From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Aug 03 2007 - 05:25:28 ART
Authentication
On 8/2/07, Hyunseog Ryu <r.hyunseog@ieee.org> wrote:
>
> I think unique routing policy is the idea why running BGP protocol.
> Without unique routing protocol, why do you want to run BGP routing
> protocol?
> That's why every Friday I get BGP routing summary with in-consistent AS
> Origin report.
> And this will make hard to track whether BGP prefix in question is
> hijacked one or legitimate one.
>
> For your another comment, I don't have a problem to have public ASN and
> public IP prefix for BGP announcement if he/she has legitimate reason
> for it.
> I know some guys have multiple OC3c to basement for running servers and
> things like that.
> It can be research thing, or personal entertainment thing... :-)
> I know Scott Morris has toys in his basement, too. ^.^
>
> Hyun
>
> sheherezada@gmail.com wrote:
> > Not really necessary. You can use a private ASN even when multihoming
> > with two different providers and even if announcing some [provider
> > independent] prefixes. They will just strip your private ASN when
> > announcing your prefixes to the outside world.
> >
> > You need your public AS number only if you want to express a
> > particular routing policy, i.e. you do have a particular preference as
> > to which of the upstream providers should be used for incoming
> > traffic. Otherwise, there is absolutely no problem for the outside
> > world to see that the prefix appears to be originated from different
> > ASs.
> >
> > Mihai Dumitru
> > CCIE #16616
> >
> > P.S. And I know a person who had a public ASN and PI address space for
> > his own personal use - it's not me :)
> >
> >
> > On 7/29/07, Hyunseog Ryu <r.hyunseog@ieee.org> wrote:
> >
> >> Upstream providers will remove private AS number when they readvertise
> >> to other ISPs.
> >> So natually if you have multi-homed to multiple ISPs, the route will be
> >> appeared as inconsistent ORIGIN AS, which will not appeared as valid
> >> route from RFC viewpoint.
> >> According to RFC - I don't remember which -, it should be originated
> >> from single AS number.
> >> Also, customer who uses Private ASN with multiple upstream providers
> can
> >> NOT implement consistent routing policy for that matter.
> >> So multihomed customer with private ASN is not recommended for multiple
> >> providers upstream connection.
> >> If customer have multiple connections with SAME providers, they may use
> >> private ASN for load sharing purpose.
> >>
> >> Hyun
> >>
> >>
> >> Gregory Gombas wrote:
> >>
> >>> What are you losing by using a private ASN? You can still advertise
> >>> your own dedicated IP address space via both providers can't you? Your
> >>> ISP's simply needs to remove that private AS when passing the update
> >>> to other ISP's...
> >>>
> >>> Am I missing something here?
> >>>
> >>> On 7/29/07, Herbert Maosa <asawilunda@googlemail.com> wrote:
> >>>
> >>>
> >>>> If you dont have your own ASN, you will most likely have to use a
> private
> >>>> ASN to connect to the two ISPs. Remember that if you use the ISPs ASN
> then
> >>>> you are an extension of that ISP. Using the private ASN in this case
> will
> >>>> permit you to be totally provider independent.
> >>>>
> >>>> regards,
> >>>>
> >>>> Herbert.
> >>>>
> >>>>
> >>>> On 7/29/07, Gregory Gombas <ggombas@gmail.com> wrote:
> >>>>
> >>>>
> >>>>> When connecting to the internet via two different ISP's, why is it
> >>>>> necessary to have a unique AS?
> >>>>>
> >>>>> What if you simply configured your BGP router with the same AS
> number
> >>>>> as one of your ISP's?
> >>>>>
> >>>>> Considering there are only 64511 unique AS numbers, I assume that
> most
> >>>>> if not all the AS numbers are already taken. What do companies do in
> >>>>> the case they cannot get their own AS number and need to multihome?
> >>>>>
> >>>>> Thanks,
> >>>>> Greg
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> _______________________________________________________________________
> >>>>
> >>>>
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> >>>>>
> >>>>>
> >>>>>
> >>>> --
> >>>> Kindest regards,
> >>>> hm
> >>>>
> >>>>
> >>>
> _______________________________________________________________________
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> >>>
> >> _______________________________________________________________________
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> >>
> >
> > _______________________________________________________________________
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>
> _______________________________________________________________________
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 www.Net-WorkBooks.com
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