I've never heard of this practice either. An ISP will generally advertise his own
address space or PI space.
Never that belonging to another provider. Which AS are you supposed to use to
originate the addresses from?
Do you use a private AS number and strip it off upstream?
Dave Humphrey
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
[EMAIL PROTECTED]
Sent: 10 October 2000 15:00
To: [EMAIL PROTECTED]
Subject: Re: Verizon BGP
Elver, you obviuosly do not work at UUNET or you are not aware of your
company's BGP policies. I've set up multihoming at customer sites before
with UUNET and other ISP's
In my opinion if an ISP will not allow you to advertise another ISP's
address space for the purpose of multi-homing then use another ISP
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Brian,
>
> At UUNet we DO NOT advertise other ISPs IPs. We will advertise the
> customer's IPs if they own them (acquired from Arin, as mentioned by
Jason).
> By the way, Jason's explanation looks accurate.
>
> Elver
>
> -----Original Message-----
> From: Brian [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, October 10, 2000 12:15 AM
> To: Jason T. Carnevale
> Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: Verizon BGP
>
>
> On Mon, 9 Oct 2000, Jason T. Carnevale wrote:
>
> > The problem is not that Verizon can not advertise another providers IP
> > space it is that Venison by policy DOES NOT route other provider's IP
> > space. What is trying to be accomplished here is that Jin Tam is
> > trying to dual home his site, which is normal. Verizon requires that a
> > customer get their own IP space from Arin to do this. Verizon is well
> > aware of the longest match rule, but to route one ISPs address space
> > to multiple ISPs, (even if it is a more specific route) is asking for
> > global routing problems, which is why Verizon and other providers do
> > not allow this. You will also find that large ISPs do not except BGP
>
> not true, just about any major backbone provider will do this for you.
>
> > routes more specific than /21. I would refer to Internet Routing
>
> some large ISP's yes. Most large NSP's no. Who am I talking
> about? Well, lets say you have a /24 from a provider, and want it
> announced from your new provider.........who will do this for you? At
> least: UUnet, Qwest, Global Crossing, ATT, Sprint, Cable and
> Wireless.....
>
> A large ISP shouldn't care, if the case is legit.........I mean, if a
> customer comes to you, and needs his /24 dual homed for redundancy, help
> him out. If you don't someone else will. Now I am not saying lets all
> get together and dump on the global table, but its not fair that companies
> like UUnet for example, blatently leak MASSIVE routes into the global
> table, routes that don't need to be there at all, routes that accomplish
> nothing (specifics of a larger UUnet aggregate to a single homed UUnet
> customer). I mean, you have to make a buck too. If UUnet cleaned up its
> routes alone, it would reduce the GLOBAL table by about 1/2%. A single
> company........reducing the memory consumption of every global router in
> the world, by doing nothing more than cleaning up its routes......that
> would equate to actual dollars saved.........
>
> Sorry for the rant. Bottom line, if an NSP won't announce your /24, go
> somewhere else that will.........there are plenty of options.......and my
> god, most of them are better options than verizon.
>
>
> > Architectures for more information on setting up a dual homed BGP
> > session with your ISP. I also must state that people that respond to
> > these types of posts should not assume all the facts are presented by
> > the poster and with that in mind should not assume that the parties
> > involved are high school idiots. Just my 2 cents.
>
> well.........I just don't think the point is valid. If Verizon announces
> the more specific route.........what has happened? One entry has been
> added to the table. If the user gets there own space, and verizon
> announces, what has happened? One entry has been added to the
> table.......Now I know, that more than likely a user dual homing is going
> to have a half dozen or more specifics, which could be replaced by a
> single ARIN allocation. But does verizon take that into consideration? I
> mean, its possible your other provider did actually give you a /21 for
> example.........and that your space is contigious, and that by going to
> ARIN you save the world nothing.
>
> Also, what do you mean exactly that to route ones ISP space to another ISP
> can cause global routing problems? I mean, so long as its done properly
> you should be ok, this is a design consideration of BGP.
>
> Once again, sorry for the long rant.
>
> Brian
>
>
> >
> > -Jason
> >
> >
> >
> >
> >
> > On Mon, 9 Oct 2000, Jin Tam wrote:
> >
> > > Does anyone here peer with Verizon or work for the NOC. These guys are
> >
> > > telling me that I can't advertise an address block that doesn't belong
> to
> >
> > > them. So, what the hell is the point of a BGP session if I can't
> advertise
> >
> > > the same address through 2 or more providers. Also, I pointed my
> advertised
> >
> > > address at Null0 so that there would be a route in the table. They are
> >
> > > telling me that all the traffic will be dropped at the router. I had
to
> >
> > well it would, except that:
> >
> > 1. you are no doubt pointing an aggregate to null0, and the actual
routes
> >
> > which have meaning are more specific.
> >
> > 2. you are using a high administrative distance on that route
> >
> > > explain to their networking team about the longest match rule. Are
these
> >
> > > guys hiring high school grads for the NOC team?
> >
> > >
> >
> > > **NOTE: New CCNA/CCDA List has been formed. For more information go to
> >
> > > http://www.groupstudy.com/list/Associates.html
> >
> > > _________________________________
> >
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> >
> > >
> >
> > -----------------------------------------------
> >
> > Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
> >
> > Network Administrator
> >
> > ShreveNet Inc. (ASN 11881)
> >
> > **NOTE: New CCNA/CCDA List has been formed. For more information go to
> >
> > http://www.groupstudy.com/list/Associates.html
> >
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> >
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> >
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> >
> >
> >
> >
>
> -----------------------------------------------
> Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
> Network Administrator
> ShreveNet Inc. (ASN 11881)
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
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