This is what stops me from advertising blocks which I don't own. So if I became an ISP for a multi-homed business, and they had their own IPs, I'd have to contact both of my upstreams, Windstream and AT&T in order to have them route traffic in to this customer.
I think I get that part. But we already have an AT&T circuit. AT&T are already advertising ALL of our IPs. Surely anything that they advertise is reachable through them is going to come in our AT&T circuit? What I don't understand is how does Windstream advertising our IPs to AT&T help traffic to come in through Windstream? Surely any traffic that gets to AT&T's AS# will come in via our AT&T circuit? Since I'm shutting off the AT&T circuit anyway, and since these blocks are apparently being advertised now via Level 3, they should be reachable if I stop the BGP advertisements via AT&T, right? So perhaps there's no need for me to wait, and I should stop advertising them via BGP to AT&T, and go ahead and start re-numbering to the new IPs? On Fri, Jan 27, 2012 at 11:04 AM, Justin Wilson <[email protected]> wrote: > If they are following proper protocols you have to tell your upstream > what netblocks you are going to advertise to them, they verify this and > write route-maps/filters to allow this through. They then contact their > upstream and tell them the same thing. Repeat this up the chain. It's > one of the very few protections BGP has. > > Justin > > -----Original Message----- > From: Roger Howard <[email protected]> > Reply-To: <[email protected]>, WISPA General List <[email protected]> > Date: Fri, 27 Jan 2012 10:56:34 -0600 > To: <[email protected]> > Subject: Re: [WISPA] Advertising ARIN IPs via BGP > >>This is the way it looked to me, too. I just asked the guy at >>Windstream who is dealing with it. He said... >> >>"Windstream has two Tier 1 providers, Level 3 and AT & T . This allows >>us to have two separate drains to the internet backbone. These two >>providers have two separate processes for setting up the BGP sessions. >> The level 3 has been completed and we are still waiting on the AT & T >>piece to be completed." >> >>That just seems really odd to me. Surely they peer with dozens of big >>providers? Do I know nothing about the way BGP works? (which is quite >>possible). >> >>http://bgp.he.net/AS7029#_graph4 >> >>Also, we have an AT&T circuit, running BGP. Surely anything going to >>AT&T's AS# would come in via our AT&T circuit anyway. So how does >>Windstream advertising our block out via AT&T help bring traffic in >>via our Windstream circuit? And by the way, our old IP blocks which >>were handed to us by AT&T, are working fine and the majority of >>traffic is coming in via windstream to those. So whatever they are >>doing apparently works. Just seems really strange. >> >>On Thu, Jan 26, 2012 at 11:23 PM, Andrew W. Smith >><[email protected]> wrote: >>> >>> This should have nothing to do with AT&T. It sounds like Windstream has >>> incorrectly assumed that you are trying to announce something >>> owned/controlled by AT&T, or did you also ask them to allow your AT&T >>>/24s >>> through as well? If so, you might be able to get them to allow the ARIN >>>/21 >>> before processing the AT&T /24s. >>> >>> Perhaps forwarding them the results of an ARIN whois showing you fully >>>in >>> control of that prefix could help? >>> >>> Sorry I couldn't help more than confirming that it doesn't appear that >>> you've set anything up incorrectly with AT&T. >>> >>> >>> On 1/26/2012 9:00 PM, Roger Howard wrote: >>>> >>>> Two months ago, we received a /21 direct allocation of IPv4 addresses >>>>from >>>> ARIN. >>>> >>>> We have two geographically diverse upstream providers. One is AT&T. >>>> The other is Windstream. >>>> >>>> The Windstream circuit is considerably cheaper per meg, than the AT&T >>>> circuit. We are wanting to do away with AT&T. >>>> >>>> After receiving the IP allocation, we added it to our BGP configs, and >>>> contacted AT&T and Windstream to have the block advertised out to the >>>> Internet. AT&T got it dealt with within a few days and traffic to >>>> those IPs started flowing in. Windstream we have been fighting with >>>> for two+ months to get it done. >>>> >>>> It's costing us thousands of dollars per month, since we can't do away >>>> with the AT&T circuit until Windstream bring traffic in via their >>>> circuit to these IPs. >>>> >>>> Windstream say they are awaiting on AT&T in order to be able to >>>> advertise them. Can anyone explain to me why this could be the case? >>>> What does AT&T have to do with weather I can advertise an IP block via >>>> windstream or not? >>>> >>>> Thanks, >>>> Roger >>>> >>>> >>>> >>>> >>>>------------------------------------------------------------------------ >>>>-------- >>>> WISPA Wants You! 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