Network, routers, DHCP and PXE

[Subhro]

Just to add to that suggestion, if you have a separate DHCP server,
make sure your router works as a DHCP client for the internal network
as well. You should be able to do that by telnetting into the
management port. You may use a serial cable as well.

This is required in order to get the NAT working properly.

Thanks
Subhro

On Mon, Jul 28, 2008 at 1:18 PM, Manolis Kiagias <sonic2000gr at gmail.com> wrote:
> Svein Halvor Halvorsen wrote:
>>
>> Hi, list!
>>
>>
>> I have a private home network, on an ADSL2+ connection to the
>> internet. The home network is behind NAT, all automatically set up
>> by the router/dhcp server/wlan access point/adsl modem that I got
>> from my ISP. It's a Thomson SpeedTouch 585 router.
>>
>> Now, on this network, most of the computers get their IP by means of
>> DHCP. Except our home audio server, which have a hard coded ip
>> address in rc.conf, set to something within the range of the dhcp
>> server (10.0.0.2-10.0.0.253). The server seems to pick this up, and
>> don't give that address away to someone else.
>>
>
> You may also want to ensure that the router will never allocate your static
> IP address to someone else.
> Look at the DHCP router settings either for DHCP scope (set it to narrower
> values, and use a static IP outside the range) or for something like
> exceptions / exclusion where you can mark a specific IP that DHCP will never
> assign.
>>
>> I've tried using other addresses outside this range, like 10.0.1.1,
>> but that doesn't work. All network access is lost when I do that.
>>
>
> 10.0.1.1 is a different network (I assume your netmask is 255.255.255.0, but
> check your router or your clients)
>
>> Now, on my local network I'd like to put a diskless machine. As I
>> understand it, my DHCP server needs to tell the client about the
>> "filename" and a "next-server" to use. I don't think I can setup the
>> Thomson router to do this. All the instruction I can find online
>> advises me to install a DHCP server on the same machine that serves
>> the pxe boot image. But if I do that, I'll get two DHCP servers on
>> my local network. Is that ok? Will there be a race condition, when a
>> client asks for an IP address?
>>
>
> You will have to shutdown the router's DHCP. Probably disable it permanently
> and assign this function to a machine.
> The DHCP of the router also sends you the following information (besides IP
> address):
>
> - DNS Server(s): Either the ones used by your ISP (consult its website) or
> its own address (i.e. 10.0.0.1). Most routers send their own address as a
> DNS server and perform the resolution by sending your request to ISP
> servers.
> - Gateway address: This is always the router's local IP address (i.e.
> 10.0.0.1)
>
> If you setup your own DHCP server, make sure it is set to send this info as
> well. (These are commonly known as DHCP options)
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-- 
Subhro Kar
Software Engineer
Dynamic Digital Technologies Pvt. Ltd.
EPY-3, Sector: V
Salt Lake City
700091
India