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  1. Thanks for your kind words :slight_smile: The e-books are available through Clickbank and the hardcopies through Amazon.com, you can use a creditcard or paypal. If those are not accepted then we can always look for another online payment method that you can use...

  2. Hi rené, i have another question: How can we use DHCP Relay when we have multiple subinterfaces for multiple VLANs on the fastethernet 0/0 ( ie: fastethernet 0/0.1, 0/0.2 and so on) of the middle router knowing that each VLAN has its own addressing scheme ??

    Mohamed

  3. I just found this and i think it solves the problem: while configuring the DHCP router for multiple VLANs, we must specify the default-router (it's the gateway adress of each VLAN) from which the request is comming (as shown below). This way the DHCP router assigns IPs from the particular pools of each VLAN.

    (config)# ip dhcp pool VLAN1
    (dhcp-config)# network 172.16.1.0 255.255.255.0
    (dhcp-config)# default-router 172.16.1.1
    (dhcp-config)# exit
  4. Hi Rene,

    Will the ip helper-address always be the address of the interface on the the DHCP server that connects to the DHCP relay?

  5. Hi Shree,

    Nothing will change. The router that is configured for DHCP relay will create these unicast packets. Other routers only have to route these packets to the DHCP server, that's it. Here's a packet capture of these unicast packets btw:

    DHCP Relay Unicast Packets

    Rene

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