From: Larson, Chris (CLarson@usaid.gov)
Date: Tue Nov 12 2002 - 12:46:07 GMT-3
Although most ISP's will accept the /24 it is unlikely that they propogate
it outside of their own AS if the IP block you have was provided by the ISP.
In that case they will accept /24 but will usually aggregate it to neighbors
outside of their own AS.
> -----Original Message-----
> From: Paul Jin [SMTP:pauljin@yahoo.com]
> Sent: Monday, November 11, 2002 8:05 PM
> To: MADMAN; Hamele Kassa
> Cc: Brian T. Albert; ccielab@groupstudy.com
> Subject: Re: BGP & multihoming
>
> I cannot remember who it was for sure, but I had a situation where I got
> for
> a customer of ours, to advertise a customer owned /24 to ATT and they had
> no problems.
>
> Everything went fine, and a week or two later, I got a call from the
> customer saying
> there is a particular web site that the executive members needed to get to
> but somehow they could not since the change over to ATT.
>
> What we found out was the fact that although ATT took in the /24 prefix
> and readvertised it, there was an ISP few hops down that did not accept
> /24. and the
> web server that the customer needed to get to was behind that ISP.
>
> But I cannot remember who it was, and this was back in early part of 2001.
>
> Has anyone had any similar experience?
>
> - Paul
>
> MADMAN <dave@interprise.com> wrote:I keep seeing people refer to this /19
> as the smallest aggregate that
> will be accepted by a provider though I have yet to meet this provider.
> I have set up several customers with dual home full routes and they
> announce a single /24 network or maybe a couple but very few have /19 or
> better. The providers I have worked with that accepted the /24 include
> Qwest, MCI, Sprint, Onvoy, and AT&T come to mind.
>
> Dave
>
> Hamele Kassa wrote:
> >
> > Brian,
> >
> > You do not need to secure your own registered address/es(your network
> has to
> > be bigger than /19 space to qualify). The IP address/es assigned to you
> > from your providers (/24 or shorter address space) will work for you as
> > long as you are running BGP(no longer prefix than /24). However you need
> to
> > secure and AS from ARIN(if you are multihomed you will qualify).
> >
> > I hope this helps.
> >
> > HK
> >
> > ----- Original Message -----
> > From: "Brian T. Albert"
>
> > To: "MADMAN"
> > Cc:
> > Sent: Sunday, November 10, 2002 10:51 AM
> > Subject: RE: BGP & multihoming
> >
> > > When you say "your own registered address/es", do you mean prefixes
> > assigned
> > > to you from your 2 providers or obtained from another authority? What
> > other
> > > authority can assign you prefixes independent of you providers, and
> what
> > are
> > > the requirements to obtain them?
> > >
> > > BA
> > >
> > > -----Original Message-----
> > > From: MADMAN [mailto:dave@interprise.com]
> > > Sent: Saturday, November 09, 2002 9:12 PM
> > > To: Brian T. Albert
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: BGP & multihoming
> > >
> > >
> > >
> > > You don't need NAT if you have your own registered address/es. No
> > special
> > > config required, you simply announce your public address/es
> > >
> > > Dave
> > >
> > > "Brian T. Albert" wrote:
> > >
> > > > In the real world can BGP multihoming to 2 different providers be
> > > > accomplished without NAT for the internal networks? I have found
> some
> > > links
> > > > on CCO http://www.cisco.com/warp/public/459/BGP-PIX.htm that show
> how to
> > > do
> > > > it with NAT, but is it possible without. If so, can someone supply
> some
> > > > config examples or good links.
> > > >
> > > > Thanks
> > > >
> > > > Brian T. Albert
> > > > brian.albert@worldnet.att.net
> > >
> > > --
> > > David Madland
> > > CCIE# 2016
> > > Sr. Network Engineer
> > > Qwest Communications Inc.
> > > 612-664-3367
> > > dave@interprise.com
> > >
>
> --
> David Madland
> CCIE# 2016
> Sr. Network Engineer
> Qwest Communications
> 612-664-3367
>
> "You don't make the poor richer by making the rich poorer." --Winston
> Churchill
>
>
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