cmd('ifconfig r1-eth0.10 192.168.10.254 netmask 255.255.255.0')
  r1.cmd('ifconfig r1-eth0.20 192.168.20.254 netmask 255.255.255.0')
  r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
  h1.cmd("ip address add 192.168.10.1/24 dev h1-eth0")
  h1.cmd("ip route add default via 192.168.10.254")
  h2.cmd("ip address add 192.168.10.2/24 dev h2-eth0")
  h2.cmd("ip route add default via 192.168.10.254")
  h3.cmd("ip address add 192.168.20.1/24 dev h3-eth0")
  h3.cmd("ip route add default via 192.168.20.254")
  h4.cmd("ip address add 192.168.20.2/24 dev h4-eth0")
  h4.cmd("ip route add default via 192.168.20.254")
  CLI(net)
  net.stop()

sed -i '/^$/d' test.py

• 將原來的所有空行刪除並在每一行後面增加一空行

• 這樣在輸出的文本中每一行後面將有且只有一空行

gedit test.py