[18503] in North American Network Operators' Group
Re: CIDR on 3Com Netbuilder
daemon@ATHENA.MIT.EDU (Brian Horvitz)
Fri Jul 31 09:12:47 1998
Date: Fri, 31 Jul 1998 09:00:58 -0400 (EDT)
From: Brian Horvitz <horvitz@shore.net>
To: "Martin, Christian" <CMartin@mercury.balink.com>
cc: "'nanog@merit.edu'" <nanog@merit.edu>, NOC <NOC@mercury.balink.com>
In-Reply-To: <c=US%a=_%p=BAIS%l=MERCURY-980731005608Z-9113@mercury.balink.com>
Well, I used to have OSPF running on a couple of NetBuilders, and my
biggest complaint was that they didn't support subnet-zero routes. I had
a bunch of Portmasters advertising routes that the NBs couldn't
understand. Other than that, it handled CIDR fine.
Brian
On Thu, 30 Jul 1998, Martin, Christian wrote:
> All,
>
> Anyone know how to configure a 3Com NetBuilder to support classless
> routing? Here is the scenario. I have a class B that is being split up
> into 24s and 26s. All are being statically routed over the respective
> WAN interfaces to the customer prem. Most default back to our WAN
> interfaces (some downstream BGP peers, but not in this scenario).
> Customer A has a 3Com Netbuilder, with an LAN IP of x.x.200.1 /24.
> Customer B has a Cisco 2501 with a LAN IP of x.x.23.1 /24. This
> customer is configured for classless routing using the 'ip classless'
> IOS global command. All customers can see into this network (cust B),
> even within the same x.x classfull class B space. But no one in the
> classfull x.x can see into customer A's network. Actually, their
> traffic gets there, but the return traffic never leaves, because the
> NetBuilder is looking at the first 3 bits and ignoring it, thinking that
> it is local.
>
> 3Com thinks that there needs to be static routes in place. I think that
> this is ridiculous, and that CIDR support is necessary in today's
> Internet. It would entail me having to ask a customer to add over 25
> static routes for networks that the default rtr (me) knows about. Does
> anyone know how to do this without having a CIDR-aware routing protocol
> like OSPF running? I have had three 3Com guys on the this ticket for
> over a week, with no resolution. 3Com employees can redeem their
> company by supplying a working solution...Anyone?
>
> Regards,
> -Chris
>
