[155892] in North American Network Operators' Group
Re: Level 3 BGP Advertisements
daemon@ATHENA.MIT.EDU (Grzegorz Janoszka)
Wed Aug 29 17:06:52 2012
Date: Wed, 29 Aug 2012 23:06:12 +0200
From: Grzegorz Janoszka <Grzegorz@Janoszka.pl>
To: nanog@nanog.org
In-Reply-To: <A5FACB06A6163C4790FAE19E1C9314D7013A4D4EE32C@MAILSRV.granbury.k12.tx.us>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 29-08-12 22:55, STARNES, CURTIS wrote:
> We are announcing our /19 network as one block via BGP through AT&T, not broken up into smaller announcements.
> Earlier in the year I started receiving complaints that some of our client systems were having problems connecting to different web sites.
> After much troubleshooting I noticed that in every instance the xlate in our Cisco ASA for the client's IP last octet was either a 0 or 255.
> Since I am announcing our network as a /19, the subnet mask is 255.255.224.0, that would make our network address x.x.192.0 and the broadcast x.x.223.255.
> So somewhere the /24 boundary addresses were being dropped.
>
> Just curious if anyone else has seen this before.
Yes, actually there are people over Internet blocking all IP's ending
with 0 or 255 as a kind of bogon or other old wives' tale.
--
Grzegorz Janoszka
