nanog mailing list archives
Re: Level 3 BGP Advertisements
From: james machado <hvgeekwtrvl () gmail com>
Date: Wed, 29 Aug 2012 15:30:22 -0700
On Wed, Aug 29, 2012 at 1:55 PM, STARNES, CURTIS <Curtis.Starnes () granburyisd org> wrote:
Sorry for the top post... Not necessarily a Level 3 problem but; 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.
some OS's by M and others as well as some devices have IP stacks which will not send or receive unicast packets ending in 0 or 255. have had casses where someone was doing subnets that included those in the DCHP scopes and the computers that received these addresses were black holes. james
Current thread:
- Re: Level 3 BGP Advertisements, (continued)
- Re: Level 3 BGP Advertisements Berry Mobley (Aug 29)
- Re: Level 3 BGP Advertisements Jon Lewis (Aug 29)
- Re: Level 3 BGP Advertisements Randy (Aug 29)
- RE: Level 3 BGP Advertisements Hale, William C (Aug 29)
- Re: Level 3 BGP Advertisements William Herrin (Aug 29)
- $10k per BGP prefix? (was Re: Level 3 BGP Advertisements) Jay Ashworth (Aug 29)
- Re: $10k per BGP prefix? (was Re: Level 3 BGP Advertisements) Peter Kristolaitis (Aug 29)
- Re: $10k per BGP prefix? (was Re: Level 3 BGP Advertisements) William Herrin (Aug 29)
- RE: Level 3 BGP Advertisements STARNES, CURTIS (Aug 29)
- Re: Level 3 BGP Advertisements Grzegorz Janoszka (Aug 29)
- Re: Level 3 BGP Advertisements james machado (Aug 29)
- RE: Level 3 BGP Advertisements John van Oppen (Aug 29)
- Re: Level 3 BGP Advertisements Matt Addison (Aug 29)
- Re: Level 3 BGP Advertisements Blake Hudson (Aug 30)
- Re: Level 3 BGP Advertisements james machado (Aug 30)
- RE: Level 3 BGP Advertisements John van Oppen (Aug 30)
- Re: Level 3 BGP Advertisements Mikael Abrahamsson (Aug 30)
- $10k per BGP prefix? (was Re: Level 3 BGP Advertisements) Jay Ashworth (Aug 29)
- RE: Level 3 BGP Advertisements Harry Hoffman (Aug 29)
- Re: Level 3 BGP Advertisements Jon Lewis (Aug 29)