DHCP an NAT

[Nathan Burgener]

Thanks that is working.

And I have no possibility, to put the DHCP server in the network A and  
the server is answering on the NAT address?


Am 15.07.2008 um 14:56 schrieb Glenn Satchell:

>
>
>> From: Nathan Burgener <nathan.burgener at stud.hslu.ch>
>> To: dhcp-users at isc.org
>> Subject: Re: DHCP an NAT
>> Date: Tue, 15 Jul 2008 13:39:36 +0200
>>
>>
>> Unfortunately I need the NAT.
>> So there is no possibility to configure the server, that it doesn't
>> answer to 192.168.3.1 but on 172.18.1.1 ?
>>
>> I have another idea. I can install the DHCP server in the same
>> network, where the client is. But I must configure the server with
>> special options, because the client will boot an image from the TFTP
>> in network A.
>> I know, how I can configure the filename. But how can I configure,
>> that the filename is not on the DHCP server, but on another server?
>
> There are two possibilities, and you'll need to consult your client's
> documentation to see which one it uses (or just try both):
>
> next-server 172.18.1.1;
> option tftp-server "172.18.1.1";
>
> next-server is documented in dhcpd.conf man page, and tftp-server in
> dhcp-options man page.
>
> regards,
> -glenn
>
>>
>> Am 15.07.2008 um 13:27 schrieb Simon Hobson:
>>
>>>
>>> At 12:53 +0200 15/7/08, Nathan Burgener wrote:
>>>> Hello
>>>>
>>>> I have 2 networks, which are connected over a VPN. In the network
>>>> A, there is a DHCP server.
>>>> In network B I have the client. But all client address from source
>>>> 192.168.3.x get a IP from network 172.18.1.x with NAT and then the
>>>> traffic goes through the VPN tunnel.
>>>> On the router in network B I have an ip helper-address to the DHCP
>>>> server.
>>>>
>>>> Now the server gets the Discover from the client with the following
>>>> informations:
>>>> Source IP 172.168.1.1
>>>> Destination: Address from DHCP server
>>>> Relay Agent IP Address: 192.168.3.1
>>>>
>>>> The DHCP server will now send back the offer. But the servers sends
>>>> it to 192.168.3.1 and not to the address 172.168.1.1
>>>> How can I change that?
>>>
>>> Quick answer: Fix your network !
>>> NAT == broken<period> and DHCP will not work in this setup.
>>>
>>> You might be able to work around part of it by adding appropriate
>>> routing and/or nat rules to get the packets back to the relay agent,
>>> or by being creative with shared-network, but then the clients will
>>> not be able to renew their leases later and things will still break.
>>>
>>> Can you remove the nat and make traffic routable between the server
>>> subnet and the 192.163.3.x subnet ?
>>>
>>>
>>
>>
>
>