Re: Static IP outside of router DHCP range

On Mon, 21 Sep 2009 21:17:25 -0400, ohaya <ohaya@xxxxxxx> wrote:



Smarty wrote:
"VanguardLH" <V@xxxxxxxxx> wrote in message
news:h987jc$ea5$1@xxxxxxxxxxxxxxxxxxxx

Smarty wrote:

The interest in Mac addresses I stated was merely
to explore the ironic fact that each of my 8 media player boxes has a
clearly defined MAC address which my video server "could" use to
facilitate
and stabilize my re-boot problem, yet there is no (apparent) way to take
advantage of them. This would avoid the need for DHCP entirely,
whereas now
each of these 8 devices has to initiate a DHCP, then BootP process
which can
take tens of minutes after a power glitch. I am hoping that fixing
the video
server IP statically will at least avoid the problem of the clients
finding
the server after a server IP address change.


As I recall (been a long time), the clients that use BootP will pull
their code from a configured server. So once you fix to a static IP
address for the server, DHCP isn't involved anymore. Well, it's still
involved for the clients if they are still using DHCP but you could
change them to static IP addresses, too, and complete get rid of DHCP.
However, I don't think DHCP is what is taking so long. Do the clients
actually still want to use BootP to get an IP address assigned to them
if they were also using a static IP address? Unless you actually need
DHCP from the router, you could turn it off in the router and use static
IP addresses for all your hosts. With them all using static IP
addresses, none of them would need to use DHCP and probably not BootP.



Unfortunately my 8 clients are little $50 boxes with an Ethernet port
and yellow, red, and white outputs for composite NTSC video and stereo
audio, but no provisions whatsoever to flash their NVRAM. I think they
are actually PROM'ed with soldered-in firmware, and they have no ability
to have static IP assignments in their boot code. My 8 boxes have the
so-called "Rev 1.0" boot ROM which makes them the least capable of all
the ones which Hauppage offers. They are vintage-1995 hardware.

So I have no way to either reserve IP addresses based on Mac addresses,
nor do I have a way to set them up as static.

I still am wondering if my Netgear switches truly have any "memory" of
the ports associated with specific IP addresses of the connected
clients, as they have no reset or reboot function as far as I know. It
seems that removing power from the switches and then bringing them back
up again does force a "reboot" of some type, since they seem to connect
and work quickly after the power is re-cycled. I know that switches
create a routing table so as to not multicast / flood all of the ports
when a device is only present at one port. It just is not clear to me
under what circumstances this table is updated, or for that matter built
from scratch.

Thanks once again for your assistance.


Hi,

A bit weird idea, but maybe instead of using those Netgear switches, use
a hub? That should eliminate any concerns that the hub is persisting
information about which client/IP/MAC is on which port?

If it's a layer 2 switch then I don't believe it would make any
difference since they work on MAC addresses, not IP addresses.
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