Michael Fountain quite correctly responded,
>On the router that is connected to the segment the hosts are on use
>the following command:
> ip helper-address x.x.x.x
>
>where x.x.x.x is the ip address of your DHCP server. The router
>will turn the dhcp request broadcast into a multicast and then
>forward it across the wan.
Just let me add a couple of capabilities.
If you have redundant DHCP servers on different subnets, one at
x.x.1.1/24 and another at x.x.2.1/24, and you want the DHCP request
to go to both of them, code
ip helper-address x.x.1.1
ip helper-address x.x.2.1
on each serverless segment router interface.
If you have redundant DHCP servers on the same subnet, one at
x.x.1.1/24 and another at x.x.1.2/24, and you want the DHCP request
to go to both of them, code
ip helper-address x.x.1.255
on each serverless segment router interface. Running 12.0 or later,
you must have
ip directed-broadcast
on the destination subnet router interface.
When you have directed broadcast running anywhere in your network,
and you are externally connected, block all externally originated
packets, at the gateway, that are destined for the network(s) on
which directed broadcast is enabled. So, for this example, your
gateway would include:
(More conservative -- if there are no servers that should ever be
accessed from the outside) applied at the external interface
access-list 100 deny any x.x.1.0 0.0.0.255
(permit other incoming traffic)
(Less conservative -- if say, there is an external DNS on the
segment) applied at the external interface
access-list 100 deny any x.x.1.255 0.0.0.0
(permit other incoming traffic)
>
>
>>
>>Hi all,
>> Iam having a DHCP server the hosts receiving them are in another place
>>and they are connected thru a WAN link using 2 routers.Since routers dont
>>broadcast by default,how can I broadcast my DHCP requests and replies between
>>the server and clients.Is it possible to use extended IP access-lists. like
>>that...
>>
>> Thanks in advance,
>>
>>Hari
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