Re: Networking and Passwords - What is and isn't possible?
From: Rev. Don Kool (oldno7@comcast.net)
Date: 04/13/03
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Date: Sat, 12 Apr 2003 22:05:58 -0400 From: "Rev. Don Kool" <oldno7@comcast.net>
Mike wrote:
> Thanks Don,
No problem.
> It does help.
Glad to hear it.
> Primarily because, yes, I am tinkering to learn.
More power to you. Glad to hear it!! More people should do that with
UNIX systems.
> I thought
> that routers usually did IPMasquerade and hubs didn't. The problem is that
> the DSL modem in this case does IPMasquerade as well and has only web based
> configuration,
I haven't been saddled with a DSL modem but I do use a cable modem at
home. If we can assume that they are similar (i.e., as far as the
computer/hub is concerned, they are the equivalent of a network drop
cable), the ISP configures the modem and the modem acts (in the ISP's
perfect world) to DHCP a Windows PC. The hub fools it into thinking
that it's a single PC and then serves out non-routable addresses for as
many computers as you wish to connect. It also does NAT to assure the
ISP that you you're only using one IP address.
> additionally it assigns multiple addresses but only will
> provide service for one address.
Exactly; the hub takes that one address, assigns 192.168.1.XXX
addresses to its connected computers and does NAT to make them all
appear to be using that one address.
> In cases where I've supported this modem
> on a router (I worked for the company that produced it) customers had
> repeated problems with routers due to the way it handles PPPoE
> configuration with conjunction with DHCP. If on a hub then each computer
> would get assigned an IP address directly by the modem as opposed to each
> being assigned by the router in router configurations.
If on a hub, and being set for DHCP, each computer will get assigned an
IP address from the hub, not the DSL router. Only the hub gets its
assigned IP from the DSL router. (In any event, simply assigning static
IPs to the three computers in your setup would be even simpler (e.g.
192.168.1.10, .11, .12)).
> Yeah it is possible to do what you describe with a router but it disables
> the onboard firewall included with the DSL modem firmware.
I don't see how. Connecting the DSL modem to the WAN port on the hub
will still require everything to pass through the DSL modem and its
firewall.
> I'll probably
> end up doing this anyway but wondered mainly if there was a way to keep
> computers from receiving DHCP by adding a second DHCP server to the mix.
Again, as a learning exercise, go for it but as a configuration, that
is needlessly complex. You seem to understand the simplicity of what I
suggested earlier so you know that you can always go with that if you
just want to get everything on-line with a minimum of fuss.
> As of yet I haven't been able to figure out a configuration that would
> ensure that computers would receive DHCP assignment only from the desired
> server.
The main problem is that you've got too many DHCP servers. The DSL
modem is a DHCP server to the hub, the hub is a DHCP server to its
connected computers and you've got a dual homed computer that you want
to make a DHCP server to others. Way, way too much complexity to get
three computers on-line. A simple little $75 LinkSys hub connected to
your DSL modem and you can be on line from all three computers in five
minutes.
Hope this helps,
Don
-- *************************** Q: How many frenchmen does it take * Rev. Don McDonald, SCNA * to defend Paris? * Baltimore, MD * A: No one knows, it's never been tried. *************************** http://mywebpages.comcast.net/oldno7/TheFrench.mpg Reluctant Yamaha YZF-R1 Owner
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