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

[Gordon Smith]

As others have said, null route the supernet/s with a high distance...

Also, if you haven't already seen it, you might find the templates that CYMRU put out a good source of additional information:

http://www.team-cymru.org/ReadingRoom/Templates/



-----Original Message-----
From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Mark Smith
Sent: Tuesday, 4 December 2012 5:13 AM
To: Shaun Deans
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Whats peoples BCP for Unused IP Space on Routers ?





----- Original Message -----
> From: Mark Newton <newton at atdot.dotat.org>
> To: Shaun Deans <shaun at kadeo.com.au>
> Cc: ausnog at lists.ausnog.net
> Sent: Monday, 3 December 2012 11:00 AM
> Subject: Re: [AusNOG] Whats peoples BCP for Unused IP Space on Routers ?
>
> On Mon, Dec 03, 2012 at 10:55:23AM +1100, Shaun Deans wrote:
>
>>  I'm looking for some quick feedback on what peoples BCP (Best Common
>>  Practice) is when it comes to unused ip space.
>
> Null route with a high administrative distance.
>

It's also worth disabling IP unreachables on the null0 interface as it causes the dropped packets to be dropped by CEF rather than punting them to the control plane for ICMP unreachable generation e.g.

(null0 is a hidden interface, it'll show up if you type in 'int null0')

int null0
no ip unreachables



"no ip unreachables" on the following:

http://www.bgpexpert.com/archive2003q4.php


And some Cisco.com text about it.

http://www.cisco.com/en/US/docs/routers/access/cisco_router_and_security_device_manager/25/software/user/guide/SAudt.html#wp1029695
_______________________________________________
AusNOG mailing list
AusNOG at lists.ausnog.net
http://lists.ausnog.net/mailman/listinfo/ausnog


The information contained in this email and any attachments may be confidential. This email and any attachments are also subject to copyright. No part of them may be reproduced, adapted or transmitted without the written permission of the copyright owner. If you are not the intended recipient, any use, interference with, disclosure or copying of this information is unauthorised and prohibited. If you have received this email in error, please immediately advise the sender by return email and delete the message from your system. All email communications to and from NEXTDC Limited are recorded for the purposes of archival and storage.