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

[Phillip Grasso]

noob action 1. They block / null route valid public addresses but don't
follow rir / relevant internet updates on used addressing space. if you
block it, be sure to unblock it when time is right.
noob action 2. They use valid public addresses inside rather then rfc1918
space. <- If your this type of noob, the noob monster is coming for you.

May the noob monster be blackholio your routes.


On Mon, Dec 3, 2012 at 10:55 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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