I recently deployed a multihome BGP configuration at our location. Now I am having issues of some of my netblocks not being reachable or not being able to reach certain networks. I am uncertain what the issue might be. Right now I have visi.com as one provider (AS8015), and Qwest (AS3908) as the other. When I look at the as-paths for my netblocks the ones from visi.com look fine, 208.42.20.0/23 and 208.42.104.0/23, the ones from Qwest go through visi.com and then on to us, 65.116.186.0/24, 65.121.8.0/23. The Qwest networks are the ones that I am having problems reaching hosts from or getting to from other networks. Any insight would be greatly appreciated, if anyone needs more information just let me know and I can supply router configs or whatever might be needed. Thank you in advance. -- Bret Baptist Systems and Technical Support Specialist bbaptist@iexposure.com Internet Exposure, Inc. http://www.iexposure.com (612)676-1946 x17 Web Development-Web Marketing-ISP Services ------------------------------------------ Today is the tomorrow you worried about yesterday.
On woensdag, sep 17, 2003, at 22:04 Europe/Amsterdam, Bret Baptist wrote:
Right now I have visi.com as one provider (AS8015), and Qwest (AS3908) as the other. When I look at the as-paths for my netblocks the ones from visi.com look fine, 208.42.20.0/23 and 208.42.104.0/23, the ones from Qwest go through visi.com and then on to us, 65.116.186.0/24, 65.121.8.0/23. The Qwest networks are the ones that I am having problems reaching hosts from or getting to from other networks.
When I look at telnet:route-views.oregon-ix.net I see lots of flap dampening. So your BGP announcements keep going down and coming back up. Also in most cases the AS path ends in 3908 8015 30309 and/or there is lots of prepending happening all over the place. Iljitsch van Beijnum
Bret Baptist wrote: [...]
Right now I have visi.com as one provider (AS8015), and Qwest (AS3908) as the other. When I look at the as-paths for my netblocks the ones from visi.com look fine, 208.42.20.0/23 and 208.42.104.0/23, the ones from Qwest go through visi.com and then on to us, 65.116.186.0/24, 65.121.8.0/23. The Qwest networks are the ones that I am having problems reaching hosts from or getting to from other networks. [...]
It's a bit of a long shot and difficult to see, but when I see natural C blocks without problems and natural A blocks with, I tend to suspect class-based filtering. This usually occurs if there's no less-specific route available, but there's 65.112.0.0/12 from Qwest covering both. This leaves only a few very obscure possibilities, so I wouldn't chase this except as a last resort. Peter E. Fry
On Wed, 2003-09-17 at 17:29, Peter E. Fry wrote:
Bret Baptist wrote: [...]
Right now I have visi.com as one provider (AS8015), and Qwest (AS3908) as the other. When I look at the as-paths for my netblocks the ones from visi.com look fine, 208.42.20.0/23 and 208.42.104.0/23, the ones from Qwest go through visi.com and then on to us, 65.116.186.0/24, 65.121.8.0/23. The Qwest networks are the ones that I am having problems reaching hosts from or getting to from other networks. [...]
It's a bit of a long shot and difficult to see, but when I see natural C blocks without problems and natural A blocks with, I tend to suspect class-based filtering. This usually occurs if there's no less-specific route available, but there's 65.112.0.0/12 from Qwest covering both. This leaves only a few very obscure possibilities, so I wouldn't chase this except as a last resort.
Peter E. Fry
I did a couple quick RADB queries, and I find no object for as AS30309. In addition there are no objects for the VISI-assigned blocks you mentioned, even with a shorter prefix length. I would strongly recommend a visit to WWW.ALTDB.NET if you already know how to update an IRRd database via email templates; or if not, pay your $500 to MERIT and use WWW.RADB.NET instead. Personally, I have used both ALTDB and RADB, and while it's obvious that "you get what you pay for", and no one should complain if they don't like the free ALTDB service, I have been very pleased with MERIT's responsiveness. -- Jeff S Wheeler
participants (4)
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Bret Baptist -
Iljitsch van Beijnum -
Jeff S Wheeler -
Peter E. Fry