[AusNOG] Whats peoples BCP for Unused IP Space on Routers ?

[Scott Howard]

Completely unrelated to your question, but rather than using 1.2.3.0 or
similar networks for examples like this, keep in mind that there's a
dedicated range allocated for "documentation and examples" - 192.0.2.0/24

There are also corresponding domains example.com, example.net and
example.org (These domains do actually exist, but just point to IANA to
when points to the relevant RFC)

  Scott



On Mon, Dec 3, 2012 at 6:55 AM, Shaun Deans <shaun at kadeo.com.au> wrote:

> Morning Noggers ?
>
> I'm looking for some quick feedback on what peoples BCP (Best Common
> Practice) is when it comes to unused ip space. For example if you have
> the ip range 1.2.3.0/24 and you only have 1.2.3.0/25 active/routed
> what do you do with 1.2.3.128/25.
>
> I have seen many techniques including:
> - ACLs (Bad IMHO as it requires CPU cycles)
> - Tying to a Loopback (Bad: Leaves ip's open on router which require
> acls/cpu)
> - Null routing ( would be my pick)
> - Nothing at all (Very Bad as it would bubble up causing routing loops)
>
> Gave it a google and there were no real BCP's that stood out so im
> interested to hear what everyone else does ?
>
> Cheers
>
> S
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