Mailinglist Archive: opensuse (3666 mails)

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Re: [SLE] DSL problem
  • From: Jeffrey Laramie <suse-linux-e@xxxxxxxxxxxxxx>
  • Date: Wed, 2 Mar 2005 09:00:09 -0500
  • Message-id: <200503020900.09821.suse-linux-e@xxxxxxxxxxxxxx>
On Wednesday 02 March 2005 09:37, Damon Register wrote:
> Jeffrey Laramie wrote:
> > OK, well I think this is probably a routing problem then. It probably has
> > to do with the point Ian made about your IP addresses. If the DSL modem
> > insists on being then you should change the subnet of your
> > lan to
> I am really confused here. Why would a DSL modem be presenting an
> address like that? Why would a modem even have an address? Are
> you referring to the address your provider gives you? Just
> yesterday a coworker told me about his father who had Bellsouth.
> He said that Bellsouth was putting the users on a private subnet
> so it was impossible for the coworker to access his fathers pc with
> pcAnywhere. Is "your name" on such a private subnet? Is it Bellsouth?

This may vary based on the hardware. DSL services here use routers that are
assigned a valid external IP by the ISP and then route IPs in your subnet to
the inet facing NIC in your firewall box or alternately to a hub/switch. If
you connect a firewall then you use NAT/masq on the firewall to connect the
private IPs on the lan to the internet. If you use a hub/switch then the
boxes on that subnet should have valid external IPs assigned.

In his original post the OP assigned 3 different IPs in the same local subnet
so I assumed that represented 1 remote DSL router and 2 NICs on the host. If
there is only a dsl modem and one NIC then I don't know what the other IP is
assigned to. Jim, maybe you can clarify this by posting the output of
ifconfig and describing the physical layout of your LAN.

> > something else like Try this:
> Yes, this is very important. It must be on a different subnet
> > DSL modem -
> > inet facing NIC -
> > LAN facing NIC -
> > LAN Client -
> >
> > Make sure masquerading and IP forwarding are up. You'll need to configure
> > your routing table too, setting your default gateway to I'm
> > not
> No, the default gateway should be, the address of the LAN
> facing NIC.

That's correct for the clients on the LAN, but the host acting as a router
needs to have the default route set to the internet facing device. Otherwise
that host/router will send all non-local traffic back to the LAN. I'd post an
example from my firewall but it's a lot different configuration and would
only confuse the issue.

> > reached the end of my usefulness (at least for today, although I fear
> > permanent obsolescence is approaching faster than I care to admit).
> Is that a funny way of saying you are getting older?

Yup, fraid so.


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