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README.md
README.md
 
 
dhcp.py
dhcp.py
 
 

README.md

DHCP

In this example, we show how to deploy a dhcp server inside the SEED Emulator and how to set a host's ip with the installed dhcp server. We first create dhcp servers on AS151 and AS152 controller. We then 2 hosts in each AS to get ip address from the installed dhcp server.

See the comments in the code for detailed explanation.

We can utilize DHCP on C03-bring-your-own-internet. When we connect external devices such as computer, smartphone, and IoT device to a internet emulator, the installed dhcp will assign ip address to the newly attached devices so that they can communicate with the nodes inside the emulator and use internet service.

Step 1) Deploy a dhcp

# Create a DHCP server (virtual node).
dhcp = DHCPService()

# Default DhcpIpRange : x.x.x.101 ~ x.x.x.120
# Set DhcpIpRange : x.x.x.125 ~ x.x.x.140
dhcp.install('dhcp-01').setIpRange(125, 140)
dhcp.install('dhcp-02')


# Customize the display name (for visualization purpose)
emu.getVirtualNode('dhcp-01').setDisplayName('DHCP Server 1')
emu.getVirtualNode('dhcp-02').setDisplayName('DHCP Server 2')


# Create new host in AS-151 and AS-161, use them to host the DHCP servers.
# We can also host it on an existing node.
as151 = base.getAutonomousSystem(151)
as151.createHost('dhcp-server-01').joinNetwork('net0')

as161 = base.getAutonomousSystem(161)
as161.createHost('dhcp-server-02').joinNetwork('net0')

# Bind the DHCP virtual node to the physical node.
emu.addBinding(Binding('dhcp-01', filter = Filter(asn=151, nodeName='dhcp-server-01')))
emu.addBinding(Binding('dhcp-02', filter = Filter(asn=161, nodeName='dhcp-server-02')))

Use method DHCPServer:setIpRange to set the ip range to assign. The default IP range of Emulator is as below.

  • host ip range : 71-99
  • dhcp ip range : 101-120
  • router ip range : 254-200

DHCPServer:setIpRange can change dhcp ip range. To change entire ip range, we can use Network:setHostIpRange(), Network:setDhcpIpRange(), and Network:setRouterIpRange().

Step 2) Set host to use dhcp

# Create new hosts in AS-151, use it to host the Host which use dhcp instead of static ip
as151.createHost('dhcp-client-01').joinNetwork('net0', address = "dhcp")
as151.createHost('dhcp-client-02').joinNetwork('net0', address = "dhcp")

# Create new hosts in AS-161, use it to host the Host which use dhcp instead of static ip
as161.createHost('dhcp-client-01').joinNetwork('net0', address = "dhcp")
as161.createHost('dhcp-client-01').joinNetwork('net0', address = "dhcp")