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RE: Multiple DSLs, and switching incoming route upon failure?

Customers who purchase T1/T3 service generate more revenue for the ISP, and
although the difference may not justify the administrative overhead of
adding a BGP customer, most do not request this.  Some organizations (BEST
Internet, before Verio gobbled them up, for example) charge an additional
fee for BGP.  They charged 500$/Mo.

Address space is also an issue.  You cannot announce blocks smaller than /24
into global BGP and expect the results you want.  Some networks are still
filtering announcements smaller than /19 within some ranges, SprintLink for
example, as they took steps years ago to counteract routing table growth,
and this remains a problem even as routers become more powerful and memory
gets cheaper.

I do not know how the 6BONE scenario would work.  It was a shot from the
hip, I'm sure you could do some research in this area, or perhaps someone
else subscribed to the list can tell us how the 6BONE interoperates with the
current IPv4.

If you had a colocated server on a reliable IP connection you could VPN
yourself a subnet from it over either of your two DSL routes.  This might be
sane but would cause you to incur a lot of bandwidth bills. :-)

- jsw

-----Original Message-----
From: Mike Fedyk [mailto:mikef@matchmail.com]On Behalf Of Mike Fedyk
Sent: Saturday, May 26, 2001 4:35 PM
To: Jeff S Wheeler
Cc: debian-isp@lists.debian.org; debian-firewall@lists.debian.org
Subject: Re: Multiple DSLs, and switching incoming route upon failure?

On Fri, May 25, 2001 at 11:29:46PM -0400, Jeff S Wheeler wrote:
> Are your DSL uplinks from different ISPs, or from the same IP provider?

They are different providers.

DSL 1 is 384k/1.5m adsl at pacbell

dsl2 is 768k sdsl landmark (lmki)

> they are differing providers, there is no way you can feasably implement
> BGP.  If they are redundant paths to the same ISP you could ask them to

What do t1 and t3 customers do?  Is the only criteria for "feasibility" a
need for more IPs?

> issue you a reserved ASN (65512 - 65535) and announce your /28 into their
> network via ebgp sessions.  That makes a lot of assumptions about software
> support on your router(s), and of their willingness to accomodate you, of
> course.

I could get a second link to pacbell, but sometimes their entire network
gets unstable, and I would still need a second provider.  Doing the same
with the other provider would require four links, and still wouldn't fix the
problem if one ISP crashing completely.

> Realistically, you aren't going to make this happen.  Perhaps you could
> participate in something like the 6BONE, or simply colocate your obviously
> mission-critical services at your ISP.

Hmm, I wonder how exactly this would work with the 6BONE.  Can you get
traffic from ipv4 into the 6BONE from the "normal" internet?  How would I be

I probably wouldn't choose my ISP then, I'd choose a company that connects
to several ISPs, and that'll be more expensive. :(

> - jsw


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