/27 the new /24

Suresh Ramasubramanian ops.lists at gmail.com
Fri Oct 2 16:57:53 UTC 2015


There would be a default route sure - but the filter simply means that if your packets from say a src IP in a level 3 /24 (where the minimum alloc size was what, /20) wouldn't go through if you sent them though say a cogent interface

--srs

> On 02-Oct-2015, at 10:04 PM, William Herrin <bill at herrin.us> wrote:
> 
> On Fri, Oct 2, 2015 at 11:55 AM, Suresh Ramasubramanian
> <ops.lists at gmail.com> wrote:
>> Besides which more than one provider filters by a minimum prefix length
>> per /8 - wasn't  Swisscom or someone similar doing that?  So multi
>> homing with even a /24 is somewhat patchy in terms of effectiveness
> 
> Hi Suresh,
> 
> That hasn't been true for something like a decade. Anybody who filters
> anything shorter than /24 without also taking a default route (or the
> equivalent) is not fully connected to the Internet.
> 
> Regards,
> Bill Herrin
> 
> 
> 
> -- 
> William Herrin ................ herrin at dirtside.com  bill at herrin.us
> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>



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