Re: (ASCEND) null route for disconnected dial-up users?

[David Lloyd <david@inxpress.net>]

On Wed, 20 Oct 1999, Stephen Mulrine wrote:

>We have all our dial-up users on the same subnet.  When packets arrive
>for disconnected users (e.g. SMTP), our MAX4030 sends them via the
>default route, and our router bounces them straight back to the MAX, and
>so on.  This is causing needless traffic to pass through our router and
>also doesn't look very elegant.
>
>When we had a Telebit Netblazer we could specify a null route for users
>who weren't dialled up.  I couldn't find any way of doing that, but I did
>try adding a static route for the subnet, pointing to a non-existent
>address on our network.  This was added as a private route, and in any
>case we supposedly have RIP switched off, but the MAX kept leaking this
>information into our servers' routing tables.
>
>Is there a solution for the packet-bouncing problem?  I'm using version
>7.0.0 which is quite stable for us - in fact our MAX has been up for 226
>days.  Ideally, disconnected hosts should be unreachable rather than
>have attempted connections to them time out.

The way we get around this, is by removing any static routes for the modem
subnets from our router, then enabling RIP in the router and the MAX.

Now our router only carries routes for connected users.  Any attempt to
reach a non-connected user results in a 'host unreachable' message.

Also, you may want to set up your router to filter out the 'fake' route.
I know this is pretty easy to do in CiscoLand.

===========================================================
David M. Lloyd                  mailto:david@inxpress.net

Administrator
Internet Express, Inc.
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