Reviewing IP Traffic and Configuring Routes
Enterasys C3 Configuration Guide 25-19
• Replacing the destination IP address with the address of the DHCP server,
• Replacing the source IP address with its own address (that is, the IP address of the local
routed interface), and
• Within the BOOTP part of the packet, changing the Relay Agent IP address from 0.0.0.0 to the
address of the local routed interface.
The last change to the BootP packet “tells” the DHCP server that it needs to assign an IP address
that is in the same subnet as the Relay Agent IP. When the response comes from the server, the
DHCP/BOOTP relay agent sends it to the host.
For other protocols specified through the ip forward-protocol command, the system forwards
broadcast UDP traffic as a unicast packet to the specified IP addresses.
Example
This example show how to have all client DHCP requests for users in VLAN 1 to be forwarded to
the remote DHCP server with IP address 192.168.1.28.
C3(su)->router(Config)#interface vlan 1
C3(su)->router(Config-if(Vlan 1))#ip helper-address 192.168.1.28
Reviewing IP Traffic and Configuring Routes
Purpose
To review IP traffic and configure routes, to send router ICMP (ping) messages, and to execute
traceroute.
Commands
show ip route
Use this command to display information about IP routes.
Syntax
show ip route [destination-prefix | connected | ospf | rip | static | summary]
Parameters
For information about... Refer to page...
show ip route 25-19
ip route 25-21
ping 25-21
traceroute 25-22
destination-prefix (Optional) Displays any routes that match the prefix.
connected (Optional) Displays connected routes.
ospf (Optional) Displays routes configured for the OSPF routing protocol. For
details on configuring OSPF, refer to “Configuring OSPF” on page 27-2.
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