Re: Level 3 BGP Advertisements

[Grzegorz Janoszka <Grzegorz () Janoszka pl>]

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