From: Guyler, Rik (rguyler@shp-dayton.org)
Date: Wed Aug 01 2007 - 16:39:30 ART
I'm in the middle of evaluating this very topic right now in fact. We
already own a /23 so I don't have to go through the pain of requesting my
address block but the AS request through ARIN looks to be pretty
straightforward. According to their site, you only have to state that you
are multihomed or will be within 30 days with 2 different providers. It
also appears that the $500 AS registration fee is a one-time purchase and
not an annual cost.
Considering the benefits of this type of setup, such as VPN redundancy, I
can't find a better solution than this. We have a pair of F5
LinkControllers, which can handle load-balancing and path selection but I
lose VPN redundancy unless I want to force everything through NAT, which
would be bad IMHO. ;-)
My ISP connections are not equal in bandwidth so I plan to do some AS path
prepending (a few times) on the slower link and make more of a
primary/secondary setup than a more typical equal-cost multihomed network.
HSRP with tracking on my side of the BGP routers will handle the failover if
I should lose my primary router or ISP connection.
Rik
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Gary
Duncanson
Sent: Tuesday, July 31, 2007 5:23 AM
To: Scott Morris
Cc: ccielab@groupstudy.com; ggombas@gmail.com
Subject: Re: Unique AS number when connecting to two different ISP's?
Yes it's quite a process. I set up a LIR (Local Internet Registry) through
RIP in 2001. There were numerous documents to provide to RIPE and approval
stages to clear on the technical and business case side of things before the
/20 was assigned to my employer. The whole thing took a few months to
complete. It was the same for the AS approval. I also attended the RIPE
administrator course for new LIRs. The fees were not small. For multihoming
I worked hand in glove with the upstream guys UUNET to set up multihoming
for site failover with a view to using a second provider later on. Happy
days.
----- Original Message -----
From: "Scott Morris" <smorris@ipexpert.com>
To: "'Gregory Gombas'" <ggombas@gmail.com>; <smorris@ipexpert.com>
Cc: "'Group study'" <ccielab@groupstudy.com>
Sent: Tuesday, July 31, 2007 12:35 AM
Subject: RE: Unique AS number when connecting to two different ISP's?
> Most companies don't multihome. Among those that do multihome, most do it
> with a single provider in which case other protocols (including static or
> running MLPPP) offer perfectly acceptable load balancing.
>
> Larger companies may have different needs, but they likely have their own
> address space already, or can afford getting some (there are fees, many,
> many, evil fees).
>
> If you are trying to influence an upstream's behavior, more often just
> playing nice with their NOC staff will get you exactly what you need to
> have
> happen without complicating everyone's life through BGP!
>
> Nowdays, you actually have to justify WHY you need an AS number before
> you'll get one. It's not just paying $500 a year for it.
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI-M/JNCI-J
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
> A Cisco Learning Partner - We Accept Learning Credits!
>
> smorris@ipexpert.com
>
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> http://www.ipexpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Gregory Gombas
> Sent: Monday, July 30, 2007 5:23 PM
> To: smorris@ipexpert.com
> Cc: Group study
> Subject: Re: Unique AS number when connecting to two different ISP's?
>
> Thanks Scott,
>
> Is this what smaller companies typically do?
> I guess AS path prepending is out of the question considering your service
> providers will remove the private AS anyway?
>
> And finally, with millions of companie out there, I'm shocked that they
> haven't run out of AS numbers already. What are all these companies doing?
>
> On 7/29/07, Scott Morris <smorris@ipexpert.com> wrote:
>> Heheheh.. In the event of your multihoming, I think your upstream may
>> be
> a
>> little upset to know that you are impersonating them and only
>> advertising a small set of routes (e.g. not wanting to be a transit
> path!).
>>
>> So very often we'll have private AS's to use for purposes like this
>> where you want to run BGP, but are not multihoming, or simply that you
>> don't have provider independent space and even if you are multihoming
>> you aren't really advertising anything.
>>
>> If you DO have something to advertise, then you need an AS number. I
>> believe they're only on 49000 something for assignments, so there's
>> still room to grow.
>>
>> At the same time, they're just wrapping up the 4-byte AS number
>> extensions, so no fear of running out now!
>>
>> But with the interconnected world of BGP, if you truly have a need to
>> run BGP, then you most likely will need your own AS number to do so.
>> Otherwise, work with your ISP for private AS assignment, but don't
>> impersonate them, they will likely not find the humor in it!
>>
>>
>> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
>> JNCIE #153, CISSP, et al.
>> CCSI/JNCI-M/JNCI-J
>> VP - Technical Training - IPexpert, Inc.
>> IPexpert Sr. Technical Instructor
>>
>> A Cisco Learning Partner - We Accept Learning Credits!
>>
>> smorris@ipexpert.com
>>
>> Telephone: +1.810.326.1444
>> Fax: +1.810.454.0130
>> http://www.ipexpert.com
>>
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>> Of Gregory Gombas
>> Sent: Sunday, July 29, 2007 2:05 PM
>> To: Group study
>> Subject: Unique AS number when connecting to two different ISP's?
>>
>> 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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