Odd announcement from AS27048

[jared at puck.nether.net (Jared Mauch)]

On Mar 12, 2013, at 10:23 AM, Christopher Morrow wrote:

> On Tue, Mar 12, 2013 at 9:55 AM, Alain Hebert <ahebert at pubnix.net> wrote:
>>    Hi,
>> 
>>    On the 5th we notice that 27048 was announcing 2 of ours /24
>> 
>>        812 3549 209 721 27064 27047 27047 27047 27048
>> 
> 
> maybe 721 doesn't have prefix AND as-path filters?  (or 209 maybe?)
> or intentional filtering gone wrong :(


http://puck.nether.net/bgp/leakinfo.cgi?search=do&search_prefix=&search_aspath=&search_asn=&recent=1000&source=nanog20130312

I know I see lots of these cases of intentional filtering gone wrong.

eg: XO(2828) routes being leaked via a customer to Cogent(174)

I didn't see anything related to 27048 in the past few years history at all, but there is bad filtering all over the place.

Please combine as-path filtering with your traditional prefix-list filtering as well to block these as-paths.

- Jared