Demonstrate the use of
the IP Helper Address command to pass broadcasts from a network.
Equipment Requirements:
Three Routers
Two Switches
One workstation
One DHCP Server
Preliminary:
Before programming the routers, make
sure that the IOS version on the router supports Network Address
Translation. Load a new IOS version if necessary. Construct the
above network section using an appropriate routing protocol.
When construction of the network is
complete, verify that routers can communicate and are sharing their
routing tables. Also verify that the workstations are configured
correctly for the network in which they reside.
For verification use the show ip route command, show interfaces
command, show running-configuration command, ping, telnet, and any
other relevant command(s).
Router configurations (interfaces
subject to change based on routers used):
For this Lab we will be configuring
IP helper on Router-A. Helper commands change broadcast addresses to
a unicast address (an address of a single device on the network) so
that the broadcast message can be routed to a specific destination,
rather than everywhere. For our lab, we have a DHCP server on one
subnet, but need it to give out IP addresses to another subnetwork.
We do not have the funding for an additional DHCP server, so we must
make the server that we have give out IP addresses from its current
location.
Step 1
Build the network in the above
diagram. Use RIP or IGRP as your routing protocol.
Step 2
Configure the DHCP Server with a pool
of addresses that correspond to the addresses for the workstation.
Step 3
Set the workstation to obtain an IP
address automatically
Did the workstation obtain an
address? Explain.
Step 4
On router A use the IP helper address
command with the network number that the DHCP server resides on.